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On the origin of the HLX-1 outbursts

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arxiv 1608.01924 v1 pith:TI5XRMM6 submitted 2016-08-05 astro-ph.HE

classification astro-ph.HE
keywords hlx-1outburstsblackholemathrmpeakphysicalproperties
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abstract

HLX-1, currently the best intermediate-mass black hole candidate, has undergone seven violent outbursts, each with a peak X-ray luminosity of $L_{\mathrm{peak},\mathrm{X}}\sim 10^{42}\ \rm{erg\ s^{-1}}$. Interestingly, the properties of the HLX-1 outbursts evolve with time. In this work, we aim to constrain the physical parameters of the central engine of the HLX-1 outbursts in the framework of the black hole accretion. We find that the physical properties of the HLX-1 outbursts are consistent with being driven by the radiation pressure instability. This scenario can explain the evolution of the recurrent timescales of the HLX-1 outbursts as a function of the durations.

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