Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19s.124x&link_type=abstract
"Progress in Astronomy, Vol. 19, Supp., p. 124 - 128 (2001). In: Proceedings of the Fourth China-Germany Workshop on Cosmology "
Astronomy and Astrophysics
Astronomy
Ultraluminous Galaxies: Soft X Rays, Iras Galaxies
Scientific paper
We present the results of the cross-correlation of a sample of 903 Ultraluminous IRAS galaxies (ULIRGs) selected from PSCz redshift survey with the ROSAT-All Sky Survey Bright Source Catalogue and the ROSAT archived pointing observations. In total, 35 ULIRGs are securely detected by the ROSAT All-Sky Survey and pointing observations. We find that the ratio of the soft X-ray to the far-infrared flux spans about 5 orders of magnitude. This ratio should be a good indicator of the main energy source of ULIRGs. This ratio is low for most ULIRGs and hyperluminous infrared galaxies, which explains their low detection rate by ROSAT and ASCA. We also find that some ULIRGs have a similar soft X-ray luminosity vs. temperature relation to that for groups of galaxies and elliptical galaxies, suggesting a common origin of these systems.
Boller Th.
Börner Gerhard
Deng Zu-Gang
Xia Xiao-Yang
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