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VII/73 IRAS Small Scale Structure Catalog, Ver 1.00 (Helou, Walker 1985)
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IRAS Small Scale Structure Catalog
Helou G., Walker D.W.
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ADC_Keywords: Photometry, infrared ; Nonstellar objects ; Infrared sources
Description:
Sources resolved by the Infrared Astronomical Satellite in any band
(12, 25, 60, or 100 microns) but smaller than eight arcmin in angular
extent are to be found in the Small Scale Structure Catalog, also
known as the catalog of "small extended sources." The catalog gives
the infrared characteristics of 16740 objects including, e.g.,
galaxies, planetary nebulae and compact H II regions. The catalog
lists for each entry and in each band separately: a position accurate
to about one arcminute (rms); a flux density accurate to 50% (rms)
overall, and better at high signal to noise ratios; a rough indicative
size if a point source is present at the same location; and a variety
of warning and processing flags. If a detailed shape description, or a
more accurate poistion, flux, or size are needed, these must be
determined from the raw detector output. Incompleteness is a complex
function of wavelength band, brightness, and location, so the absence
of an entry in the SSS Catalog does not necessarily imply the lack of
detectable extended emission. Many entries, mostly at 60 and 100
microns, refer only to emission features that are details in larger
structures known as Galactic cirrus. Complete documentation, including
a description of the catalog format, is contained in the printed
version.
References:
IRAS Catalogs: The Small Scale Structure Catalog, 1988, eds. Helou, G.,
and Walker, D.W. (Washington, DC: GPO), NASA RP-1190, vol 7
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
irassss.dat 180 16740 IRAS Small Scale Structure Catalog Sources
assoc.dat 58 5178 Information about positional associations
with sources in other catalogs
meaning.txt 80 235 Details of association catalogues
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Byte-by-byte Description of file: irassss.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- PSCname IRAS source name
11 A1 --- BMFlg Number of bands in source and band merging
warning flag
12- 13 I2 h RAh Hours RA, equinox 1950.0, epoch 1983.5
14- 15 I2 min RAm Minutes RA, equinox 1950.0, epoch 1983.5
16- 19 F4.1 s RAs Seconds RA, equinox 1950.0, epoch 1983.5
20 A1 --- DE- Sign Dec, equinox 1950.0, epoch 1983.5
21- 22 I2 deg DEd Degrees Dec, equinox 1950.0, epoch 1983.5
23- 24 I2 arcmin DEm Minutes Dec, equinox 1950.0, epoch 1983.5
25- 26 I2 arcsec DEs Seconds Dec, equinox 1950.0, epoch 1983.5
27 A1 --- NH_12 Number of hours-confirmed sightings, 12um
28 A1 --- NH_25 Number of hours-confirmed sightings, 25um
29 A1 --- NH_60 Number of hours-confirmed sightings, 60um
30 A1 --- NH_100 Number of hours-confirmed sightings, 100um
31- 38 E8.2 Jy Fnu_12 Average non-color corrected, spatially integ-
rated flux density, 12um (1)
39- 46 E8.2 Jy Fnu_25 Average non-color corrected, spatially integ-
rated flux density, 25um (1)
47- 54 E8.2 Jy Fnu_60 Average non-color corrected, spatially integ-
rated flux density, 60um (1)
55- 62 E8.2 Jy Fnu_100 Average non-color corrected, spatially integ-
rated flux density, 100um (1)
63 A1 --- Xtalk_12 Cross-talk flag, 12um (1)
64 A1 --- Xtalk_25 Cross-talk flag, 25um (1)
65 A1 --- Xtalk_60 Cross-talk flag, 60um (1)
66 A1 --- Xtalk_100 Cross-talk flag, 100um (1)
67 A1 --- NearPS_12 Number of near-by weeks-confirmed point
sources, 12um
68 A1 --- NearPS_25 Number of near-by weeks-confirmed point
sources, 25um
69 A1 --- NearPS_60 Number of near-by weeks-confirmed point
sources, 60um
