The hyperluminous X-ray source candidate in IC 4320: another HLX bites the dust
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 photo...
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Veröffentlicht in: | Monthly notices of the Royal Astronomical Society 2015-06, Vol.450 (1), p.787-793 |
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Sprache: | eng |
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Zusammenfassung: | 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. |
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ISSN: | 0035-8711 1365-2966 |
DOI: | 10.1093/mnras/stv505 |