Access to Astronomical Catalogues

← Click to display the menu
J/ApJS/154/673      COBE DIRBE Point Source Catalog          (Smith+, 2004)

The COBE DIRBE Point Source Catalog. Smith B.J., Price S.D., Baker R.I. <Astrophys. J. Suppl. Ser., 154, 673 (2004)> =2004ApJS..154..673S
ADC_Keywords: Infrared sources ; Surveys ; Photometry, infrared Mission_Name: COBE Keywords: stars: AGB and post-AGB - stars: variable: Miras - astronomical databases: catalogs - infrared: stars Abstract: We present the COBE DIRBE Point Source Catalog, an all-sky catalog containing infrared photometry in 10 bands from 1.25 microns to 240 microns for 11788 of the brightest near and mid-infrared point sources in the sky. Since DIRBE had excellent temporal coverage (100-1900 independent measurements per object during the 10 month cryogenic mission), the Catalog also contains information about variability at each wavelength, including amplitudes of variation observed during the mission. Since the DIRBE spatial resolution is relatively poor (0.7°), we have carefully investigated the question of confusion, and have flagged sources with infrared-bright companions within the DIRBE beam. In addition, we filtered the DIRBE light curves for data points affected by companions outside of the main DIRBE beam but within the `sky' portion of the scan. At high Galactic latitudes (|b|>5°), the Catalog contains essentially all of the unconfused sources with flux densities greater than 90, 60, 60, 50, 90, and 165 Jy at 1.25, 2.2, 3.5, 4.9, 12, and 25 microns, respectively, corresponding to magnitude limits of approximately 3.1, 2.6, 1.7, 1.3, -1.3, and -3.5. At longer wavelengths and in the Galactic Plane, the completeness is less certain because of the large DIRBE beam and possible contributions from extended emission. The Catalog also contains the names of the sources in other catalogs, their spectral types, variability types, and whether or not the sources are known OH/IR stars. We discuss a few remarkable objects in the Catalog. Description: DIRBE (Diffuse Infrared Background Experiment) is one of the 3 instruments on board of the COBE (Cosmic Background Explorer) mission (November 1989 to June 1990). The results of the DIRBE broadband photometry in 10 infrared bands between 1.25 and 240µm and infrared variability parameters for 11788 sources are presented in table1. For each source, for comparison IRAS and 2MASS photometry are also included, along with SIMBAD spectral types and published variability types. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 592 11788 DIRBE Photometry and Variability table4.dat 181 11788 2MASS/IRAS/MSX Photometry table5.dat 69 94658 Companion Information table8.dat 235 11788 DIRBE Catalog Associations filters.dat 58 800 Transmission of DIRBE filters
See also: : DIRBE home page V/98 : MSX Infrared Astrometric Catalog (Egan+ 1996) II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) II/225 : Catalog of Infrared Observations, Edition 5 (Gezari+ 1999) III/197 : IRAS Low Resolution Spectra (IRAS team, 1987) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 17 A17 --- DIRBE DIRBE name (G1) 19- 34 A16 --- 2MASS 2MASS name (2) 36- 58 A23 --- IRAS IRAS/MSX name (3) 60- 68 F9.1 Jy F1.25 ?=-99.9 1.25µm weighted mean flux density (4) 70- 78 F9.1 Jy e_F1.25 ?=-99.9 RMS error of F1.25 80- 88 F9.1 Jy eF1.25 ?=-99.9 Average 1.25µm light curve errorbar 90- 95 F6.2 mag D1.25 ?=-99.9 1.25 light curve var. amplitude (5) 97-102 F6.2 mag e_D1.25 ?=-99.90 Uncertainty in the D1.25 104-107 I4 --- o_F1.25 Number of 1.25µm unfiltered datapoints 109-117 F9.1 Jy F2.2 2.2µm weighted mean flux density (4) 119-127 F9.1 Jy e_F2.2 ?=-99.9 RMS error of F2.2 129-137 F9.1 Jy eF2.2 ?=-99.9 Average 2.2µm light curve errorbar 139-144 F6.2 mag D2.2 ?=-99.9 2.2um light curve variation amplitude (5) 146-151 F6.2 mag e_D2.2 ?