Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS
Date Issued
2020
Author(s)
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Bird, A. J.
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Bodaghee, A.
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Charles, P. A.
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Lepingwell, V. A.
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Ubertini, P.
Abstract
We report on a recent bright outburst from the new X-ray binary transient MAXI J1631-479, observed in January 2019. In particular, we present the 30-200 keV analysis of spectral transitions observed with INTEGRAL/IBIS during its Galactic plane monitoring program. In the MAXI and BAT monitoring period, we observed two different spectral transitions between the high/soft and low/hard states. The INTEGRAL spectrum from data taken soon before the second transition is best described by a Comptonized thermal component with a temperature of kTe ∼ 30 keV and a high-luminosity value of L_{2-200 keV}∼ 3× 10^{38} erg-1 (assuming a distance of 8 kpc). During the second transition, the source shows a hard, power-law spectrum. The lack of high energy cut-off indicates that the hard X-ray spectrum from MAXI J1631-479 is due to a non-thermal emission. Inverse Compton scattering of soft X-ray photons from a non-thermal or hybrid thermal/non-thermal electron distribution can explain the observed X-ray spectrum although a contribution to the hard X-ray emission from a jet cannot be determined at this stage. The outburst evolution in the hardness-intensity diagram, the spectral characteristics, and the rise and decay times of the outburst are suggesting that this system is a black hole candidate.
Volume
492
Issue
3
Start page
3657
Issn Identifier
0035-8711
Ads BibCode
2020MNRAS.492.3657F
Rights
open.access
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