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http://hdl.handle.net/20.500.12386/28762
Title: | Spectro-timing analysis of MAXI J1535-571 using AstroSat | Authors: | Bhargava, Yash BELLONI, Tomaso Maria Melchiorre Bhattacharya, Dipankar Misra, Ranjeev |
Issue Date: | 2019 | Journal: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Number: | 488 | Issue: | 1 | First Page: | 720 | Abstract: | We report the results of the analysis of an AstroSat observation of the black hole candidate MAXI J1535-571 during its hard-intermediate state. We studied the evolution of the spectral and timing parameters of the source during the observation. The observation covered a period of ∼5 d and consisted of 66 continuous segments, corresponding to individual spacecraft orbits. Each segment was analysed independently. The source count rate increased roughly linearly by ∼30 per cent. We modelled the spectra as a combination of radiation from a thermal disc component and a power law. The timing analysis revealed the presence of strong quasi-periodic oscillations with centroid frequency ν<SUB>QPO</SUB> fluctuating in the range of 1.7-3.0 Hz. We found a tight correlation between the QPO centroid frequency ν<SUB>QPO</SUB> and the power-law spectral index Γ, while ν<SUB>QPO</SUB> appeared not to be correlated with the linearly increasing flux itself. We discuss the implications of these results on physical models of accretion. | URI: | http://hdl.handle.net/20.500.12386/28762 | URL: | https://academic.oup.com/mnras/article/488/1/720/5525097 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stz1774 | Bibcode ADS: | 2019MNRAS.488..720B | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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makij1535.pdf | PDF editoriale | 3.65 MB | Adobe PDF | View/Open |
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