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X-ray dips and a co...
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Kajava, J. J. E.Univ Turku, Finnish Ctr Astron ESO FINCH, FI-20014 Turku, Finland.
(author)
X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
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Publisher, publication year, extent ...
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2019-06-06
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OXFORD UNIV PRESS,2019
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printrdacarrier
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LIBRIS-ID:oai:DiVA.org:kth-259435
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https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-259435URI
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https://doi.org/10.1093/mnrasl/slz089DOI
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https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-172971URI
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Language:English
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Summary in:English
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Subject category:ref swepub-contenttype
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Subject category:art swepub-publicationtype
Notes
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20190924
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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.
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Motta, S. E.Univ Oxford, Dept Phys, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England.
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Sanna, A.Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0-7, I-09042 Monserrato, Italy.
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Veledina, AlexandraStockholms universitet,KTH,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.,Nordiska institutet för teoretisk fysik (Nordita),University of Turku, Finland; Space Research Institute of the Russian Academy of Sciences, Russia(Swepub:su)avele
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Del Santo, M.IASF Palermo, Ist Nazl Astrofis, Via U La Malfa 153, I-90146 Palermo, Italy.
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Segreto, A.IASF Palermo, Ist Nazl Astrofis, Via U La Malfa 153, I-90146 Palermo, Italy.
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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.
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Related titles
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In:Monthly notices of the Royal Astronomical Society: OXFORD UNIV PRESS488:1, s. L18-L230035-87111365-29661745-39251745-3933
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