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II/156A     IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989)

IRAS Faint Source Catalog, |b| > 10 Degrees, Version 2.0 Moshir, M., Copan, G., Conrow, T., McCallon, H., Hacking, P., Gregorich, D., Rohrbach, G., Melnyk, M., Rice, W., Fullmer, L., and Chester, T.J. <Infrared Processing and Analysis Center (1989)> =1990IRASF.C......0M
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys Mission_Name: IRAS Description: The Faint Source Survey (FSS) is the definitive Infrared Astronomical Satellite data set for faint point sources. The FSS was produced by point-source filtering the individual detector data streams and then coadding those data streams using a trimmed-average algorithm. The resulting images, or plates, give the best estimate from the IRAS survey data of the point source flux density at every surveyed point of the sky. The Faint Source Catalog (FSC) is a compilation of the sources extracted from the FSS plates that have met reasonable reliability requirements. Averaged over the whole catalog, the FSC is at least 98.5% reliable at 12 and 25 microns, and ∼94% at 60 microns. For comparison, the IRAS Point Source Catalog (PSC) is >99.997% reliable, but the sensitivity of the FSC exceeds that of the PSC by about a factor of 2.5. The FSC contains data for 173,044 point sources in unconfused regions with flux densities typically above 0.2 Jy at 12, 25, and 60 microns, and above 1.0 Jy at 100 microns. The FSS plates are somewhat more sensitive but less reliable than the FSC; typically, only sources with SNR>5-6 in the plates are contained in the FSC. Sources with SNR>3 but which do not meet the reliability requirements of the FSC are catalogued in the Faint Source Reject File (FSR, Cat. II/275). The data products, the processing methods used to produce them, results of an analysis of these products, and cautionary notes are given in the Explanatory Supplement to the IRAS Faint Source Survey (see references in fsc.txt). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file fsc.txt 84 897 Original description (ADC CD-ROM Vol. 1, 1991) SIMPLE.fih 80 60 FITS header main.dat 227 173044 IRAS Faint Sources main.fih 80 306 associated FITS header assoc.dat 64 235935 Associations assoc.fih 79 94 associated FITS header meaning.txt 80 304 Details of association catalogues tofits.sh 80 74 Unix shell to generate FITS (1)
Note (1): This small script should run on any Unix platform. To generate the FITS version of the tables, execute ./tofits main > main.fits (for the main table) ./tofits assoc > assoc.fits (for the association file)
See also: II/125 : IRAS Point Source Catalog (IRAS-PSC) II/126 : IRAS Serendipitous Survey Catalog (IRAS-SSC, sources SHHMMm+DDMMA) II/274 : IRAS Point Source Reject Catalog (IRAS-PSR, sources RHHMMm+DDMM) II/275 : IRAS Faint Source Reject Catalog (sources IRAS ZHHMMm+DDMMA) VII/73 : IRAS Small Scale Structure Catalog (IRAS-SSSC, sources XHHMM+DDd) II/174 : IRAS 2Jy Redshift Survey Data File II/190 : IRAS Minor Planet Survey Data Base VII/91 : IRAS Asteroid and Comet Survey VII/109 : IRAS Observations of Large Optical Galaxies VII/113 : Catalogued Galaxies + QSOs observed in IRAS Survey Byte-by-byte Description of file: main.dat
Bytes Format Units Label Explanations
1- 12 A12 --- IRAS IRAS faint source name (starts by F) 13- 14 I2 h RAh Hours RA, equinox 1950.0, epoch 1983.5 15- 16 I2 min RAm Minutes RA, equinox 1950.0, epoch 1983.5 17- 19 I3 0.1s RAds Deci-seconds RA 20 A1 --- DE- Sign of 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- 29 I3 arcsec Major Uncertainty ellipse major axis 30- 32 I3 arcsec Minor Uncertainty ellipse minor axis 33- 35 I3 deg PosAng Uncertainty ellipse position angle 36- 38 I3 --- o_Fnu12 ? Number of times observed at 12um 39- 41 I3 --- o_Fnu25 ? Number of times observed at 25um 42- 44 I3 --- o_Fnu60 ? Number of times observed at 60um 45- 47 I3 --- o_Fnu100 ? Number of times observed at 100um 48- 56 E9.3 Jy Fnu12 Non-color corrected flux density at 12um 57- 65 E9.3 Jy Fnu25 Non-color corrected flux density at 25um 66- 74 E9.3 Jy Fnu60 Non-color corrected flux density at 60um 75- 83 E9.3 Jy Fnu100 Non-color corrected flux density at 100um 84 I1 --- q_Fnu12 Flux density quality at 12um 85 I1 --- q_Fnu25 Flux density quality at 25um 86 I1 --- q_Fnu60 