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X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
Stockholm University, Nordic Institute for Theoretical Physics (Nordita). University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia.
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Number of Authors: 62019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 488, no 1, p. l18-L23Article in journal (Refereed) Published
Abstract [en]

MAXI J1820+070, a black hole candidate first detected in early 2018 March, was observed by XMM-Newton during the outburst rise. In this letter we report on the spectral and timing analysis of the XMM-Newton X-ray and UV data, as well as contemporaneous X-ray data from the Swift satellite. The X-ray spectrum is well described by a hard thermal Comptonization continuum. The XMM-Newton X-ray light curve shows a pronounced dipping interval, and spectral analysis indicates that it is caused by a moderately ionized partial covering absorber. The XMM-Newton/OM U-filter data do not reveal any signs of the 17 h orbital modulation that was seen later on during the outburst decay. The UV/X-ray cross-correlation function shows a complex shape, with a peak at positive lags of about 4 s and a precognition dip at negative lags, which is absent during the X-ray dipping episode. Such shape could arise if the UV emission comes partially from synchrotron self-Compton emission near the black hole, as well as from reprocessing of the X-rays in the colder accretion disc further out.

Place, publisher, year, edition, pages
2019. Vol. 488, no 1, p. l18-L23
Keywords [en]
accretion, accretion discs, black hole physics, X-rays: binaries, X-rays: individual: MAXI J1820+070
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-172971DOI: 10.1093/mnrasl/slz089ISI: 000482696200004OAI: oai:DiVA.org:su-172971DiVA, id: diva2:1351594
Available from: 2019-09-16 Created: 2019-09-16 Last updated: 2019-09-16Bibliographically approved

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