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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29138
Title: X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
Authors: Kajava, J. J. E.
MOTTA, Sara Elisa 
Sanna, A.
Veledina, A.
Del Santo, M. 
SEGRETO, ALBERTO 
Issue Date: 2019
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 488
Issue: 1
First Page: L18
Abstract: 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.
URI: http://hdl.handle.net/20.500.12386/29138
URL: https://academic.oup.com/mnrasl/article-abstract/488/1/L18/5511901?redirectedFrom=fulltext
ISSN: 0035-8711
DOI: 10.1093/mnrasl/slz089
Bibcode ADS: 2019MNRAS.488L..18K
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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