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The "Large Galaxy Catalog" contains IRAS observations of 85 galaxies
listed in RC2 with apparent blue light isophotal diameters (D_25)
greater than 8'. Surface brightness maps at 12, 25, 60 and 100 microns
are given in FITS format for each galaxy. There are only 83 sets of
maps because NGC 205 and M 31 are in one field, as are M 81 and M 82.
The maps were made using Pointed Observation data
when these were available. An estimate of the diffuse zodiacal plus
Galactic emission, derived locally, is subtracted in each case. Rice
et al. (1988) describe the data processing method, present a table of
attributes of the maps (galaxy name, map center coordinates and
dimensions, pixel sizes, and noise estimates), and give total galactic
flux densities. A separate IPAC
Report by Rice and Kopan (1988) serves as a user's guide to the data
product.
References: Rice, W. L. and Kopan, E. L. 1988, "IRAS Surface Brightness Maps of Large Optical Galaxies," IPAC Report, 15 February 1988. Version and release date: 1.0, 1988 Mar |