Limits on the X-ray emission from several hyperluminous IRAS galaxies |
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| Authors: | R J Wilman A C Fabian R M Cutri C S Crawford & W N Brandt |
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| Institution: | Institute of Astronomy, Madingley Road, Cambridge CB3 0HA,;IPAC, Caltech, MS 100-22, Pasadena, CA 91125, USA,;Department of Astronomy &38;Astrophysics, Pennsylvania State University, 525 Davey Lab, University Park, PA 16802, USA |
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| Abstract: | We report long, pointed ROSAT HRI observations of the hyperluminous galaxies IRAS F00235+1024, F12514+1027, F14481+4454 and F14537+1950. Two of them are optically classified as Seyfert-like. No X-ray sources are detected at the positions of any of the objects, with a mean upper limit L X/ L Bol ? 2.3 × 10?4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities N H > 1023 cm?2. They differ markedly from 'ordinary' Seyfert 2 galaxies, bearing a closer resemblance in the soft X-ray band to composite Seyfert 2 galaxies or to some types of starburst. |
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| Keywords: | galaxies: individual: IRAS F00235+1024 galaxies: individual: F12514+1027 galaxies: individual: F14481+4454 galaxies: individual: F14537+1950 infrared: galaxies X-rays: galaxies |
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