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IX/22               Einstein extended deep survey         (Primini+, 1991)

The CfA Eisntein observatory extended deep X-ray survey Primini F.A., Murray S.S., Huchra J., Schild R., Burg R., Giacconi R. <Astrophys. J. 374, 440 (1991)> =1991ApJ...374..440P
ADC_Keywords: QSOs ; X-ray sources Mission_Name: Einstein Keywords: quasars - X-ray: sources Description: The Einstein Deep Survey program (EDS) consists of very deep X-ray exposures in selected regions of the sky at high galactic latitude. The main purposes of the survey are to investigate the nature of the extragalactic X-ray background through direct source counts at very low flux levels and to study the nature of the very faint X-ray sources which comprise a significant fraction, if not all, of the soft X-ray background. The survey includes 9 IPC observations and 34 HRI observations, which, in general, cover the central 32'x32' regions of the IPC fields. In total, 178 IPC sources and 202 HRI sources were detected above thresholds set to allow ∼1 false source per observation. Data from all IPC energy bands and all HRI detect cells are included. The data are largely the result of standard Einstein Rev. 1 HRI and Rev. 1B IPC reprocessing; however, minor corrections to IPC count rates, fluxes, and flux significances have been made to account for different column densities toward various fields and small systematic errors in the IPC analysis of count rates and significances for long exposures. For further details please refer to the paper referenced above. The HRI field parameters have been determined from standard processing and from other information contained in the HRI .SDF file. For information on HRI sources, see the table "hsrc.dat"; for information on individual IPC fields, see the table "ifield.dat". File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file targets.dat 40 43 EDS Target Information hfield.dat 110 34 EDS Field Parameters for HRI Observations hfluxes.dat 332 210 EDS Secondary HRI Source Parameters hsrc.dat 174 210 EDS HRI Source Positions and Count Rates hris_sep.dat 80 380 EDS Separations Between HRI Srcs in a Single Field ifield.dat 153 9 EDS IPC Field Parameters isrc.dat 271 178 EDS IPC Source Parameters ispec.dat 375 178 EDS Spectral Parameters for IPC Sources icomp.dat 98 453 EDS IPC Source Component Parameters ipchri.dat 89 5861 EDS Separations Between IPC and HRI Sources ihsample.dat 15 45 EDS Cross-Reference of HRI and IPC Sources sample.dat 136 45 EDS IPC, HRI + Optical Data for 4.5Sigma IPC Sample optinfo.dat 45 25 EDS Optical Data for Srcs in the 4.5 Sigma Sample
See also: IX/23 : Einstein Observatory Source Catalog IX/24 : The Einstein Observatory High Resolution Imager Source List IX/25 : Einstein Observatory Imaging Proportional Counter (IPC) Parameters IX/26 : Einstein Observatory, Revision 1B. Processings IX/27 : Einstein Observatory Catalog (OCAT or Yellow Book) Byte-by-byte Description of file: targets.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Seqno Sequence number (G1) 8- 10 A3 --- detector Detector (IPC or HRI) 12- 13 I2 h RAh Right Ascension (B1950) (hour) 15- 16 I2 min RAm Right Ascension (B1950) (min) 18- 19 I2 s RAs Right Ascension (B1950) (sec) 21 A1 --- DE- Declination sign (B1950) 22- 23 I2 deg DEd Declination (B1950) (deg) 25- 26 I2 arcmin DEm Declination (B1950) (arcmin) 28- 29 I2 arcsec DEs Declination (B1950) (arcsec) 31- 40 F10.3 s exptime Exposure time (2)
Note (2): This column gives the net time, in seconds, for the processed image (uncorrected for deadtime effects).
Byte-by-byte Description of file: hfield.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Hseqno HRI Sequence Number (G1) 8- 17 F10.3 s ontime Exposure Time 19- 24 F6.3 ct globk Background in 12"x12" detect cell (in 9' circle) 26- 31 F6.3 ct detbk Background in 12"x12" detect cell (in 5' circle) 33- 39 F7.3 ct th12 Threshold counts for source detection (12"x12" cell) 41- 47 F7.3 ct th24 Threshold counts in 24"x24" cell 49- 55 F7.3 ct th36 Threshold counts in 36"x36" cell 57- 64 F8.3 ct th48 Threshold counts in 48"x48" cell 66- 73 F8.3 ct th72 Threshold counts in 72"x72" cell 75- 82 F8.3 ct th120 Threshold counts in 120"x120" cell 84- 85 I2 h RAh Right Ascension (B1950) (hour) (1) 87- 88 I2 min RAm Right Ascension (B1950) (min) 90- 91 I2 s RAs Right Ascension (B1950) (sec) 93 A1 --- DE- Declination sign (B1950) 94- 95 I2 deg DEd Declination (B1950) (deg) 97- 98 I2 arcmin DEm Declination (B1950) (arcmin) 100-101 I2 arcsec DEs Declination (B1950) (arcsec) 103-110 F8.3 deg nroll Nominal Roll Angle (G2)
Note (1): These columns give the nominal right ascension and declination (B1950) of the field. The nominal position is the center of the image which differs slightly from the center of the field of view due to aspect and boresight offsets.
