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The Black Hole Candidate & X-Ray Transient IGR J17091−3624

23 Apr 2012, 10:30 UTC
The Black Hole Candidate & X-Ray Transient IGR J17091−3624
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Cataclysmic variables (CVs) are a certain class of binary star system. Some CV systems usually contain a main sequence star, similar to our Sun in mass, that is accreting it’s gases onto a compact remnant; usually a white dwarf, but sometimes a neutron star (NS) or the ultra compact singularity known colloquially as a black hole (BH). Such ultra compact systems are known as X-ray transients which are more often, throughout their evolution, in a dormant state or quiescent state (Kolb & Burderi 1996; Sguera et al. 2005). During this dormancy they usually remain undetected in X-rays. Occasionally such systems go from a quietly quiescent state into a more energetic state [e.g. GRO J1655 - 40 (Hjellming & Rupen 1995); XTE J1810-197 (Ibrahim et al. 2004); GX 339-4 (Belloni et al. 2005); IGR J11215-5952 (Sidoli et al. 2007); H1743-322 (McClintock et al. 2009)], increasing their X-ray luminosities increase by several orders of magnitude bringing them into focus, as it were, in the X-ray wavelengths. This increase in magnitude is believed to be due to accretion instabilities flowing onto the compact object of the binary system (van Paradijs 1996).
One black hole X-ray transient of intense interest recently is IGR J17091-3624. ...

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