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NuSTAR observations of the ultraluminous X-ray source M33 X-8: a black hole in a very high state?
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). Space Research Institute of the Russian Academy of Sciences, Russia; University of Turku, Finland.ORCID iD: 0000-0002-0983-0049
Number of Authors: 42018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 480, no 2, p. 2357-2364Article in journal (Refereed) Published
Abstract [en]

The closest known ultraluminous X-ray source (ULX), M33 X-8, has been recently observed with NuSTAR during its Extragalactic Legacy program, which includes a hard X-ray survey of the M33 galaxy. We present results of two long observations of M33 taken in 2017 March and July, with M33 X-8 in the field of view. The source demonstrates a nearly constant flux during the observations, and its 3-20 keV spectrum can be well described by two distinct components: a standard accretion disc with a temperature of similar to 1 keV at the inner radius and a power law with a photon index Gamma approximate to 3, which is significantly detected up to 20 keV. There is also an indication of a high-energy cut-off in the spectrum, corresponding to a temperature of the Comptonizing medium of greater than or similar to 10 keV. The broad-band spectral properties of M33 X-8 resemble black hole X-ray binaries in their very high states, suggesting that M33 X-8 is a black hole accreting at a nearly Eddington rate, in contrast to super-Eddington accretion believed to take place in more luminous ULXs.

Place, publisher, year, edition, pages
2018. Vol. 480, no 2, p. 2357-2364
Keywords [en]
X-rays: binaries, X-rays: general, X-rays: individual: (M33 X-8)
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-162924DOI: 10.1093/mnras/sty1995ISI: 000449614800072OAI: oai:DiVA.org:su-162924DiVA, id: diva2:1272261
Available from: 2018-12-18 Created: 2018-12-18 Last updated: 2018-12-18Bibliographically approved

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