J/A+A/379/740 ESO Imaging Survey (EIS) (Arnouts+, 2001)
ESO imaging survey. Deep public survey: Multi-color optical data for the Chandra Deep Field South. Arnouts S., Vandame B., Benoist C., Groenewegen M.A.T., da Costa L., Schirmer M., Mignani R.P., Slijkhuis R. <Astron. Astrophys. 379, 740 (2001)> =2001A&A...379..740A
ADC_Keywords: Surveys ; Galaxies, photometry Keywords: catalogs - surveys - stars : general - galaxies : general Abstract: This paper presents multi-passband optical data obtained from observations of the Chandra Deep Field South (CDF-S), located at RA=03h32m, Dec=-27°48'. The observations were conducted at the ESO/MPG 2.2 m telescope at La Silla using the 8kx8k Wide-Field Imager (WFI). This data set, taken over a period of one year, represents the first field to be completed by the ongoing Deep Public Survey (DPS) being carried out as a part of the ESO Imaging Survey (EIS) project. The paper describes the optical observations, the techniques employed for un-supervised pipeline processing and the general characteristics of the final data set. Image processing has been performed using multi-resolution image decomposition techniques adapted to the EIS pipeline. The automatic processing steps include standard de-bias and flat-field, automatic removal of satellite tracks, de-fringing/sky-subtraction, image stacking/mosaicking and astrometry. Stacking of dithered images is carried out using pixel-based astrometry which enables the efficient removal of cosmic rays and image defects, yielding remarkably clean final images. The final astrometric calibration is based on a pre-release of the GSC-II catalog and has an estimated intrinsic accuracy of la 0.10 arcsec, with all passbands sharing the same solution. The data are taken in six different filters (U'UBVRI), cover an area of about 0.25 square degrees, and reach the 5σ limiting magnitudes of U'AB=26.0, UAB=25.7, BAB=26.4, VAB=25.4, RAB=25.5 and IAB=24.7 mag, as measured within a 2xFWHM aperture. The optical data covers an area of ∼0.1 square degree for which moderately deep observations in two near-infrared bands are also available, reaching 5σ limiting magnitudes of JAB∼23.4 and KAB∼22.6. The current optical/infrared data also fully encompass the region of the deep X-ray observations recently completed by the Chandra telescope. The optical data presented here, as well as the infrared data released earlier, are publicly available world-wide in the form of fully calibrated pixel and associated weight maps and source lists extracted in each passband. These data can be requested through the URL ``http://www.eso.org/eis''. Based on observations collected at the European Southern Observatory, La Silla, Chile within program ESO 164.O-O561. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file up.dat 133 42087 U' band catalog (EIS product ID P_ID=35) u.dat 133 37093 U band catalog (EIS product ID P_ID=34) b.dat 133 74827 B band catalog (EIS product ID P_ID=28) v.dat 133 45912 V band catalog (EIS product ID P_ID=31) r.dat 133 65148 R band catalog (EIS product ID P_ID=30) i.dat 133 43253 I band catalog (EIS product ID P_ID=29) up_filt.dat 18 85 U' band filter transmission WFI U #877 u_filt.dat 18 500 U band filter transmission WFI U #841 b_filt.dat 18 500 B band filter transmission WFI B #842 v_filt.dat 18 500 V band filter transmission WFI V #843 r_filt.dat 18 500 R band filter transmission WFI R #844 i_filt.dat 18 132 I band filter transmission WFI I #854
See also: http://www.eso.org/eis : ESO Imaging Survey home page J/A+A/384/81 : ESO Imaging Survey. CDF-S point sources (Hatziminaoglou+, 2002) J/A+AS/137/75 : ESO Imaging Survey. IV. (Zaggia+, 1999) J/A+AS/137/83 : ESO Imaging Survey. VII. (Scodeggio+, 1999) Byte-by-byte Description of file: b.dat i.dat r.dat u.dat up.dat v.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [EIS] 4- 22 A19 --- EIS EIS identification name (from J2000 position) 24- 25 I2 h RAh RA hour (J2000) 26 A1 --- --- [:] 27- 28 I2 min RAm RA min 29 A1 --- --- [:] 30- 34 F5.2 s RAs [0,60] RA sec 36 A1 --- DE- Sign of declination 37- 38 I2 deg DEd DEC degrees (J2000) 39 A1 --- --- [:] 40- 41 I2 arcmin DEm DEC arcminutes 42 A1 --- --- [:] 43- 46 F4.1 arcsec DEs [0,60] DEC arcseconds 48- 52 F5.2 mag Mtot ?=99.00 Total magnitude (1) 54- 60 F7.2 mag e_Mtot ?=99.00 Error in total magnitude (1) 62- 66 F5.2 mag Miso Isophotal magnitude (1) 68- 71 F4.2 mag e_Miso Error in Isophotal magnitude (1) 73- 77 F5.2 mag Maper ?=99.00 Aperture magnitude (1) 79- 84 F6.2 mag e_Maper ?=99.00 Error in Aperture magnitude (1) 86- 93 F8.2 --- S/N Signal to Noise (S/N) (2) 95-101 F7.2 arcsec2 area Isophotal area of the objects 103-111 F9.2 arcsec Rh Half-light radius in arcseconds 113-116 F4.2 --- b/a Minor to major-axis ratio 118-123 F6.2 deg PA [-90,90] Position angle 125-128 F4.2 --- Class Stellarity index computed by SExtractor (5) 130-131 I2 --- Flag SExtractor flags (3) 133 I1 --- f_EIS [0,2] EIS Flags (4)
Note (1): All magnitudes are given in the AB system. Mtot: Total magnitude as measured by SExtractor Miso: Isophotal magnitude as measured by SExtractor Maper: aperture magnitude (3 arcsec diameter) The magnitudes have been corrected for Galactic extinction taken from Schlegel et al. (1998ApJ...500..525S). The errors are those estimated by SExtractor and include only the shot noise of the measured source and background counts. Only objects detected with signal to noise ≥ 3 (based on the isophotal magnitude errors) have been included. Note (2): Signal to Noise (S/N). An estimate of S/N of the detection from the inverse of the errors estimated for the isophotal magnitude Note (3): SExtractor flags - see Bertin 1998, SExtractor User's Guide v2.0 The extraction flags are coded as a sum of powers of 2: 1 = The object has neighbors, bright and close enough to significantly bias the photometry, or bad pixels (more than 10% of the integrated area affected). 2 = The object was originally blended with another one. 4 = At least one pixel of the object is saturated (or very close to). 8 = The object is truncates (to close to an image boundary). 16 = Object's aperture data are incomplete or corrupted. 32 = Object's isophotal data are incomplete or corrupted. 64 = A memory overflow occurred during deblending. 128 = A memory overflow occurred during extraction. Note (4): EIS Flags These flags are used to identify objects in regions with very low weight or close to bright objects. Objects detected in regions with weight ≥ 30 % of the maximum weight (proportional to the total integration time) and not affected by bright stars have EIS flag=0. Objects with weight less than 30%, located at the edges of the frame, have EIS flag=1. EIS flag=2 indicates that the object is located in a region masked out due to the presence of a bright object. Note (5): a value close to 1 indicates a star; a value close to zero indicates a galaxy.
Byte-by-byte Description of file: *_filt.dat
Bytes Format Units Label Explanations
1- 8 F8.3 nm Lambda Wavelength 10- 18 F9.6 % Trans Transmission
Acknowledgements: We kindly thank Christophe Benoit and Luiz da Costa for their help in the preparation of this document.
(End) Mark Allen [CDS] 11-Apr-2002
|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|