The 1.2-Jy IRAS Redshift Survey is an ASCII file containing 5014 records in the format described in Table 1.

The coordinates for all objects that appear in the Point Source Catalog Version 2, are from that source; there are also a few very large galaxies whose fluxes and coordinates are taken from the Large Optical Galaxy Catalog.

Coded Flux Density: NF(4)

Each of the four wavelengths has a non-color-corrected flux density in units of Janskys, (1 Jy = 1.0E-26 W m-2 Hz-1). The quoted value is an average of all the hours-confirmed sightings as obtained by the prescription described in Explanatory Supplement V.H.5. The quality of each flux density is designated by FQUAL (see below). The flux densities have been calculated assuming an intrinsic source energy distribution such that the flux density f(nu) is proportional to 1/nu. Corrections to other spectral shapes can be made (see the description of color correction). The flux densities for sources so bright that they saturated the analog-to-digital converter on every sighting are lower limits based on the brightest value recorded. The uncertainties are given as ten times the quoted flux density and a flag is set in the CLEAN bits of the corresponding entry in the Ancillary Working Survey Database entry indicating saturation has occurred.

The IRAS fluxes are coded in a compact logarithmic form: The 12 micron flux is related to the integer NF12 by F12 = 10.^(NF12/1000 - 1.); similarly for the other fluxes. The fluxes are taken from the PSC, unless:

1. The object is extended at 60 microns (see SES2 below);
2. The object is variable (see VARFLAG below);
3. The object is of moderate flux quality at 60 microns (see FQUAL below).

In these cases, one-dimensional addscan's of the data have been obtained and the zero-crossing fluxes from the median scan in all four bands, as supplied by SCANPI, have been determined.

Those sources flagged as extended in Rice et al. (1988, ApJS, 68, 91) have fluxes from that source. The ID type is taken directly from the the Format of the PSC.

Small Extended Sources: SES2

This is related to the SES2 flag in the Format of the Point Source Catalog. The SES2 flag indicates whether or not an object is flagged as extended (SES2 > 0, for a given band, in the PSC).

 

SES2 =	0	Not extended
	1	Extended at 12 microns
	2	Extended at 25 microns
	3	Extended at 12 and 25 microns
	4	Extended at 60 microns
	5	Extended at 12 and 60 microns
	6	Extended at 25 and 60 microns
	7	Extended at 12, 25, and 60 microns
	8	Extended in Rice et al. 1988, ApJS, 68, 91

Point Source Correlation: CC

This is the same as the CC entry for the 60 micron band in the Format of the Point Source Catalog. The point source correlation coefficient can have values between 87-100%. These are encoded as alphabetic characters with A=100, B=99...N=87, one value per band. The value quoted is for the highest correlation coefficient seen for that source on any sighting.

Variability Flag: VARFLAG

This is derived from the VAR flags in the Format of the Point Source Catalog. VARFLAG here is a measure of variability in the 12 and 25 micron bands.

                     n  No measure of variability available.
                     0  No variability measured.
                     N  Variability between 1 and 10%.
                     1  Variability between 10 and 20%

and so on.