=-99.90 Uncertainty in the D2.2 153-156 I4 --- o_F2.2 Number of 2.2µm unfiltered datapoints 158-166 F9.1 Jy F3.5 ?=-99.9 3.5µm weighted mean flux density (4) 168-176 F9.1 Jy e_F3.5 ?=-99.9 RMS error of F3.5 178-186 F9.1 Jy eF3.5 ?=-99.9 Average 3.5µm light curve errorbar 188-193 F6.2 mag D3.5 ?=-99.9 3.5um light curve variation amplitude (5) 195-200 F6.2 mag e_D3.5 ?=-99.90 Uncertainty in the D3.5 202-205 I4 --- o_F3.5 Number of 3.5 µm unfiltered datapoints 207-215 F9.1 Jy F4.9 ?=-99.9 4.9µm weighted mean flux density (4) 217-225 F9.1 Jy e_F4.9 ?=-99.9 RMS error of F4.9 227-235 F9.1 Jy eF4.9 ?=-99.9 Average 4.9µm light curve errorbar 237-242 F6.2 mag D4.9 ?=-99.9 4.9um light curve variation amplitude (5) 244-249 F6.2 mag e_D4.9 ?=-99.90 Uncertainty in the D4.9 251-254 I4 --- o_F4.9 Number of 4.9µm unfiltered datapoints 256-264 F9.1 Jy F12 ?=-99.9 12µm weighted mean flux density (4) 266-274 F9.1 Jy e_F12 ?=-99.9 RMS error of F12 276-284 F9.1 Jy eF12 ?=-99.9 Average 12µm light curve errorbar 286-291 F6.2 mag D12 ?=-99.9 12um light curve variation amplitude (5) 293-298 F6.2 mag e_D12 ?=-99.90 Uncertainty in the D12 300-303 I4 --- o_F12 Number of 12µm unfiltered datapoints 305-313 F9.1 Jy F25 ?=-99.9 25µm weighted mean flux density (4) 315-323 F9.1 Jy e_F25 ?=-99.9 RMS error of F25 325-333 F9.1 Jy eF25 ?=-99.9 Average 25µm light curve errorbar 335-340 F6.2 mag D25 ?=-99.9 25um light curve variation amplitude (5) 342-347 F6.2 mag e_D25 ?=-99.90 Uncertainty in the D25 349-352 I4 --- o_F25 Number of 25µm unfiltered datapoints 354-362 F9.1 Jy F60 ?=-99.9 60µm weighted mean flux density (4) 364-372 F9.1 Jy e_F60 ?=-99.9 RMS error of F60 374-382 F9.1 Jy eF60 ?=-99.9 Average 60µm light curve errorbar 384-389 F6.2 mag D60 ?=-99.9 60um light curve variation amplitude (5) 391-396 F6.2 mag e_D60 ?=-99.90 Uncertainty in the D60 398-401 I4 --- o_F60 Number of 60µm unfiltered datapoints 403-411 F9.1 Jy F100 ?=-99.9 100µm weighted mean flux density (4) 413-421 F9.1 Jy e_F100 ?=-99.9 RMS error of F100 423-431 F9.1 Jy eF100 ?=-99.9 Average 100µm light curve errorbar 433-438 F6.2 mag D100 ?=-99.9 100um light curve variation amplitude (5) 440-445 F6.2 mag e_D100 ?=-99.90 Uncertainty in the D100 447-450 I4 --- o_F100 Number of 100µm unfiltered datapoints 452-460 F9.1 Jy F140 ?=-99.9 140µm weighted mean flux density (4) 462-470 F9.1 Jy e_F140 ?=-99.9 RMS error of F140 472-480 F9.1 Jy eF140 ?=-99.9 Average 140µm light curve errorbar 482-487 F6.2 mag D140 ?=-99.9 140um light curve variation amplitude (5) 489-494 F6.2 mag e_D140 ?=-99.90 Uncertainty in the D140 496-499 I4 --- o_F140 Number of 140µm unfiltered datapoints 501-509 F9.1 Jy F240 ?=-99.9 240µm weighted mean flux density (4) 511-519 F9.1 Jy e_F240 ?=-99.9 RMS error of F240 521-529 F9.1 Jy eF240 ?=-99.9 Average 240µm light curve errorbar 531-536 F6.2 mag D240 ?=-99.9 240um light curve variation amplitude (5) 538-543 F6.2 mag e_D240 ?=-99.90 Uncertainty in the D240 545-548 I4 --- o_F240 Number of 240µm unfiltered datapoints 550-552 I3 --- f_F1.25 1.25µm confusion flags (6) 554-556 I3 --- f_F2.2 2.2µm confusion flags (6) 558-560 I3 --- f_F3.5 3.5µm confusion flags (6) 562-564 I3 --- f_F4.9 4.9µm confusion flags (6) 566-568 I3 --- f_F12 12µm confusion flags (6) 570-572 I3 --- f_F25 25µm confusion flags (6) 574-576 I3 --- f_F60 60µm confusion flags (6) 578-580 I3 --- f_F100 100µm confusion flags (6) 582-584 I3 --- f_F140 140µm confusion flags (6) 586-588 I3 --- f_F240 240µm confusion flags (6)
