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Published June 11, 2015 | Version Submitted + Published
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The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust

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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 an 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.

Additional Information

© 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2015 March 4; received 2015 March 3; in original form 2014 October 27; first published online April 21, 2015. ADS and TPR acknowledge funding from the Science and Technology Facilities Council as part of the consolidated grants ST/K000861/1 and ST/L00075X/1. This work is based on observations made with ESO telescopes at the La Silla Paranal Observatory under programme IDs 090.D-0300(A) and 092.D-0212(A). It is also based in part on observations made by the Chandra X-ray Observatory, and made use of data supplied by the UK Swift Science Data Centre at the University of Leicester.

Attached Files

Published - MNRAS-2015-Sutton-787-93.pdf

Submitted - 1503.01711v1.pdf

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1503.01711v1.pdf

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Additional details

Identifiers

Eprint ID
58852
Resolver ID
CaltechAUTHORS:20150710-133728608

Related works

Describes
http://arxiv.org/abs/1503.01711 (URL)

Funding

Science and Technology Facilities Council (STFC)
ST/K000861/1
Science and Technology Facilities Council (STFC)
ST/L00075X/1

Dates

Created
2015-07-10
Created from EPrint's datestamp field
Updated
2021-11-10
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