Byte-by-byte Description of file: hfluxes.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Hseqno HRI sequence number (G1) 8- 9 I2 --- Hsrcno HRI source number (1) 11- 12 I2 ct cts0to3 Counts within 0-3" of source position 14- 16 I3 ct cts3to9 Counts within 3-9" of source position 18- 20 I3 ct cts9to18 Counts within 9-18" of source position 22- 26 F5.3 --- USProb Probability that the source is unresolved 27- 56 10I3 ct ctR Counts in annuli containing ∼10% of total src cts 57-106 10F5.1 arcsec radR Outer radii of the annular regions 107-166 10F6.3 ct/arcsec2 denR Photon densities in the annular regions 168-173 F6.3 ct/ks CR(S)PS Count rate for assumed soft thermal point source (2) 175-184 E10.5 mW/m2 FL(S)PS Corresponding flux 186-195 E10.5 ct/ks CR(H)PS C-rate for assumed hard thermal pt src (3) 197-206 E10.5 mW/m2 FL(H)PS Corresponding flux 208-212 F5.3 arcsec xtnt Best estimate of source extent 214-218 F5.2 ct/ks CR(S)XS C-rate for soft thermal source within estimated extent (2) 220-229 E10.5 mW/m2 FL(S)XS Corresponding flux 231-240 E10.5 ct/ks CR(H)XS Count rate for hard thermal source within estimated extent (3) 242-251 E10.5 mW/m2 FL(H)XS Corresponding flux 253-254 F2.0 arcsec ulxtnt Upper limit on source extent 256-260 F5.2 ct/ks CR(S)UXS Count rate for soft thermal source within upper limit extent (2) 262-271 E10.5 mW/m2 FL(S)UXS Corresponding flux 273-282 E10.5 ct/ks CR(H)UXS Count rate for hard thermal source within upper limit extent (3) 284-293 E10.5 mW/m2 FL(H)UXS Corresponding flux 295-296 F2.0 arcsec llxtnt Lower limit on source extent 298-302 F5.2 ct/ks CR(S)LXS Count rate for soft thermal source within lower limit extent (2) 304-313 E10.5 mW/m2 FL(S)LXS Corresponding flux 315-324 E10.5 ct/ks CR(H)LXS Count rate for hard thermal source within lower limit extent (3) 326-332 F7.3 mW/m2 FL(H)LXS Corresponding flux
Note (1): The 'Hsrcno' column gives the HRI source number within the field. Note (2): Assumed Thermal Bremmstrahlung spectrum at kT=0.3 keV Note (3): Assumed Thermal Bremmstrahlung spectrum at kT=3.0 keV
Byte-by-byte Description of file: hsrc.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Hseqno HRI Sequence Number (G1) 8- 9 I2 --- Hsrcno HRI Source Number (1) 11- 13 I3 arcsec csize Detection cell size 15- 22 F8.3 pix y Position in y 24- 31 F8.3 pix z Position in z 33- 36 F4.1 arcsec poserr Position error 38- 39 I2 h RAh Right Ascension (B1950) (hour) 41- 42 I2 min RAm Right Ascension (B1950) (min) 44- 45 I2 s RAs Right Ascension (B1950) (sec) 47 A1 --- DE- Declination sign (B1950) 48- 49 I2 deg DEd Declination (B1950) (deg) 51- 52 I2 arcmin DEm Declination (B1950) (arcmin) 54- 55 I2 arcsec DEs Declination (B1950) (arcsec) 57- 62 F6.3 ct/ks netcr Corrected Count Rate per 1000 sec 64- 68 F5.3 ct/ks e_netcr Error on Count Rate 70- 74 F5.0 ct bpcts Counts in detect cell centered at best position (2) 76- 80 F5.0 ct eqcts Counts in circle of equivalent area (2) 82- 85 F4.0 ct bp18cts Counts in standard 18" circle at best position (3) 87- 93 F7.3 ct bp18bg Background in 18" circle (3) 95- 99 F5.3 --- bp18scat Fraction of src cnts scattered out of 18" circle (3) 101-105 F5.3 --- vcorr Telescope vignetting correction at source position (4) 107-111 F5.3 --- dtfac Dead time correction factor (4) 113-117 F5.3 --- qec Detector quantum efficiency at source position (4) 119-127 F9.2 s exptime Exposure time at source position (5) 129-132 I4 ct xccts Counts in extended circle (6) 134-140 F7.2 ct xcbg Background in extended circle (6) 142-151 F10.7 ct xcscat Fraction of src cts scattered out of extended circle (6) 153-163 F11.7 arcsec xcrad Radius of extended circle (6) 165-174 F10.7 --- sizcor Source xtent correction factor for cts/ks (7)