Note (2): Because of the method that the Catalog was constructed, all DIRBE Point Source Catalog sources have either an IRAS/MSX or a 2MASS counterpart (with the exception of the four special sources noted in the text). A 2MASS name is not given if there was no 2MASS counterpart to the IRAS/MSX source with J≤4.51 and/or K≤3.81. Note (3): Note that an IRAS/MSX name is only given if there is an IRAS/MSX counterpart to the 2MASS source with F(12um)≥15Jy and/or F(25um)≥27.5Jy. Note (4): -99.9 = no information is available. Note (5): Calculated from the light curve after it has been block-averaged in weekly blocks using a running average. Note that this may not be the full amplitude of variation for the star, since the light curve may be incomplete or not cover a full pulsation period. This parameter is set to -99.9 if the weekly-averaged light curve at minimum is detected at less than a 3σ level. Note (6): Confusion flags are as follows: Flag1 = 1: IRAS/2MASS/MSX/CIO/(Egan & Price, Cat. V/98) companion greater than the DIRBE noise level within a 0.5 degree radius. This flag was not set at 140 or 240µm Flag2 = 1: Greater than 3σ discrepancy between the time-averaged DIRBE flux density and the IRAS or 2MASS flux density. This flag is not set for the Catalog of Infrared Observation comparison or the MSX catalog comparison, because of possible large uncertainties in the photometry. It was also not set at 140 or 240 microns, due to the lack of an all-sky survey at those wavelengths. This flag may be an indicator of extended emission around a point source rather than a discrete companion. Alternatively, it may indicate strong variability. Flag3 = 1: This flag was set if the rms/<errorbar> in the light curve was M=3 for any 2-week period containing at least 10 datapoints. This is an indication that the light curve may be affected by a nearby companion that was missed by the filtering process.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 17 A17 --- DIRBE DIRBE name (G1) (G2) 19- 34 A16 --- 2MASS 2MASS name 36- 58 A23 --- IRAS IRAS name 60- 66 F7.3 mag Jmag ?=-99.99 2MASS J Magnitude 68- 74 F7.3 mag e_Jmag ?=-99.990 Uncertainty in Jmag 76- 82 F7.3 mag Hmag ?=-99.99 2MASS H Magnitude 84- 90 F7.3 mag e_Hmag ?=-99.990 Uncertainty in Hmag 92- 98 F7.3 mag Kmag ?=-99.99 2MASS Ks Magnitude 100-106 F7.3 mag e_Kmag ?=-99.990 Uncertainty in Kmag 108-116 F9.3 Jy F12i ?=-99.99 The IRAS 12µm flux density 118-126 F9.3 Jy F25i ?=-99.99 The IRAS 25µm flux density 128-136 F9.3 Jy F60i ?=-99.99 The IRAS 60µm flux density 138-146 F9.3 Jy F100i ?=-99.99 IRAS 100µm flux density 148-150 I3 --- q_F12i ?=-99.9 IRAS 12µm quality flag 152-154 I3 --- q_F25i ?=-99.9 IRAS 25µm quality flag 156-158 I3 --- q_F60i ?=-99.9 IRAS 60µm quality flag 160-163 I4 --- q_F100i ?=-99.9 IRAS 100µm quality flag 165-167 I3 --- Var ?=-99.9 IRAS VAR parameter 169 A1 --- Conf IRAS confusion flag 171-173 I3 --- CIRR1 ?=-99.9 IRAS CIRR1 flag 175-177 I3 --- CIRR2 ?=-99.9 IRAS CIRR2 flag 179-181 I3 --- CIRR3 ?=-99.9 IRAS CIRR3 flag
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 17 A17 --- DIRBE DIRBE name (G1) (1) 19- 24 F6.2 um Wave DIRBE band central wavelength (2) 26- 48 A23 --- Name Name of the companion (3) 50- 59 F10.1 Jy Flux Catalog companion flux density 61- 69 F9.6 deg Off Companion offset from the DIRBE Catalog position
Note (1): This table contains information about companion sources within the DIRBE beam. DIRBE Catalog sources are only included in this table if they have been flagged because they have a companion in the DIRBE beam above 25, 20, 20, 10, 30, or 55 Jy at 1.25, 2.2, 3.5, 4.9, 12, and 25µm, respectively. Note (2): Note that these are the DIRBE wavelengths, not the wavelength of the original observation, which may be slightly different. Note (3): the companions are from: - At 1.25 and 2.2µm, companions are from the 2MASS Catalog. - At 12 or 25µm, the companions are from the IRAS Point Source Catalog or the IRAS Small Scale Structure Catalog. - At 3.5µm, companions are from the Catalog of Infrared Observations. - At 4.9µm, companions are either from the Catalog of Infrared Observations, or from the synthetic Egan and Price (1996, Cat. V/98) 4.2µm list. Names of sources from the Egan and Price (1996, Cat. V/98) list are preceded by `E+P' to distinguish them from those in the Catalog of Infrared Observations.
