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

Sutton, A.D.; Roberts, T.P.; Gladstone, J.C.; Walton, D.J.

doi:10.1093/mnras/stv505

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

Sutton, A.D.; Roberts, T.P.; Gladstone, J.C.; Walton, D.J.

Authors

A.D. Sutton

Professor Tim Roberts t.p.roberts@durham.ac.uk
Professor

J.C. Gladstone

D.J. Walton

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.

Citation

Sutton, A., Roberts, T., Gladstone, J., & Walton, D. (2015). The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust. Monthly Notices of the Royal Astronomical Society, 450(1), 787-793. https://doi.org/10.1093/mnras/stv505

Journal Article Type	Article
Acceptance Date	Mar 4, 2015
Publication Date	Jun 11, 2015
Deposit Date	Apr 30, 2015
Publicly Available Date	May 6, 2015
Journal	Monthly Notices of the Royal Astronomical Society
Print ISSN	0035-8711
Electronic ISSN	1365-2966
Publisher	Royal Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	450
Issue	1
Pages	787-793
DOI	https://doi.org/10.1093/mnras/stv505
Keywords	Accretion, Accretion discs, Black hole physics, X-rays: binaries, X-rays: galaxies.
Related Public URLs	http://arxiv.org/abs/1503.01711

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This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society All rights reserved.