Spectro-timing analysis of MAXI J1535-571 using AstroSat

Journal
Date Issued
2019
Author(s)
Bhargava, Yash
•
•
Bhattacharya, Dipankar
•
Misra, Ranjeev
DOI
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 νQPO fluctuating in the range of 1.7-3.0 Hz. We found a tight correlation between the QPO centroid frequency νQPO and the power-law spectral index Γ, while νQPO appeared not to be correlated with the linearly increasing flux itself. We discuss the implications of these results on physical models of accretion.
Volume
488
Issue
1
Start page
720
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2019MNRAS.488..720B
Rights
open.access
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