ADC/CDS Standard Document for Catalog:/catalogs/2/2156A/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
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., Chester T.J.
<Infrared Processing and Analysis Center (1989)>
=1989ifss.book.....M
================================================================================
ADC_Keywords: Infrared sources ; Photometry, infrared ; Surveys
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). 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.doc).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
fsc.doc 84 897 CD-ROM Documentation
main.dat 227 173044 IRAS Faint Sources
assoc.dat 64 235935 Associations
meaning.txt 80 304 Details of association catalogues
--------------------------------------------------------------------------------
See also:
II/125 : IRAS Point Source Catalog
II/126 : IRAS Serendipitous Survey Catalog
II/174 : IRAS 2Jy Redshift Survey Data File
II/190 : IRAS Minor Planet Survey Data Base
VII/73 : IRAS Small Scale Structure Catalog
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 --- Name Source name
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 UncMajor Uncertainty ellipse major axis
30- 32 I3 arcsec UncMinor Uncertainty ellipse minor axis
33- 35 I3 deg PosAng Uncertainty ellipse position angle
36- 38 I3 --- Nobs_12 ? Number of times observed at 12um
39- 41 I3 --- Nobs_25 ? Number of times observed at 25um
42- 44 I3 --- Nobs_60 ? Number of times observed at 60um
45- 47 I3 --- Nobs_100 ? Number of times observed at 100um
48- 56 E9.3 Jy Fnu_12 Non-color corrected flux density at 12um
57- 65 E9.3 Jy Fnu_25 Non-color corrected flux density at 25um
66- 74 E9.3 Jy Fnu_60 Non-color corrected flux density at 60um
75- 83 E9.3 Jy Fnu_100 Non-color corrected flux density at 100um
84 I1 --- FQual_12 Flux density quality at 12um
85 I1 --- FQual_25 Flux density quality at 25um
86 I1 --- FQual_60 Flux density quality at 60um
87 I1 --- FQual_100 Flux density quality at 100um
88- 90 I3 --- Relunc_12 Percent relative flux density uncertainty
at 12um
91- 93 I3 --- Relunc_25 Percent relative flux density uncertainty
at 25um
94- 96 I3 --- Relunc_60 Percent relative flux density uncertainty
at 60um
97- 99 I3 --- Relunc_100 Percent relative flux density uncertainty
at 100um
100-101 I2 --- MinRel Percent minimum source reliability
102-108 E7.1 --- SNR_12 ? SNR at 12um
109-115 E7.1 --- SNR_25 ? SNR at 25um
116-122 E7.1 --- SNR_60 ? SNR at 60um
123-129 E7.1 --- SNR_100 ? SNR at 100um
130-136 E7.1 --- LocSNR_12 ? Local SNR at 12um
137-143 E7.1 --- LocSNR_25 ? Local SNR at 25um
144-150 E7.1 --- LocSNR_60 ? Local SNR at 60um
151-157 E7.1 --- LocSNR_100 ? Local SNR at 100um
158-160 I3 --- Area_12 ? Number of pixels above threshold at 12um
161-163 I3 --- Area_25 ? Number of pixels above threshold at 25um
164-166 I3 --- Area_60 ? Number of pixels above threshold at 60um
167-169 I3 --- Area_100 ? Number of pixels above threshold at
100um
170-171 I2 --- CatNbr Number of nearby catalog sources
172-173 I2 --- ExtNbr_12 Number of nearby extractions at 12 um
174-175 I2 --- ExtNbr_25 Number of nearby extractions at 25 um
176-177 I2 --- ExtNbr_60 Number of nearby extractions at 60 um
178-179 I2 --- ExtNbr_100 Number of nearby extractions at 100 um
180-181 I2 --- Cirrus Number of nearby 100 um-only extractions
182-183 I2 --- Confuse Confusion flag, 1 per band, hex-encoded
184-188 F5.2 --- NoisCor_12 ? Noise correction factor at 12um
189-193 F5.2 --- NoisCor_25 ? Noise correction factor at 25um
194-198 F5.2 --- NoisCor_60 ? Noise correction factor at 60um
199-203 F5.2 --- NoisCor_100 ? Noise correction factor at 100um
204-205 I2 --- NID ? Number of positional associations
206-207 I2 --- IDType ? Type of object
208-212 F5.3 --- NoisRat_12 ? Ratio of 85% to 68% of flux distribution
at 12um
213-217 F5.3 --- NoisRat_25 ? Ratio of 85% to 68% of flux distribution
at 25um
218-222 F5.3 --- NoisRat_60 ? Ratio of 85% to 68% of flux distribution
at 60um
223-227 F5.3 --- NoisRat_100 ? Ratio of 85% to 68% of flux distribution
at 100um
--------------------------------------------------------------------------------
Byte-by-byte Description of file: assoc.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 12 A12 --- Name IRAS source name
13- 18 I6 --- RecNo Main data table record number for IRAS source
19- 20 I2 --- CatNo 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 from IRAS source to
association
47- 49 I3 arcsec DstMajor Distance from IRAS source to association
50- 52 I3 arcsec DstMinor Distance from IRAS source to association
53- 56 I4 --- Field1 Object data field 1, catalog dependent
57- 60 I4 --- Field2 Object data field 2, catalog dependent
61- 64 I4 --- Field3 Object data field 3, catalog dependent
--------------------------------------------------------------------------------
Note (1): Detailed explanations are presented in the file meaning.txt.
================================================================================
(End) 24-Feb-1993