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An absorbed view of a new class of INTEGRAL sources | | Erik Kuulkers
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28 Apr 2005 | | Subject: | astro-ph | | Affiliation: | ISOC, ESA/ESAC, Spain | | Abstract: | The European gamma-ray observatory INTEGRAL has found a group of hard X-ray sources which are highly absorbed, i.e., with column densities higher than about 10^{23}/cm^2. Here I give an overview of this class of INTEGRAL sources. The X-ray, as well as the optical/IR, properties of these sources and their location in the sky suggest that they belong to the class of high-mass X-ray binaries, some of them possibly long-period X-ray pulsars. The donors in these binaries are most probably giant or supergiant stars. I suggest that the soft X-ray spectrum below ~5 keV of IGR J16318-4848, as well as in several other X-ray binaries (e.g., XTE J0421+56), can be described by emission from a compact object which is strongly absorbed by a partionally ionised dense envelope. | | Source: | arXiv, astro-ph/0504625 | | Services: | Forum | Review | PDF | Favorites | |
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