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 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:
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FileName Lrecl Records Explanations
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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
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See also:
http://lambda.gsfc.nasa.gov/product/cobe/about_dirbe.cfm : 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
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Bytes Format Units Label Explanations
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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)
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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/ 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.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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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
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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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
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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.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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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
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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.
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Byte-by-byte Description (#) of file: filters.dat
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Bytes Format Units Label Explanations
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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)
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Global notes:
Note (G1): This is the letter `D' followed by the position (2000 epoch)
in hhmmss.ssXddmmss.ss 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.
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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