NSSDCA ID: ASIR-00052
Availability: At NSSDC, Ready for Offline Distribution (or Staging if Digital)
The IRAS Sky Survey Atlas (ISSA) is a set of 12.5 x 12.5 degree surface brightness images, with 1.5 arcmin pixels. Each image represents the sky surface brightness minus a zodiacal emission model at a particular IRAS wavelength (12, 25, 60, or 100 microns) within a specified field on the sky. The images are in FITS format. The three IRAS hours-confirmed sky surveys (HCONs) are presented both separately and coadded. (Volume 2 contains the separated HCONs only for ecliptic latitudes below 50 degrees, i.e., the area not covered by volume 1, plus coadded images covering the whole sky.) The fields covering ecliptic latitudes within 20 degrees of the ecliptic plane are known as the ISSA Reject Set because significant residual zodiacal emission remains in the data. Image analysis software and a program that determines which ISSA field covers a particular position on the sky are included on the CDs. To have a complete set of individual HCON images (full sky coverage; three hours-confirmed surveys plus coadded images), one must have both ISSA CD sets. In particular, the 1991 CD set (vol.1) covers absolute ecliptic latitudes greater than 50 degrees and, although coadded high ecliptic latitude images are repeated on the 1994 CDs (vol. 2), the corresponding HCON 1, 2, and 3 images are not.
Questions and comments about this data collection can be directed to: Dr. David T. Leisawitz
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