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 X-ray study of HLX1: intermediate-mass black hole or foreground neutron star


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We re-assess the XMM-Newton and Swift observations of HLX1, to examine the evidence for its identification as an intermediate-mass black hole. We show that the X-ray spectral and timing properties are equally consistent with an intermediate-mass black hole in a high state, or with a foreground neutron star with a luminosity of about a few times 10^{32} erg-s ~ 10^{-6} L {Edd}, located at a distance of about 1.5 to 3 kpc. Contrary to previously published results, we find that the X-ray spectral change between the two XMM-Newton observations of 2004 and 2008 going from power-law dominated to thermal dominated is not associated with a change in the X-ray luminosity. The thermal component becomes more dominant and hotter during the 2009 outburst seen by Swift, but in a way that is consistent with either scenario.



Author: Roberto Soria; Luca Zampieri; Silvia Zane; Kinwah Wu

Source: https://archive.org/



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