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II/126 IRAS Serendipitous Survey Catalog (IPAC 1986)
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IRAS Serendipitous Survey Catalog
Kleinmann S.G., Cutri R.M., Young E.T., Low F.J., Gillett F.C.
<Joint IRAS Science W.G.(1986)>
=1987issc.book.....K
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ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys
Description:
This is a catalog of 12, 25, 60 and 100 micron photometric
observations of 43,866 point-like sources detected fortuitiously in
the Infrared Astronomical Satellite Pointed Observation program. The
main objective was to take advantage of the longer-than-nominal
integration time per source to extend the detection threshold relative
to that of the Point Source Catalog (PSC); about three-fourths of the
Serendipitous Survey Catalog (SSC) sources do not appear in the PSC.
From 1813 Pointed Observation fields, the effective sky coverage is
1108 square degrees. Relative to the PSC, the SSC is characterized by:
enhanced sensitivity (by a factor of about 4) in all four wavelength
bands; excellent reliability in uncrowded fields; uneven sky coverage
and completeness; reduced positional accuracy; improved photometric
accuracy; much greater depth in crowded fields at the expense of
reliability and accuracy. The SSC data processing, the catalog
format, and an analysis are given in the Explanatory Supplement to the
IRAS Serendipitous Survey Catalog.
Reference(s):
Kleinmann S.G., Cutri R.M., Young E.T., Low F.J., and
Gillett F.C. 1986, Explanatory Supplement to the IRAS
Serendipitous Survey Catalog (Pasadena: JPL)
IRAS Catalogs and Atlases Explanatory Supplement, 1988, ed. Beichman C.,
Neugebauer G., Habing H.J., Clegg P.E., and Chester T.J.
(Washington, DC: GPO), NASA RP-1190, vol 1
Young E.T., Neugebauer G., Kopan E.L., Benson R.D., Conrow T.P.,
Rice W.L., and Gregorich D.T. 1985, A User's Guide to IRAS Pointed
Observation Products, IPAC Preprint PRE-008N
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
headers.dat 150 1813 Information about the reference and confirming
grids (observations) in which point sources
were identified
sources.dat 159 43886 Properties of the point sources identified
assoc.dat 56 29583 Information about positional associations
with sources in other catalogs
meaning.txt 80 235 Details of association catalogues
overlap.dat 71 950 Overlapping fields (Appendix A)
ssc.doc 80 106 Information about interpretation of catalog
entries, from the Explanatory Supplement
to the IRAS Serendipitous Survey Catalog,
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Byte-by-byte Description of file: headers.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- FNAME Field Name (1) (2)
The IRAS/SSC field name is the position of
the center of the reference grid, given in
the form hhmmssSddmmss.
14- 18 I5 --- RGRID Reference Grid No. (2)
The reference grid has the lower 60 um
median noise.
19- 21 I3 JD RDATE Observation Date of RGRID (2)
(JD 2445000 +)
22- 26 I5 --- CGRID Confirming Grid No. (2)
27- 29 I3 JD CDATE Observation Date of CGRID (2)
(JD 2445000 +)
30 A1 --- MACRO Macro Type (2) (3)
31- 33 I3 deg GLON Galactic Longitude (2)
34- 36 I3 deg GLAT Galactic Latitude (2)
37 A1 --- PDRAS Sign of R.A. Difference between Grid centers
38- 40 I3 arcsec PDRA Amplitude of R.A. Diff. between Grid Centers
41 A1 --- PDDECS Sign of Dec. Difference between Grid Centers
42- 44 I3 arcsec PDDEC Amplitude of Dec. Diff. between Grid Centers
45- 48 I4 deg RANGLE Reference Grid Scan Direction (E of N)
49- 52 I4 deg CANGLE Confirming Grid Scan Direction (E of N)
53- 55 I3 0.01deg2 EFFAREA Effective Area of Grid Overlap (2)
covered by both the reference and
confirming grids (in 0.01 square degrees).
