Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-05-10
AIP Conf.Proc.1010:235-241,2008
Astronomy and Astrophysics
Astrophysics
Invited contribution at "A population explosion: the nature and evolution of X-ray binaries in diverse environments", conferen
Scientific paper
10.1063/1.2945048
A new type of high-energy binary system has been revealed by the INTEGRAL satellite. These sources are being unveiled by means of multi-wavelength optical, near- and mid-infrared observations. Among these sources, two distinct classes are appearing: the first one is constituted of intrinsically obscured high-energy sources, of which IGR J16318-4848 seems to be the most extreme example. The second one is populated by the so-called supergiant fast X-ray transients, with IGR J17544-2619 being the archetype. We report here on multi-wavelength optical to mid-infrared observations of a sample constituted of 21 INTEGRAL sources. We show that in the case of the obscured sources our observations suggest the presence of absorbing material (dust and/or cold gas) enshrouding the whole binary system. We finally discuss the nature of these two different types of sources, in the context of high energy binary systems.
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