70 A1 --- NearPS_100 Number of near-by weeks-confirmed point
sources, 100um
71 A1 --- SES1_12 Number of nearby FISES entries, 12um
72 A1 --- SES1_25 Number of nearby FISES entries, 25um
73 A1 --- SES1_60 Number of nearby FISES entries, 60um
74 A1 --- SES1_100 Number of nearby FISES entries, 100um
75- 76 I2 --- Cir Number of hours-confirmed, 100um-only point
sources
77 A1 --- HD High source density flag, encoded, one bit
per band
78 A1 --- DblPS Possibility this is a double point source
(1 bit per band)
79- 90 A12 --- PtSrc Name of IRAS Point Source counterpart and
conflict flag
91- 93 I3 darcsec Psiz_12 Size estimate from comparison of FLUX
with PTSRC flux, 12um
94- 96 I3 darcsec Psiz_25 Size estimate from comparison of FLUX
with PTSRC flux, 25um
97- 99 I3 darcsec Psiz_60 Size estimate from comparison of FLUX
with PTSRC flux, 60um
100-102 I3 darcsec Psiz_100 Size estimate from comparison of FLUX
with PTSRC flux, 100um
103-104 I2 --- NID Number of positional associations
105-108 I4 --- IDType Type of objects associated
109 A1 --- Fqlt 12um flux quality class (2)
110 A1 --- Fcat 12um final selection flags (2)
111-116 F6.1 s Dra Right ascension offset from mean position to
12um (2)
117-120 I4 arcsec Ddec Declination offset from mean position to
12um (2)
121-123 I3 darcmin Unc 95% confidence diameter for position at
12um (2)
124-126 I3 --- NS Number of individual detections at 12um (2)
127 A1 --- Fqlt 25um flux quality class (2)
128 A1 --- Fcat 25um final selection flags (2)
129-134 F6.1 s Dra Right ascension offset from mean position to
25um (2)
135-138 I4 arcsec Ddec Declination offset from mean position to
25um (2)
139-141 I3 darcmin Unc 95% confidence diameter for position at
25um (2)
142-144 I3 --- NS Number of individual detections at 25um (2)
145 A1 --- Fqlt 60um flux quality class (2)
146 A1 --- Fcat 60um final selection flags (2)
147-152 F6.1 s Dra Right ascension offset from mean position to
60um (2)
153-156 I4 arcsec Ddec Declination offset from mean position to
60um (2)
157-159 I3 darcmin Unc 95% confidence diameter for position at
60um (2)
160-162 I3 --- NS Number of individual detections at 60um (2)
163 A1 --- Fqlt 100um flux quality class (2)
164 A1 --- Fcat 100um final selection flags (2)
165-170 F6.1 s Dra Right ascension offset from mean position to
100um (2)
171-174 I4 arcsec Ddec Declination offset from mean position to
100um (2)
175-177 I3 darcmin Unc 95% confidence diameter for position at
100um (2)
178-180 I3 --- NS Number of individual detections at 100um (2)
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Note (1): This quantity appears with a different format or representation, or is
omitted in the printed version of the catalog.
(2): These fields are blank if the source was not detected in the corres-
ponding IRAS band.
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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- 10 A10 --- PSCName IRAS source name
11- 17 I7 --- RecNo Main data table record number for SSS source
18- 20 I3 --- CatNum Catalog number (1)
21- 35 A15 --- Source Source identification
36- 40 A5 --- Type Source type or spectral class
41- 43 I3 arcsec Radius Radius vector from IRAS source to association
44- 46 I3 deg Pos Position angle (E of N), IRAS source to object
47- 50 I4 --- Field1 Object data field 1, catalog dependent (1)
51- 54 I4 --- Field2 Object data field 2, catalog dependent (1)
55- 58 I4 --- Field3 Object data field 3, catalog dependent (1)
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Note (1): See Table X.B.4 in the "IRAS Catalogs and Atlases Explanatory
Supplement" also included in the file "meaning.txt" in this directory.
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(End) Gail L. Schneider [SSDOO/ADC] 25-Sep-1995