Note (1): The 'Hsrcno' column gives the HRI source number within the field. Note (2): The number of counts in a detect cell centered at the best position for each HRI source is given in the 'bpcts' columns. In the 'eqcts' column, the number of counts in a circle of equivalent area is given. Note (3): Source parameters are also calculated for each source at its best position in a standard circle with a radius of 18". The 'bp18cts' column lists source counts in the 18" circle, and the 'bp18bg' lists the expected background value in this circle determined from the background in a 5' region about the target center, scaled by the circle size and the exposure at the source location. The 'bp18scat' column lists the fraction of total source counts scattered out of the 18" circle. Note (4): The 'vcorr' and 'dtfac' columns list corrections made to the observation time; 'vcorr' gives the telescope vignetting correction at the source position and 'dtfac' gives the dead time correction factor at the time of the observation. The 'qec' column gives the detector quantum efficiency at the source position. Note (5): This column gives the total exposure time, in seconds, at the source position. The exposure time is corrected for intervals lost due to unacceptable aspect solution, detector dead time, and other event screening. It may differ from the net time in the processed image if the source is not in the field of view for the entire observation. Note (6): These columns give information about extended sources. The number of counts in an extended circle (that circle which circumscribes all detect cells above threshold) is given in 'xccts'. The background in this extended circle is given by 'xcbg'. 'xcscat' gives the fraction of source counts scattered out of the extended circle; and 'xcrad' gives the radius of the extended circle in arcseconds. Note (7): This column give the size correction factor, 'sizcor', a parameter developed to adjust intensities for extended sources. Since Rev 1 did not attempt to provide estimates of count rates or fluxes of extended sources, we have developed a new parameter, sizcor, which is conceptually similar to the classical beam broadening correction used by radio astronomers when performing drift scans with single-dish telescopes. Sizcor serves to correct all intensity measurements (optimized for point sources) of resolved sources for the X-ray brightness which is outside of the detection box. 'sizcor' can be used with any intensity measurement (counts, count rate, or flux) to obtain an estimate for extended sources. For a more complete description of sizcor, see the table IX/23/source.dat.
Byte-by-byte Description of file: hris_sep.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Hseqno HRI sequence number (G1) 7 I1 --- H1srcno HRI source number (1) 9- 10 I2 arcsec H1cell Detection cell size 12- 19 F8.3 pix H1y Source y position 21- 28 F8.3 pix H1z Source z position 30- 32 F3.1 arcsec H1poserr Position uncertainty 34- 35 I2 --- H2srcno # of another source in same sequence detected with different cell size (1) 37- 39 I3 arcsec H2cell Detection cell size 41- 48 F8.3 pix H2y Second source y position 50- 57 F8.3 pix H2z Second source z position 59- 62 F4.1 arcsec H2poserr Second source position uncertainty 64- 71 F8.3 arcsec separation Separation between the two sources (2) 73- 79 F7.3 --- nsep Normalized separation (2)
Note (1): These columns give the HRI source numbers, within a given field, of two sources which were detected with different cell sizes. Note (2): The 'separation' column gives the pure separation between the two sources in arcseconds. The nsep column gives the normalized separation, defined to be the ratio of separation to total positional uncertainty. Total positional uncertainty is defined as the sum of individual positional uncertainties, with a systematic error of 3.5" added in quadrature to each individual uncertainty.
