Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. II. The environment of the companion star - AstrophysicsReport as inadecuate




Multi-wavelength observations of Galactic hard X-ray sources discovered by INTEGRAL. II. The environment of the companion star - Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: Context: The INTEGRAL mission has led to the discovery of a new type ofsupergiant X-ray binaries SGXBs, whose physical properties differ from thoseof previously known SGXBs. Those sources are in the course of being unveiled bymeans of multi-wavelength X-rays, optical, near- and mid-infrared observations,and two classes are appearing. The first class consists of obscured persistentSGXBs and the second is populated by the so-called supergiant fast X-raytransients SFXTs. Aims: We report here mid-infrared MIR observations of thecompanion stars of twelve SGXBs from these two classes in order to assess thecontribution of the star and the material enshrouding the system to the totalemission.} Methods: We used data from observations we carried out at ESO-VLTwith VISIR, as well as archival and published data, to perform broad-bandspectral energy distributions of the companion stars and fitted them with acombination of two black bodies representing the star and a MIR excess due tothe absorbing material enshrouding the star, if there was any. Results: Wedetect a MIR excess in the emission of IGR J16318-4848, IGR J16358-4726, andperhaps IGR J16195-4945. The other sources do not exhibit any MIR excess evenwhen the intrinsic absorption is very high. abridged



Author: Farid Rahoui AIME, ESO, Sylvain Chaty AIME, SAp, Pierre-Olivier Lagage AIME, Eric Pantin AIME

Source: https://arxiv.org/



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