Flux density quality at 60um 87 I1 --- q_Fnu100 Flux density quality at 100um 88- 90 I3 % e_Fnu12 Relative flux density uncertainty at 12um 91- 93 I3 % e_Fnu25 Relative flux density uncertainty at 25um 94- 96 I3 % e_Fnu60 Relative flux density uncertainty at 60um 97- 99 I3 % e_Fnu100 Relative flux density uncertainty at 100um 100-101 I2 % Rel Percent minimum source reliability 102-108 E7.1 --- SNR12 ? Signal/Noise ratio at 12um 109-115 E7.1 --- SNR25 ? Signal/Noise ratio at 25um 116-122 E7.1 --- SNR60 ? Signal/Noise ratio at 60um 123-129 E7.1 --- SNR100 ? Signal/Noise ratio at 100um 130-136 E7.1 --- locSNR12 ? Local Signal/Noise ratio at 12um 137-143 E7.1 --- locSNR25 ? Local Signal/Noise ratio at 25um 144-150 E7.1 --- locSNR60 ? Local Signal/Noise ratio at 60um 151-157 E7.1 --- locSNR100 ? Local Signal/Noise ratio at 100um 158-160 I3 pix A12 ? Number of pixels above threshold at 12um 161-163 I3 pix A25 ? Number of pixels above threshold at 25um 164-166 I3 pix A60 ? Number of pixels above threshold at 60um 167-169 I3 pix A100 ? Number of pixels above threshold at 100um 170-171 I2 --- Ncat Number of nearby catalog sources (6') 172-173 I2 --- Nx12 Number of nearby extractions at 12 um 174-175 I2 --- Nx25 Number of nearby extractions at 25 um 176-177 I2 --- Nx60 Number of nearby extractions at 60 um 178-179 I2 --- Nx100 Number of nearby extractions at 100 um 180-181 I2 --- Cir1 Number of nearby 100 um-only extractions 182-183 I2 --- Conf Confusion flag, 1 per band, bit-encoded (1) 184-188 F5.2 --- NoisC12 ? Noise correction factor at 12um 189-193 F5.2 --- NoisC25 ? Noise correction factor at 25um 194-198 F5.2 --- NoisC60 ? Noise correction factor at 60um 199-203 F5.2 --- NoisC100 ? Noise correction factor at 100um 204-205 I2 --- nID ? Number of positional associations 206-207 I2 --- Type ? Type of associated object (G1) 208-212 F5.3 --- NoisR12 ? Ratio of 85% to 68% quantiles of flux distribution at 12um 213-217 F5.3 --- NoisR25 ? Ratio of 85% to 68% quantiles of flux distribution at 25um 218-222 F5.3 --- NoisR60 ? Ratio of 85% to 68% quantiles of flux distribution at 60um 223-227 F5.3 --- NoisR100 ? Ratio of 85% to 68% quantiles of flux distribution at 100um
Note (1): corresponding to 12, 25, 60 and 100um from lowest to highest bit. Therefore the confusion flags are set in the bands as follows: 1 = confusion in 12um band 2 = confusion in 25um band 4 = confusion in 60um band 8 = confusion in 100um band Confusion in multiple bands are expressed by a sum of the values, e.g. 12 (8+4) means a confusion in 60 and 100µm bands.
Byte-by-byte Description of file: assoc.dat
Bytes Format Units Label Explanations
1- 12 A12 --- IRAS IRAS source name 13- 18 I6 --- RecNo Main data table record number for IRAS source 19- 20 I2 --- catID Catalog number, details in file "meaning.txt" 21- 35 A15 --- Source Source identification 36- 40 A5 --- Type Source type or spectral class, or association catalog type (G1) 41- 43 I3 arcsec Dist Distance of IRAS source to association 44- 46 I3 deg dPA Position angle from IRAS source to association 47- 49 I3 arcsec dMaj Distance from IRAS source to association along major axis of IRAS uncertainty ellipse 50- 52 I3 arcsec dMin Distance from IRAS source to association along minor axis of IRAS uncertainty ellipse 53- 56 I4 --- Field1 ?=-999 Object data field 1, catalog dependent 57- 60 I4 --- Field2 ?=-999 Object data field 2, catalog dependent 61- 64 I4 --- Field3 ?=-999 Object data field 3, catalog dependent
Global Notes: Note (G1): Type ranges from 1 to 15 and states whether an association was found in: * a stellar catalogue (bit 0 = 1) (*) * an extragalactic catalog (bit 1 = 2) (*) * catalogs with other types of objects (bit 2 = 4) or * in a catalog with mixed types (bit 3 = 8). For example, if associations were found to both an extragalactic catalog and a stellar catalog, Type is set to 3 (2+1). (*) The meaning of these two bits are different from what is stated in the original documentation "fsc.txt" file.
History: * Original description from Susan Gessner (NASA/GSFC) in 1989 (see file "fsc.txt") * 24-Feb-1993: standardized documentation at CDS * 30-Jan-2009: description homogenized with other IRAS catalogs at CDS.
(End) 24-Feb-1993
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

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