Byte-by-byte Description of file: ifield.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Iseqno IPC Sequence Number (G1) 7- 14 F8.2 s ontime Uncorrected exposure time (1) 16- 23 F8.2 s ltime Corrected livetime (2) 25- 29 F5.3 ct/pix2 sfbk Field average background for soft band (3) 31- 35 F5.3 ct/pix2 hfbk Field average background for hard band (3) 37- 41 F5.3 ct/pix2 bfbk Field average background for broad band (3) 43- 44 I2 h RAh Right Ascension (B1950) (hour) 46- 47 I2 min RAm Right Ascension (B1950) (min) 49- 50 I2 s RAs Right Ascension (B1950) (sec) 52 A1 --- DE- Declination sign (B1950) 53- 54 I2 deg DEd Declination (B1950) (deg) 56- 57 I2 arcmin DEm Declination (B1950) (arcmin) 59- 60 I2 arcsec DEs Declination (B1950) (arcsec) 62- 68 F7.2 deg nroll Nominal Roll Angle (G2) 70- 77 E8.4 cm-2 nH Neutral Hydrogen Column Density (4) 79- 87 E9.4 mJ/m2/ct sr2f Flux conversion factor for soft band (5) 89- 97 E9.4 mJ/m2/ct hr2f Flux conversion factor for hard band (5) 99-107 E9.4 mJ/m2/ct br2f Flux conversion factor for broad band (5) 109-113 F5.3 --- alpha Backgrnd map normaliz. factor for DSMAP (6) 115-124 E10.4 --- sbeta BG map normaliz. factor for soft band BEMAP (6) 126-135 E10.4 --- hbeta BG map normaliz. factor for hard band BEMAP (6) 137-146 E10.4 --- bbeta BG map norm. factor for broad band BEMAP (6) 148-153 F6.3 --- bal Time-averaged BAL for the sequence (7)
Note (1): The 'ontime' column gives the total uncorrected exposure time, in seconds. Note (2): The 'ltime' column gives the corrected livetime (in seconds); this has been corrected for intervals lost because of Earth occultation, passage through the South Atlantic Anomaly, unacceptable aspect solution, and detector dead time. It is the net time, in seconds, during which the detectors gathered data. Note (3): These columns give the field-averaged background, in counts/square pixel, for the soft (0.16-0.8 keV), hard (0.8-3.5 keV), and broad (0.16-3.5 keV) bands. The background has been obtained from an annulus between 8 and 15 arcminutes about the target center. Note (4): This column gives the column density of neutral hydrogen in atoms per cm2, integrated along the line of sight through our Galaxy in the direction of the field center of the observation. Specified in exponential notation, 'nH' values are obtained from sky surveys of neutral hydrogen using 21 cm radio observations. The data are from the Bell Lab survey of Stark et al., private communication. Note (5): These columns give the conversion factor from count rate (cts/sec) to fluxes (ergs/cm**2/sec) for the soft, hard, and broad bands. Note (6): These quantities describe the relative contributions of the two template background maps in the background map generated for the image. The DSMAP template is generated by summing several deep survey exposures. In constructing the image background map, the DSMAP template is normalized by the ratio of image livetime to DSMAP livetime. This normalization factor, 'alpha', is the same for all energy bands. The BEMAP template is generated by summing several exposures of the bright earth. In constructing the image background map, the BEMAP template is normalized so that the total counts in the image (with sources subtracted) and the total counts in the sum of the normalized DSMAP and BEMAP are the same. The BEMAP normalization factors, 'sbeta', 'hbeta', and 'bbeta', thus represent the ratio of BEMAP counts in the image to counts in the BEMAP template. They differ in the three energy bands. For more information on the construction of the image background map from the DSMAP and BEMAP templates, see Primini, et al. 1991ApJ...374..440P. Note (7): This column contains the time-averaged gain of the instrument for the observation.
