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X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
Univ Turku, Finnish Ctr Astron ESO FINCH, FI-20014 Turku, Finland..
Univ Oxford, Dept Phys, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England..
Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0-7, I-09042 Monserrato, Italy..
KTH, Centres, Nordic Institute for Theoretical Physics NORDITA. Univ Turku, Dept Phys & Astron, FI-20014 Turku, Finland.;Stockholm Univ, Roslagstultsbacken 23, SE-10691 Stockholm, Sweden.;Russian Acad Sci, Space Res Inst, Profsoyuznaya Str 84-32, Moscow 117997, Russia..
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2019 (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
OXFORD UNIV PRESS , 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
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-259435DOI: 10.1093/mnrasl/slz089ISI: 000482696200004Scopus ID: 2-s2.0-85068959818OAI: oai:DiVA.org:kth-259435DiVA, id: diva2:1353752
Note

20190924

Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-09-24Bibliographically approved

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Veledina, Alexandra

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