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| Paper: |
The contribution of Ulirgs to the X-ray background |
| Volume: |
290, Active Galactic Nuclei: from Central Engine to Host Galaxy |
| Page: |
541 |
| Authors: |
Risaliti, G. |
| Abstract: |
We present BeppoSAX observations of a few new Ultraluminous Infrared Galaxies. The sources are from an unbiased sample selected through the total infrared luminosity. This selection avoids a bias towards starburst-dominated objects, which affects most of the ULIRG samples, selected using the 60 micron flux density. Therefore, this sample is best suited to investigate the relative contribution of AGNs and starbursts to ULIRGs. The high energy instrument PDS (20-200 keV) is able to discover very highly obscured AGNs. Therefore, this work can also put a significant lower limit to the presence of QSO2s inside ULIRGs. |
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