Byte-by-byte Description of file: isrc.dat
Bytes Format Units Label Explanations
2- 5 A4 --- Iseqno IPC sequence number (G1) 7- 8 I2 --- Isrcno IPC source number in sequence (1) 10- 13 I4 --- reco Rib and Edge Code (2) 15- 16 A2 --- pcod Detection method and band (3) 18 I1 --- poscode Position code (1 = within central 32'x32') (4) 20- 21 I2 arcsec poserr Position uncertainty 23- 24 I2 h RAh Right Ascension (B1950) (hour) 26- 27 I2 min RAm Right Ascension (B1950) (min) 29- 30 I2 s RAs Right Ascension (B1950) (sec) 32 A1 --- DE- Declination sign (B1950) 33- 34 I2 deg DEd Declination (B1950) (deg) 36- 37 I2 arcmin DEm Declination (B1950) (arcmin) 39- 40 I2 arcsec DEs Declination (B1950) (arcsec) 42- 47 F6.3 arcmin theta Off-axis angle (5) 49- 53 F5.3 --- vcorr Rev. 1B vignetting correction (6) 55- 57 I3 ct Scell Soft counts in detect cell at source posn (7) 59- 62 F4.1 ct e_Scell Error in detect cell counts in soft band (7) 64- 66 I3 ct Hcell Hard counts in detect cell at source posn (7) 68- 71 F4.1 ct e_Hcell Error in detect cell counts in hard band (7) 73- 76 I4 ct Bcell Broad counts in detect cell at source posn (7) 78- 81 F4.1 ct e_Bcell Error in detect cell counts in broad band (7) 83- 87 F5.1 ct Scellbk Background in detect cell in soft band (8) 89- 90 I2 ct e_Scellbk Error in detect cell bg in soft band (8) 92- 97 F6.2 ct Hcellbk Background in detect cell in hard band (8) 99-102 F4.2 ct e_Hcellbk Error in detect cell bg in hard band (8) 104-109 F6.2 ct Bcellbk Background in detect cell in broad band (8) 111-112 I2 ct e_Bcellbk Error in detect cell bg in broad band (8) 114-124 E11.5 ct/s Sccr Soft band corrected count rate (9) 126-135 E10.5 ct/s e_Sccr Error in soft band corrected count rate (9) 137-147 E11.5 ct/s Hccr Hard band corrected count rate (9) 149-158 E10.5 ct/s e_Hccr Error in hard band corrected count rate (9) 160-169 E10.5 ct/s Bccr Broad band corrected count rate (9) 171-180 E10.5 ct/s e_Bccr Error in broad band corrected count rate (9) 182-192 E11.5 mW/m2 Sflux Soft band flux (10) 194-203 E10.5 mW/m2 e_Sflux Error in soft band flux (10) 205-215 E11.5 mW/m2 Hflux Hard band flux (10) 217-226 E10.5 mW/m2 e_Hflux Error in hard band flux (10) 228-237 E10.5 mW/m2 Bflux Broad band flux (10) 239-248 E10.5 mW/m2 e_Bflux Error in broad band flux (10) 250-254 F5.2 --- Scorrsnr Soft band signal-to-noise ratio 256-260 F5.2 --- Hcorrsnr Hard band signal-to-noise ratio 262-266 F5.2 --- Bcorrsnr Broad band signal-to-noise ratio 268-271 F4.2 --- f Deep survey count rate correction (11)
Note (1): The 'srcno' column gives the IPC source number within the field. Note (2): This column gives the ribs and edges code ('reco'), a numeric flag with nonzero values indicating that the detection cell (and/or frame defined for "local detect") falls near or on a rib shadow or detector edge. The code is formed by concatenating a pair of two-digit numbers: the first (thousands and hundreds columns) gives the number (up to 16) of frame subcells potentially shadowed by the ribs or masked-field edge; the second (tens and units columns) gives the number of subcells (up to 09) within the detect box which are potentially shadowed. Note (3): The 'pcod' column gives the detection method and band which describes the origin of the position for each IPC source detected during standard Rev 1B processing. There are six combinations which describe the detection method and band for each IPC source detected; these combinations are given by a two-digit code, with the first digit representing the detection method (L for L detect, or M for M detect), and the second digit representing the spectral band used in detection (S for soft, H for hard, or B for broad). 'pcod' describes from which method/band combination the position is given; it is the first available one from the following prioritized order: MH, MB, MS, LH, LB, LS. Note (4): The 'poscode' column gives the position code for each source. The position code will have bit 0 (the least significant bit) set if the source is within the central 32'x32' of the field. It will have bit 1 set if 'reco' > 0 (see above for description of 'reco'). Note (5): This is the distance of the source from the pointing position of the observation. Note (6): This column gives the Rev 1B vignetting correction and is used in determining the corrected count rates. Note (7): The 'Scell' and 'e_Scell' columns give the number of source counts in the detect cell and the corresponding error at the source position in the soft band (0.16-0.8 keV); 'Hcell' and 'e_Hcell' give these quantities for the hard band (0.8-3.5 keV); 'Bcell' and 'e_Bcell' give these quantities for the broad band (0.16-3.5 keV). Note (8): The 'Scellbk' and 'e_Scellbk' columns give the number of background counts and the corresponding error in the detect cell in the soft band. 