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http://hdl.handle.net/20.500.12386/24747
Titolo: | Swift reveals the eclipsing nature of the high-mass X-ray binary IGR J16195-4945 | Autori: | CUSUMANO, GIANCARLO LA PAROLA, VALENTINA SEGRETO, ALBERTO D'AI', ANTONINO |
Data pubblicazione: | 2016 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 456 | Fascicolo: | 3 | Da pagina:: | 2717 | Abstract: | IGR J16195-4945 is a hard X-ray source discovered by INTEGRAL during the Core Programme observations performed in 2003. We analysed the X-ray emission of this source exploiting the Swift-Burst Alert Telescope (BAT) survey data from 2004 December to 2015 March, and all the available Swift-X-ray Telescope (XRT)-pointed observations. The source is detected at a high significance level in the 123-month BAT survey data, with an average 15-150 keV flux of the source of ∼1.6 mCrab. The timing analysis on the BAT data reveals with a significance higher than six standard deviations the presence of a modulated signal with a period of 3.945 d, that we interpret as the orbital period of the binary system. The folded light curve shows a flat profile with a narrow full eclipse lasting ∼3.5 per cent of the orbital period. We requested phase-constrained XRT observations to obtain a more detailed characterization of the eclipse in the soft X-ray range. Adopting reasonable guess values for the mass and radius of the companion star, we derive a semimajor orbital axis of ∼ 31 R<SUB>☉</SUB>, equivalent to ∼1.8 times the radius of the companion star. From these estimates and from the duration of the eclipse, we derive an orbital inclination between 55 and 60 deg. The broad-band time-averaged XRT+BAT spectrum is well modelled with a strongly absorbed flat power law, with absorbing column N<SUB>H</SUB> = 7 × 10<SUP>22</SUP> cm<SUP>-2</SUP> and photon index Γ = 0.5, modified by a high energy exponential cutoff at E<SUB>cut</SUB> = 14 keV. | URI: | http://hdl.handle.net/20.500.12386/24747 | URL: | https://academic.oup.com/mnras/article/456/3/2717/1100850 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv2851 | Bibcode ADS: | 2016MNRAS.456.2717C | Fulltext: | open |
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