Revealing the nature of the transient source MAXI J0637-430 through spectro-temporal analysis

We study the spectral and temporal properties of MAXI J0637-430 during its 2019-2020 outburst using \textit{NICER}, \textit{AstroSat} and \textit{Swift-XRT} data. The source was in a disc dominant state within a day of its detection and traces out a `c' shaped profile in the HID, similar to the...

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Bibliographic Details
Published in:arXiv.org 2021-10
Main Authors: Baby, Blessy E, Bhuvana, G R, Radhika, D, Katoch, Tilak, Mandal, Samir, Nandi, Anuj
Format: Article
Language:English
Subjects:
Decay
Elastic scattering
Energy spectra
Luminosity
Outbursts
Photons
Quasi-Periodic Oscillations
Online Access:Get full text
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Summary:We study the spectral and temporal properties of MAXI J0637-430 during its 2019-2020 outburst using \textit{NICER}, \textit{AstroSat} and \textit{Swift-XRT} data. The source was in a disc dominant state within a day of its detection and traces out a `c' shaped profile in the HID, similar to the `mini'-outbursts of the recurrent BHB 4U 1630-472. Energy spectrum is obtained in the \(0.5-10\) keV band with \textit{NICER} and \textit{Swift-XRT}, and \(0.5-25\) keV with \textit{AstroSat}. The spectra can be modelled using a multicolour disc emission (\textit{diskbb}) convolved with a thermal Comptonisation component (\textit{thcomp}). The disc temperature decreases from 0.6 keV to 0.1 keV during the decay with a corresponding decrease in photon index (\(\Gamma\)) from 4.6 to 1.8. The fraction of Compton scattered photons (\(f_{cov}\)) remains \(
ISSN:2331-8422
DOI:10.48550/arxiv.2109.08374