Limits on the X‐ray emission from several hyperluminous IRAS galaxies
Identifieur interne : 000625 ( Main/Exploration ); précédent : 000624; suivant : 000626Limits on the X‐ray emission from several hyperluminous IRAS galaxies
Auteurs : R. J. Wilman ; A. C. Fabian ; R. M. Cutri ; 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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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></front></TEI><affiliations><list><country><li>États-Unis</li></country><region><li>Pennsylvanie</li></region><settlement><li>University Park (Pennsylvanie)</li></settlement><orgName><li>Université d'État de Pennsylvanie</li></orgName></list><tree><noCountry><name sortKey="Crawford, C S" sort="Crawford, C S" uniqKey="Crawford C" first="C. S." last="Crawford">C. S. Crawford</name><name sortKey="Cutri, R M" sort="Cutri, R M" uniqKey="Cutri R" first="R. M." last="Cutri">R. M. 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