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Oxford University Press, Monthly Notices of the Royal Astronomical Society, 1(450), p. 787-793, 2015

DOI: 10.1093/mnras/stv505

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The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust

Journal article published in 2015 by Andrew D. Sutton, Timothy P. Roberts ORCID, Jeanette C. Gladstone, Dominic J. Walton
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The known members of the class of hyperluminous X-ray sources (HLXs) are few in number, yet they are of great interest as they are regarded as the likeliest intermediate-mass black hole (IMBH) candidates amongst the wider population of ultraluminous X-ray sources (ULXs). Here we report optical photometry and spectroscopy of a HLX candidate associated with the galaxy IC 4320, that reveal it is a background AGN. We discuss the implications of the exclusion of this object from the small number of well-studied HLXs, that appears to accentuate the difference in characteristics between the good IMBH candidate ESO 243-49 HLX-1 and the small handful of other HLXs. ; Comment: 7 pages, 4 figures, accepted for publication in MNRAS