'Hcellbk' and 'e_Hcellbk' give these quantities for the hard band; 'Bcellbk' and 'e_Bcellbk' give these quantities for the broad band. The background counts are determined either from counts in a region surrounding the detect cell (LDETECT) or from counts in the corresponding detect cell of the background map (MDETECT). In the latter case, the error in the background counts is assumed to be zero. Note (9): The 'Sccr' and 'e_Sccr' columns give the soft band corrected count rate (in counts/sec) and the corresponding error. 'Hccr' and 'e_Hccr' give these quantities for the hard band; 'Bccr' and 'e_Bccr' give these quantities for the broad band. In general, the corrected count rate is determined as follows: ccr = (cell-cellbk) * vcorr * CMS * CPRF / livetime vcorr is described above. CPRF corrects for source photons which fall outside the detect cell. Detect cell sizes are chosen so that CPRF=1.13 for all energy bands. CMS corrects for large angle scattering intrinsic in the HEAO-2 mirror. This factor is energy-dependent and has a value of 1.09 for the soft band and 1.18 for the hard and broad bands. For deep survey sources, additional minor count rate corrections may be necessary. These are described in the "f" column below. Note (10): The 'Sflux' and 'e_Sflux' columns give the soft band flux (in ergs/cm**2/s or mW/m2) and the corresponding error. 'Hflux' and 'e_Hflux' give these quantities for the hard band; 'Bflux' and 'e_Bflux' give these quantities for the broad band. Note (11): This column gives the deep survey count rate correction factor; this number will be 0 if the source was excluded from the DSMAP. Otherwise, it will be equal to the ratio of the livetime of the sequence number to the livetime of the DSMAP. This correction is necessary because the DSMAP templates used to construct background maps are generated from the deep survey observations themselves. Thus calculation of count rates for deep survey sources may be biased by inclusion of source counts in the background map. Correction for this bias is described in detail in Primini et al. 1991. (=1991ApJ...374..440P)
Byte-by-byte Description of file: ispec.dat
Bytes Format Units Label Explanations
2- 5 A4 --- Iseqno IPC sequence number (G1) 7- 8 I2 --- Isrcno IPC source no. within sequence (1) 10- 14 F5.0 pix2 Barea pixels Area of background region (2) 16- 20 F5.0 pix2 Sarea pixels Area of source region (2) 22- 31 F10.7 --- hr Hardness ratio (3) 33- 43 F11.7 --- E_hr Positive hardness ratio error (3) 45- 55 F11.7 --- e_hr Negative hardness ratio error (real) (3) 56-135 16F5.0 --- phbk Pulse height spectrum of background region (4) 136-215 16F5.0 --- pibk Pi spectrum of background region (5) 216-295 16F5.0 --- ph Pulse height spectrum of source (6) 296-375 16F5.0 --- pi Pi spectrum of source (7)
Note (1): This column gives the IPC source number within the field, for each IPC source detected in the Einstein Deep Survey. Note (2): These columns give the area, in square pixels, for the background region and the source region used to accumulate counts for the IP/RHA spectra. The background region is nominally a 5'-6'annulus around the source, with any other sources excluded. The source region is nominally a 3' circle around the source, with any other sources excluded. An IPC pixel is 8"x8". Note (3): These columns give the hardness ratio and its plus and minus error, from Rev1B processing. The hardness ratio for a source is defined as the ratio of the difference between the number of counts in the hard and soft bands to the sum of these quantities: counts(hard) - counts(soft) hr = --------------------------- counts(hard) + counts(soft) Note that the error values are assumed symmetric and are thus only approximate. Note (4): These columns give the pulse height spectrum of the background region for each of the 16 pha channels. Note (5): These columns give the pi spectrum of the background region for each of the 16 pi channels. Note (6): These columns give the pulse height spectrum of the source for each of the 16 pha channels. Note (7): These columns give the pi spectrum of the source for each of the 16 pi channels.