56- 57 I2 --- RUNDF No. of additional grid pairs with
Overlap > 5% (2)
81-100 4I5 mJy RNOISE Median Noise of Ref. Grid (1 value per band)
101-120 4I5 mJy CNOISE Median Noise of Conf. Grid (1 value per band)
121-132 4I3 --- NSOURC Number of Confirmed Sources
(1 value per band)
133-144 4I3 --- NCONF Number of Confused Confirmations (2)
(1 value per band)
145-147 I3 --- CIRRUS Number of 100 um only Confirmed Sources (2)
148-150 I3 --- NMERGE Number of Merged Sources, i.e. number of
source records following the field header.
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Note (1):
Fields are listed in order of increasing Right Ascension of the
Reference Grid center.
Note (2):
This quantity is listed in the printed version of the catalog.
Note (3):
Macro code is (Table II.A of "Explanations")
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Code Name Scans Length Cross-step SNR Gain
arcmin arcmin improvement
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A DPS02B 6 96 0.3 4.8
B DPS05B 3 360 1.0 3.5
C DPS52B 6 96 0 4.8
D DPS55B 3 360 0 3.5
E DPS60B 4 60 0.8 4.0
F DPS60D 5 48 0.4 4.4
G DPS61C 12 48 0.2 6.9
H DPS61D 15 48 0.2 7.7
I DPS62D 9 96 0.4 6.0
J DPS63D 3 96 0.8 3.5
K DPS60C 5 48 0.4 4.4
L TPS52B 6 96 0 4.8
M DPS60M 5 48 0.4 4.4
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Byte-by-byte Description of file: sources.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- NAME IRAS/SSC Source Name (1)
12- 13 I2 h RAh Right Ascension 1950 (hours)
14- 15 I2 min RAm Right Ascension 1950 (minutes)
16- 18 I3 0.1s RAds Right Ascension 1950 (seconds)
19 A1 --- DE- Declination 1950 (Sign)
20- 21 I2 deg DEd Declination 1950 (degrees)
22- 23 I2 arcmin DEm Declination 1950 (minutes)
24- 25 I2 arcsec DEs Declination 1950 (seconds)
27- 29 I3 --- ANGLE Position Angle of SSC Source Error Box
expressed in degrees East of North.
31- 66 4E9.3 Jy FLUX Averaged Non-color Corrected Flux Densities(2)
(1 value per band) (1Jy = 10-26 W/m2/Hz)
67- 70 4I1 --- FQUAL Flux Density Quality (2)
high-quality=3, moderate quality=2,
upper limit =1 (1 value per band)
71- 75 I5 --- RGRID Reference Grid Number
81- 92 4I3 % RELUNC ?Percent Relative Flux Density (2)
Uncertainties (1 value per band)
93-108 4I4 --- TLSNR ?10x Local Signal-to-Noise Ratio
(1 value per band)
109-112 4A1 --- CC Point Source Correlation Coefficient (2)
between 70-100%. These are encoded as
alphabetic characters with
A=100, B=99..Z=75-70 (1 value per band)
The quoted correlation coefficients come
from the reference or confirming grids,
whichever is higher, for high quality
sources.
113-120 4I2 --- TRFLUX ?10x Fc/Fr (confirmed/reference)i
(1 value per band)
SSC sources can have flux density ratios
0.5 < Fc/Fr < 2.0.
121 A1 --- POSDRS12 Right Ascension Delta Sign (12 um)
122-124 I3 arcsec POSDR12 ?Right Ascension Delta
125 A1 --- POSDDS12 Declination Delta Sign
126-128 I3 arcsec POSDD12 ?Declination Delta
129 A1 --- POSDRS22 Right Ascension Delta Sign (25 um)
130-132 I3 arcsec POSDR22 ?Right Ascension Delta
133 A1 --- POSDDS22 Declination Delta Sign
134-136 I3 arcsec POSDD22 ?Declination Delta
137 A1 --- POSDRS32 Right Ascension Delta Sign (60 um)
138-140 I3 arcsec POSDR32 ?Right Ascension Delta
141 A1 --- POSDDS32 Declination Delta Sign
142-144 I3 arcsec POSDD32 ?Declination Delta
145 A1 --- POSDRS42 Right Ascension Delta Sign (100 um)
146-148 I3 arcsec POSDR42 ?Right Ascension Delta
149 A1 --- POSDDS42 Declination Delta Sign
150-152 I3 arcsec POSDD42 ?Declination Delta
153-156 4I1 --- PNEARC ?Number of Sources in Confusion Window (2) (3)
(1 value per band)
157-158 I2 --- NID Number of Positional Associations (2)
159 I1 --- IDTYPE Type of Object (2)
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Note (1):
Sources are listed in order of increasing Right Ascension within each
field.
