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Ultraluminous X-ray Sources and their Near-Infrared Counterparts

16 Sep 2020, 17:21 UTC
Ultraluminous X-ray Sources and their Near-Infrared Counterparts
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Title: NIR Counterparts to ULXs (III): Completing the photometric survey and selected spectroscopic resultsAuthors: : K. M. López, M. Heida, P. G. Jonker , M. A. P. Torres, T. P. Roberts, D. J. Walton, D.-S. Moon, F. A. HarrisonFirst Author’s Institution: SRON Netherlands Institute for Space Research, 3584 CA Utrecht, The NetherlandsStatus: Published in MNRAS, open access on arXivX-ray binaries are systems with a primary that is a compact object like a black hole or neutron star. The compact object accretes material from the companion (the donor star), emitting brightly in X-rays. Outside of our galaxy, some of these X-ray sources have been observed to have luminosities exceeding the Eddington Limit for a stellar-mass black hole (L ~ 1039 ergs/s), we call these sources Ultraluminous X-ray sources (ULXs). There are a few possibilities for the origin of such high luminosities. One explanation is geometry – the Eddington limit assumes that emission occurs isotropically — if emission is actually beamed, then the luminosity is overestimated. Another possibility is if the black hole is actually an intermediate mass black hole accreting below the Eddington limit for its mass (> 100 M☉). In order to understand the nature of these objects, it’s necessary ...

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