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X-ray dips and a co...
X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
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- Kajava, J. J. E. (author)
- Univ Turku, Finnish Ctr Astron ESO FINCH, FI-20014 Turku, Finland.
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- Motta, S. E. (author)
- Univ Oxford, Dept Phys, Astrophys, Denys Wilkinson Bldg,Keble Rd, Oxford OX1 3RH, England.
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- Sanna, A. (author)
- Univ Cagliari, Dipartimento Fis, SP Monserrato Sestu Km 0-7, I-09042 Monserrato, Italy.
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- Veledina, Alexandra (author)
- Stockholms 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
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- Del Santo, M. (author)
- IASF Palermo, Ist Nazl Astrofis, Via U La Malfa 153, I-90146 Palermo, Italy.
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- Segreto, A. (author)
- 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. (creator_code:org_t)
- 2019-06-06
- 2019
- English.
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In: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 488:1, s. L18-L23
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Abstract
Subject headings
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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.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences (hsv//eng)
Keyword
- accretion
- accretion discs
- black hole physics
- X-rays: binaries
- X-rays: individual: MAXI J1820+070
Publication and Content Type
- ref (subject category)
- art (subject category)
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