Byte-by-byte Description of file: icomp.dat
Bytes Format Units Label Explanations
1- 5 I5 --- Iseqno IPC sequence number (G1) 7- 8 I2 --- Isrcno IPC source number in sequence (1) 10- 11 A2 --- comp [LMBHS] Detection method and band (2) 13- 19 F7.3 pix ypix Source y position 21- 26 F6.3 pix e_ypix Error in y position 28- 34 F7.3 pix zpix Source z position 36- 41 F6.3 pix e_zpix Error in z position 43- 46 I4 ct cellcts Counts in detect cell centered at y,z (3) 48- 53 F6.3 ct e_cellcts Error in detect cell counts (3) 55- 61 F7.3 ct cellbk Background in detect cell (3) 63- 68 F6.3 ct e_cellbk Error in background (3) 70- 77 F8.3 ct netccts Net source counts in detect cell 79- 84 F6.3 ct e_netccts Error in net counts 86- 92 F7.3 ct thr Threshold counts in detect cell for source detection. 94- 98 F5.2 --- snr Count rate signal-to-noise ratio
Note (1): The 'Isrcno' column gives the IPC source number within the field. Note (2): This column gives a two-digit code which identifies the detection method and band for each IPC source. The two detection method codes are L and M, for LDETECT and MDETECT. The band will be identified by an S, H, or B (for soft, hard, or broad). Thus, a typical entry in this column might be MH for an MDETECT hard band detection. Note (3): The 'cellcts' and 'e_cellcts' columns give the counts and corresponding error in the detect cell centered at the given source position, y,z. Likewise, the 'cellbk' and 'e_cellbk' give the background counts and corresponding error in the source detect cell. The background counts are determined either from counts in a region surrounding the detect cell (LDETECT) or from counts in the corresponding detect cell of the background map (MDETECT). In the latter case, the error in the background counts is assumed to be zero.
Byte-by-byte Description of file: ipchri.dat
Bytes Format Units Label Explanations
2- 5 A4 --- Iseqno IPC sequence number (G1) 7- 8 I2 --- Isrcno IPC source number (1) 10- 11 I2 h RAh Right Ascension (B1950) (hour) 13- 14 I2 min RAm Right Ascension (B1950) (min) 16- 20 F5.2 s RAs Right Ascension (B1950) (sec) 22 A1 --- DE- Declination sign (B1950) 23- 24 I2 deg DEd Declination (B1950) (deg) 26- 27 I2 arcmin DEm Declination (B1950) (arcmin) 29- 32 F4.1 arcsec DEs Declination (B1950) (arcsec) 34- 35 I2 arcsec ipcperr IPC source position uncertainty (2) 37- 41 F5.2 --- ipchsnr IPC Hard band signal-to-noise ratio 43- 47 I5 --- Hseqno ?=0 HRI sequence number (G1) 49- 50 I2 --- Hsrcno ?=0 HRI source number 52- 53 I2 h RA(HRI)h HRI Right Ascension (B1950) (hour) 55- 56 I2 min RA(HRI)m HRI Right Ascension (B1950) (min) 58- 61 F4.1 s RA(HRI)s HRI Right Ascension (B1950) (sec) 63 A1 --- DE(HRI)- HRI Declination sign (B1950) 64- 65 I2 deg DE(HRI)d HRI Declination (B1950) (deg) 67- 68 I2 arcmin DE(HRI)m HRI Declination (B1950) (arcmin) 70- 71 I2 arcsec DE(HRI)s HRI Declination (B1950) (arcsec) 73- 76 F4.1 arcsec hriperr HRI source position uncertainty (3) 78- 83 F6.1 arcsec theta Separation between IPC and HRI sources (4) 85- 89 F5.1 --- nsep Normalized separation (4)
Note (1): These columns give the IPC sequence number and source number within that field for Einstein Deep Survey IPC sources. Note (2): This column gives the positional uncertainty, in arcseconds, of the given IPC source. Note (3): This column gives the positional uncertainty, in arcseconds, of the given HRI source. Note (4): 'theta' gives the separation between IPC and HRI sources detected in corresponding fields for each target in the Einstein Deep Survey. The 'nsep' column gives the normalized separation between IPC and HRI sources, defined to be the ratio of separation to sum of IPC and HRI positional uncertainties. A systematic uncertainty of 3.5" is added in quadrature to the HRI uncertainty before calculating nsep. The IPC position error also includes a systematic uncertainty, which depends on source position, and ranges from 25" to 45".
Byte-by-byte Description of file: ihsample.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Iseqno IPC sequence number (1) 6- 7 I2 --- Isrcno IPC source number (1) 9- 13 I5 --- Hseqno ?=0 HRI sequence number (2) 15 I1 --- Hsrcno ?=0 HRI source number of matching HRI source (2)
Note (1): These columns give the IPC sequence number and source number within that field for Einstein Deep Survey IPC sources greater than 4.5 sigma which also have a coincident HRI source detection. Note (2): These columns give the HRI sequence number and source number within that field for Einstein Deep Survey HRI sources which also have a coincident IPC source detection greater than 4.5 sigma. Coincidences are defined as an IPC-HRI pair with a normalized separation of two or less. The normalized separation is described as: IPC-HRI separation ------------------------------------ sum of IPC and HRI positional errors This threshold was determined empirically by examining the distribution of normalized separations for all IPC-HRI pairs.