Note (2):
This quantity is listed in the printed version of the SSC.
Note (3):
In regions of high source density, the Pointed Observation
source extraction process, as well as the Serendipitous
Survey Confirmation and Band Merging processing, can result
in degraded positions and incorrectly band merged sources.
PNEARC is 1-(number of confirmed sources in the confusion
and band merge window).
Any value greater than zero is indicative of potential confusion
in the processing and the resulting source information should be
examined carefully, e.g. by inspection of the grids in question.
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Byte-by-byte Description of file: assoc.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- CATNO Catalog Number (1)
3- 17 A15 --- SOURCE Source ID
18- 22 A5 --- TYPE Source Type/Spectral Class (2)
23- 25 I3 arcsec RADIUS Radius Vector from SSC Position to Association
26- 28 I3 deg POS Position Angle from SSC Position to
Association (E of N)
29- 32 I4 --- FIELDl Object Field #1 Dependent (3)
33- 36 I4 --- FIELD2 Object Field #2 Dependent (4)
37- 40 I4 --- FIELD3 Object Field #3 Dependent (5)
41- 51 A11 --- NAME SSC Name association (6)
52- 56 I5 --- RGRID SSC Name association (6)
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Note (1):
For associations with the IRAS/PSC, this value is 41.
Note (2):
For associations with the IRAS/PSC, this field is left blank.
Note (3):
For associations with the IRAS/PSC, this value is a flag indicating the
bands in which the source was detected with medium or high quality; it
is encoded as indicated in the PSC Supplement Table X.B.2.
Note (4):
For associations with the IRAS/PSC, this value is the PSC 2.0 Flux Density
in the shortest (first) wavelength band in which it was detected. Flux
Densities higher than 10 Jy are encoded 9999.
Note (5):
For associations with the IRAS/PSC, this value is the PSC 2.0 Flux Density
in the second wavelength band in which it was detected. Flux Densities
higher than 10 Jy are encoded 9999.
Note (6):
These fields are a repetition of bytes 1-11 and 71-75 of "sources" table.
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Byte-by-byte Description of file: overlap.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- GRID0 ?Reference Grid No. (1)
7- 11 I5 --- GRID1 ?First overlapping grid no., >5% overlap
with Reference Grid
13- 16 I4 arcmin2 OVLP1 ?Overlapping area (First and Ref.)
18- 22 I5 --- GRID2 ?Second overlapping grid, >5% overlap
with Ref.
24- 27 I4 arcmin2 OVLP2 ?Overlapping area (Second and Ref.)
29- 33 I5 --- GRID3 ?3rd overlapping grid, >5% overlap
35- 38 I4 arcmin2 OVLP3 ?Overlapping area
40- 44 I5 --- GRID4 ?4th overlapping grid, >5% overlap
46- 49 I4 arcmin2 OVLP4 ?Overlapping area
51- 55 I5 --- GRID5 ?5th overlapping grid, >5% overlap
57- 60 I4 arcmin2 OVLP5 ?Overlapping area
62- 66 I5 --- GRID6 ?6th overlapping grid, >5% overlap
68- 71 I4 arcmin2 OVLP6 ?Overlapping area
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Note (1):
If a Reference Grid is overlapped (>5% of area) by more than six grids,
the list of overlapping grids grids is continued in succeeding records.
In this case, bytes 1-6 of each continuation record are blank.
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(End) Francois Ochsenbein [CDS], Seth Digel [SSDOO/ADC] 14-Aug-1997