Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....116.2682c&link_type=abstract
The Astronomical Journal, Volume 116, Issue 6, pp. 2682-2716.
Astronomy and Astrophysics
Astronomy
38
Galaxies: Active, Infrared: Galaxies, Radio Continuum: Galaxies, Stars: Formation, X-Rays: Galaxies
Scientific paper
Galaxies in the ROSAT/IRAS sample were selected by their soft X-ray (0.1-2.4 keV) and far-infrared (lambda = 60 μm) emission. The relatively large uncertainties in the original ROSAT and IRAS positions caused some contamination by close pairs and forced the exclusion of most ``high-flux'' (S > 10 Jy at lambda = 100 μm) IRAS sources from the original sample. We used new 1.4 GHz VLA images of all objects north of delta = -45 deg along with improved X-ray and far-infrared positions to eliminate incorrect identifications, many of which appeared to be starburst galaxies with high X-ray luminosities, log [X(ergs^-1)] > 43. We also used VLA images to search for new X-ray identifications among the ``high-flux'' sources with delta > -45 deg. Only two were found, indicating that luminous starburst galaxies have relatively low soft X-ray luminosities, in part due to absorption by a dense interstellar medium. No starburst galaxies in our revised sample have X-ray luminosities approaching log [X(ergs^-1)] = 43. We conclude that most galaxies in the revised ROSAT/IRAS sample contain X-ray-emitting active galactic nuclei (AGNs) residing in star-forming disks that emit most of the lambda = 60 μm radiation. Normal and starburst galaxies probably do not account for a significant fraction of the soft X-ray background.
Boller Th.
Condon James J.
Thuan Trinh Xuan
Yin Qi-Feng
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