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For refcode 1998AJ....116.2682C:
Retrieve 217 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
1998AJ....116.2682C THE ROSAT/IRAS GALAXY SAMPLE REVISITED J. J. CONDON AND Q. F. YIN National Radio Astronomy Observatory,1 520 Edgemont Road, Charlottesville, VA 22903; jcondon@nrao.edu, qyin@nrao.edu T. X. THUAN Department of Astronomy, University of Virginia, Box 3818, Charlottesville, VA 22903; txt@virginia.edu AND TH. BOLLER Max-Planck-Institut fur extraterrestrische Physik, D-85740 Garching bei Munchen; bol@rosat.mpe-garching.mpg.de Received 1997 April 8; revised 1998 August 25 ABSTRACT Galaxies in the ROSAT/IRAS sample were selected by their soft X-ray (0.1-2.4 keV) and far-infrared ({lambda} = 60 micron) 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 micron) 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 micron radiation. Normal and starburst galaxies probably do not account for a significant fraction of the soft X-ray background. Key words: galaxies: active-infrared: galaxies-radio continuum: galaxies- stars: formation-X-rays: galaxies
Retrieve 217 NED objects in this reference.
Please click here for ADS abstract

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