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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/7681
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dc.contributor.authorWalton, D.J.-
dc.contributor.authorHeida, M-
dc.contributor.authorRana, V-
dc.contributor.author+ 17 Co-Authors-
dc.date.accessioned2021-02-17T09:59:33Z-
dc.date.available2021-02-17T09:59:33Z-
dc.date.issued2021-02-
dc.identifier.citationMonthly Notices of the Royal Astronomical Society, 2021, Vol. 501; p.1002-1012en_US
dc.identifier.issn0035-8711-
dc.identifier.issn1365-2966 - (online)-
dc.identifier.urihttp://hdl.handle.net/2289/7681-
dc.descriptionOpen Accessen_US
dc.description.abstractWe report on the discovery of a new, transient ultraluminous X-ray source (ULX) in the galaxy NGC7090. This new ULX, which we refer to as NGC7090 ULX3, was discovered via monitoring with Swift during 2019–2020, and to date has exhibited a peak luminosity of LX ∼ 6 × 1039 erg s−1. Archival searches show that, prior to its recent transition into the ULX regime, ULX3 appeared to exhibit a fairly stable luminosity of LX ∼ 1038 erg s−1. Such strong long-time-scale variability may be reminiscent of the small population of known ULX pulsars, although deep follow-up observations with XMM–Newton and NuSTAR do not reveal any robust X-ray pulsation signals. Pulsations similar to those seen from known ULX pulsars cannot be completely excluded, however, as the limit on the pulsed fraction of any signal that remains undetected in these data is 20 per cent. The broad-band spectrum from these observations is well modelled with a simple thin discmodel, consistent with sub-Eddington accretion, which may instead imply a moderately large black hole accretor (MBH ∼ 40M ). Similarly, though, more complex models consistent with the super-Eddington spectra seen in other ULXs (and the known ULX pulsars) cannot be excluded given the limited signalto- noise ratio of the available broad-band data. The nature of the accretor powering this new ULX therefore remains uncertain.en_US
dc.language.isoenen_US
dc.publisherOxford University Press on behalf of the Royal Astronomical Societyen_US
dc.relation.urihttps://arxiv.org/pdf/2011.08870.pdfen_US
dc.relation.urihttps://doi.org/10.1093/mnras/staa3666en_US
dc.rights2020, The Authoursen_US
dc.subjectstars: black holes – starsen_US
dc.subjectneutron – X-raysen_US
dc.subjectbinaries – X-raysen_US
dc.subjectindividual (NGC 7090 ULX3).en_US
dc.titleA new transient ultraluminous X-ray source in NGC7090en_US
dc.typeArticleen_US
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