7073 VII/73 IRAS Small Scale Structure Catalog, Ver 1.00 G Helou D W Walker Jet Propulsion Laboratory ??? ??? 1985 1985isss.book.....H Photometry, infrared Nonstellar objects Infrared sources 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.

PSCname IRAS source name --- BMFlg Number of bands in source and band merging warning flag --- RAh Hours RA, equinox 1950.0, epoch 1983.5 h RAm Minutes RA, equinox 1950.0, epoch 1983.5 min RAs Seconds RA, equinox 1950.0, epoch 1983.5 s DE- Sign Dec, equinox 1950.0, epoch 1983.5 --- DEd Degrees Dec, equinox 1950.0, epoch 1983.5 deg DEm Minutes Dec, equinox 1950.0, epoch 1983.5 arcmin DEs Seconds Dec, equinox 1950.0, epoch 1983.5 arcsec NH_12 Number of hours-confirmed sightings, 12um --- NH_25 Number of hours-confirmed sightings, 25um --- NH_60 Number of hours-confirmed sightings, 60um --- NH_100 Number of hours-confirmed sightings, 100um --- Fnu_12 Average non-color corrected, spatially integ- rated flux density, 12um number=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. Jy Fnu_25 Average non-color corrected, spatially integ- rated flux density, 25um number=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. Jy Fnu_60 Average non-color corrected, spatially integ- rated flux density, 60um number=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. Jy Fnu_100 Average non-color corrected, spatially integ- rated flux density, 100um number=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. Jy Xtalk_12 Cross-talk flag, 12um number=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. --- Xtalk_25 Cross-talk flag, 25um number=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. --- Xtalk_60 Cross-talk flag, 60um number=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. --- Xtalk_100 Cross-talk flag, 100um number=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. --- NearPS_12 Number of near-by weeks-confirmed point sources, 12um --- NearPS_25 Number of near-by weeks-confirmed point sources, 25um --- NearPS_60 Number of near-by weeks-confirmed point sources, 60um --- NearPS_100 Number of near-by weeks-confirmed point sources, 100um --- SES1_12 Number of nearby FISES entries, 12um --- SES1_25 Number of nearby FISES entries, 25um --- SES1_60 Number of nearby FISES entries, 60um --- SES1_100 Number of nearby FISES entries, 100um --- Cir Number of hours-confirmed, 100um-only point sources --- HD High source density flag, encoded, one bit per band --- DblPS Possibility this is a double point source (1 bit per band) --- PtSrc Name of IRAS Point Source counterpart and conflict flag --- Psiz_12 Size estimate from comparison of FLUX with PTSRC flux, 12um darcsec Psiz_25 Size estimate from comparison of FLUX with PTSRC flux, 25um darcsec Psiz_60 Size estimate from comparison of FLUX with PTSRC flux, 60um darcsec Psiz_100 Size estimate from comparison of FLUX with PTSRC flux, 100um darcsec NID Number of positional associations --- IDType Type of objects associated --- Fqlt_12 12um flux quality class --- Fcat_12 12um final selection flags --- Dra_12 Right ascension offset from mean position to 12um s Ddec_12 Declination offset from mean position to 12um arcsec Unc_12 95% confidence diameter for position at 12um darcmin NS_12 Number of individual detections at 12um --- Fqlt_25 25um flux quality class --- Fcat_25 25um final selection flags --- Dra_25 Right ascension offset from mean position to 25um s Ddec_25 Declination offset from mean position to 25um arcsec Unc_25 95% confidence diameter for position at 25um darcmin NS_25 Number of individual detections at 25um --- Fqlt_60 60um flux quality class --- Fcat_60 60um final selection flags --- Dra_60 Right ascension offset from mean position to 60um s Ddec_60 Declination offset from mean position to 60um arcsec Unc_60 95% confidence diameter for position at 60um darcmin NS_60 Number of individual detections at 60um --- Fqlt_100 100um flux quality class --- Fcat_100 100um final selection flags --- Dra_100 Right ascension offset from mean position to 100um s Ddec_100 Declination offset from mean position to 100um arcsec Unc_100 95% confidence diameter for position at 100um darcmin NS_100 Number of individual detections at 100um --- PSCName IRAS source name --- RecNo Main data table record number for SSS source --- CatNum Catalog number number=1 See Table X.B.4 in the "IRAS Catalogs and Atlases Explanatory Supplement" also included in the file "meaning.txt" in this directory. --- Source Source identification --- Type Source type or spectral class --- Radius Radius vector from IRAS source to association arcsec Pos Position angle (E of N), IRAS source to object deg Field1 Object data field 1, catalog dependent number=1 See Table X.B.4 in the "IRAS Catalogs and Atlases Explanatory Supplement" also included in the file "meaning.txt" in this directory. --- Field2 Object data field 2, catalog dependent number=1 See Table X.B.4 in the "IRAS Catalogs and Atlases Explanatory Supplement" also included in the file "meaning.txt" in this directory. --- Field3 Object data field 3, catalog dependent number=1 See Table X.B.4 in the "IRAS Catalogs and Atlases Explanatory Supplement" also included in the file "meaning.txt" in this directory. --- irassss.docThe original ADC document meaning.txtDetails of association catalogues Gail L. Schneider SSDOO/ADC 1998Apr08 VII_73.xml