Byte-by-byte Description of file: sample.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Iseqno IPC sequence number (G1) 6- 7 I2 --- Isrcno IPC source number (1) 9- 10 I2 h RAh Right Ascension (1950) (hour) 12- 13 I2 min RAm Right Ascension (1950) (min) 15- 16 I2 s RAs Right Ascension (1950) (sec) 18 A1 --- DE- Declination Sign (1950) 19- 20 I2 deg DEd Declination (1950) (deg) 22- 23 I2 arcmin DEm Declination (1950) (arcmin) 25- 26 I2 arcsec DEs Declination (1950) (arcsec) 28- 29 I2 arcsec Iposerr IPC position uncertainty 31- 37 F7.4 10-17W/m2 Iflux IPC source flux (*1.0E14) (2) 39- 44 F6.4 10-17W/m2 e_Iflux IPC flux error (*1.0E14) 46- 51 F6.3 --- Isnr IPC count rate signal-to-noise ratio 53- 57 I5 --- Hseqno ?=0 HRI sequence number (3) 59 I1 --- Hsrcno ?=0 HRI src # of HRI src (if any) that matches IPC src (3) 61- 63 I3 arcsec Hcell HRI detection cell size 65- 91 A27 --- Hpos HRI B1950 source position (sexag.) 93- 97 F5.2 arcsec e_Hpos HRI position uncertainty 99-104 F6.3 ct/ks Hrate HRI source count rate per 1000 s (4) 106-110 F5.3 ct/ks e_Hrate HRI rate error 112 A1 --- l_Vmag [> ] uncertainty in Vmag 114-117 F4.1 mag Vmag ? Optical visual magnitude 119 A1 --- l_fxfv [> ] uncertainty in fxfv 121-124 F4.1 --- fxfv ? Log of ratio of broad x-ray flux/optical flux (5) 126-129 F4.2 --- z ? OPT redshift 131-136 A6 --- ID Identification (6)
Note (1): This column gives the IPC source number within that field for Einstein Deep Survey IPC sources contained in the 4.5 sigma signal-to- noise-limited sample. Note (2): This column give the hard band IPC source flux in units of 10-14 ergs/cm2/s. Note (3): These columns give the HRI sequence number and source number within that field for Einstein Deep Survey HRI sources contained in the 4.5 sigma signal-to-noise-limited sample. Note that there may be more than one HRI detection for each IPC source. Note (4): These columns give the HRI count rate per 1000 sec and the corresponding error for each HRI source detected in the 4.5 sigma sample. The count rates have been corrected for vignetting, scattering, dead time, and detector efficiency. Note (5): This column gives the logarithm of the ratio of x-ray flux in the IPC broad band (0.16-3.5 keV) to the optical flux. Note (6): This column gives the optical identification for the IPC source. Current identifications include: Galaxy, Star, and QSO.
Byte-by-byte Description of file: optinfo.dat
Bytes Format Units Label Explanations
4- 7 I4 --- Iseqno IPC sequence number (G1) 13- 14 I2 --- Isrcno IPC source number (1) 16 A1 --- l_Vmag [> ] limit to the visual magnitude 18- 21 F4.1 mag Vmag ? Visual magnitude 23 A1 --- l_fxfv [> ] '>' when fxfv is a lower limit 25- 28 F4.1 --- fxfv ? Log of ratio of broad x-ray flux/optical flux (2) 32- 35 F4.2 --- z ? Redshift 39- 44 A6 --- ID Galaxy Identification (3)
Note (1): The source number within that field for Einstein Deep Survey IPC sources for which there is optical information. Note (2): This column gives the logarithm of the ratio of x-ray flux in the broad band (0.16-3.5 keV) to the optical flux. Note (3): This column gives the optical identification for the IPC source. Current identifications include: Galaxy, Star, and QSO.
Global Notes: Note (G1): The 'Seqno' column gives the Einstein Observatory sequence number, a two to five digit number which uniquely identifies the observation. The numbers were assigned sequentially at the time of proposal submission. Note (G2): The 'nroll' gives the angle which measures the roll of the spacecraft about the axis pointing towards the field center. It provides the angular orientation of the focal plane detectors with respect to the celestial coordinate grid. A positive value of the roll angle indicates a clockwise rotation of the (detector's projected) field when viewing the celestial sphere.
History: Prepared from the tables available at the "ADS Catalogue Service" (CfA, Harvard-Smithsonian Center for Astrophysics, Cambrigde MA)
(End) Patricio Ortiz [CDS] 20-Apr-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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