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http://hdl.handle.net/20.500.12386/29138
Titolo: | X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070 | Autori: | Kajava, J. J. E. MOTTA, Sara Elisa Sanna, A. Veledina, A. Del Santo, M. SEGRETO, ALBERTO |
Data pubblicazione: | 2019 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 488 | Fascicolo: | 1 | Da pagina:: | 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 |
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