Byte-by-byte Description of file: table8.dat
Bytes Format Units Label Explanations
1- 17 A17 --- DIRBE The DIRBE name (G1) (G2) 19- 34 A16 --- 2MASS The 2MASS name 36- 58 A23 --- IRAS The IRAS name 60- 85 A26 --- SName The SIMBAD Name 87- 89 A3 --- SObj The SIMBAD object type 91-101 A11 --- SType The SIMBAD spectral type 103-106 F4.1 arcsec Off Offset between SIMBAD and DIRBE positions 108-133 A26 --- SName2 The second SIMBAD name (2) 135-137 A3 --- SObj2 The second SIMBAD source object type 139-149 A11 --- SType2 The second SIMBAD source spectral type 151-154 F4.1 arcsec SOff ? Offset between the two SIMBAD positions 156 A1 --- LRS The IRAS LRS type (3) 158-169 A12 --- Name The GCVS, NSV, or NSVS name 171-180 A10 --- VarType The GCVS variability type 182-183 A2 --- OH OH/IR star compilation (4) 185 A1 --- l_Per Limit flag on Per 186-193 F8.2 d Per ?=-99.9 The GCVS/NSV/NSVS period 195-199 F5.1 km/s EVel ?=-99.9 The OH expansion velocity (5) 201 A1 --- Cat [TU0] The 2MASS associated optical catalog (6) 206-211 F6.2 mag Bmag ?=-99.99 2MASS optical B band magnitude 216-221 F6.2 mag Vmag ?=-99.99 2MASS optical V band magnitude 223-228 F6.2 deg GLON Galactic longitude 230-235 F6.2 deg GLAT Galactic latitude
Note (2): If within 5 arcsec of first position. Note (3): From Kwok et al. (1997, Cat. J/ApJS/112/557; see Cat. III/197) Note (4): Set to `OH' if in Chen et al. (2001, Cat. J/A+A/368/1006) OH/IR star compilation Note (5): From Chen et al. (2001, Cat. J/A+A/368/1006) OH/IR star compilation. Note (6): T = Tycho-2 (Cat. I/259), U = USNO-A2.0 (Cat. I/252). See 2MASS Explanatory Supplement for more information.
Byte-by-byte Description of file (# headlines): filters.dat
Bytes Format Units Label Explanations
1- 7 F7.3 um lambda Wavelength 9- 12 F4.2 --- T1 [0,1] Transmission for filter#1 (1.25um) 14- 17 F4.2 --- T2 [0,1] Transmission for filter#2 (2.2um) 19- 22 F4.2 --- T3 [0,1] Transmission for filter#3 (3.5um) 24- 27 F4.2 --- T4 [0,1] Transmission for filter#4 (4.9um) 29- 32 F4.2 --- T5 [0,1] Transmission for filter#5 (12um) 34- 37 F4.2 --- T6 [0,1] Transmission for filter#6 (25um) 39- 42 F4.2 --- T7 [0,1] Transmission for filter#7 (60um) 44- 47 F4.2 --- T8 [0,1] Transmission for filter#8 (100um) 49- 52 F4.2 --- T9 [0,1] Transmission for filter#9 (140um) 54- 57 F4.2 --- T10 [0,1] Transmission for filter#10 (240um)
Global notes: Note (G1): This is the letter `D' followed by the position (2000 epoch) in format, with the decimals removed and X=P for positive declinations and X=M for negative declinations. Note (G2): All sources in the Catalog have either a 2MASS association, an IRAS association, or both. Note that 2MASS associations to the IRAS sources are only included if 2MASS J magnitude ≤4.51 or 2MASS K magnitude ≤3.81, and IRAS associations to the IRAS sources are only included if IRAS F(12um)≥15Jy or F(25um)≥27.5Jy.
Acknowledgements: Beverly J. Smith History: * 13-Jul-2004: Original version from Beverly J. Smith * 20-Nov-2010: added file "filters.dat" (from LAMBDA site)
(End) Beverly J. Smith [ETSU, USA], Patricia Vannier [CDS] 13-Jul-2004
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

catalogue service