Limits on the X-ray emission from several hyperluminous IRAS galaxies
Identifieur interne : 000603 ( Main/Exploration ); précédent : 000602; suivant : 000604Limits on the X-ray emission from several hyperluminous IRAS galaxies
Auteurs : R. J. Wilman ; A. C. Fabian ; R. M. Cutri [États-Unis] ; C. S. Crawford ; W. N. Brandt [États-Unis]Source :
- Monthly Notices of the Royal Astronomical Society [ 0035-8711 ] ; 1998-10-11.
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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 LX/LBol ≃ 2.3 × 10−4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities NH > 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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DOI: 10.1046/j.1365-8711.1998.02047.x
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Le document en format XML
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<front><div type="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 LX/LBol ≃ 2.3 × 10−4. This indicates that any active nuclei are either atypically weak at X-ray wavelengths or obscured by column densities NH > 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.</div>
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