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Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS

Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS
Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS
We report on a recent bright outburst from the new X-ray binary transient MAXIJ1631-479, 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 Comptonised thermal component with a temperature of kTe ~ 30 keV and a high luminosity value of L2-200 keV ~ 3×1038 erg s-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 this system is a black hole candidate.
Binaries, Black holes, Individual:MAXI J1631-479, Neutron, Non-thermal, Radiationmechanisms, Stars, Stars, Stars, X-rays
0035-8711
3657-3661
Fiocchi, M.
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Onori, F.
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Bazzano, A.
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Bird, Antony
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Bodaghee, A.
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Charles, P.A.
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Lepingwell, V.A.
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Malizia, A.
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Masetti, N.
f1e72347-d8e6-4b93-a75f-1eebed379e4b
Natalucci, L.
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Ubertini, P.
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Fiocchi, M.
7d7cb0df-e946-4e21-94d4-043b0952c512
Onori, F.
6d549b2e-6554-4e8f-9e2c-b8dfcc9d67e3
Bazzano, A.
8eef0c6e-1a5f-4bcd-a034-9a5c3b29104d
Bird, Antony
045ee141-4720-46fd-a412-5aa848a91b32
Bodaghee, A.
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Charles, P.A.
d5455124-99b9-4b25-87c9-9fd66b487e24
Lepingwell, V.A.
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Malizia, A.
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Masetti, N.
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Natalucci, L.
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Ubertini, P.
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Fiocchi, M., Onori, F., Bazzano, A., Bird, Antony, Bodaghee, A., Charles, P.A., Lepingwell, V.A., Malizia, A., Masetti, N., Natalucci, L. and Ubertini, P. (2020) Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL/IBIS. Monthly Notices of the Royal Astronomical Society, (3), 3657-3661. (doi:10.1093/mnras/staa068).

Record type: Article

Abstract

We report on a recent bright outburst from the new X-ray binary transient MAXIJ1631-479, 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 Comptonised thermal component with a temperature of kTe ~ 30 keV and a high luminosity value of L2-200 keV ~ 3×1038 erg s-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 this system is a black hole candidate.

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Evolution of MAXI J1631-479 during the January 2019 outburst observed by INTEGRAL IBIS - Accepted Manuscript
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Accepted/In Press date: 6 January 2020
e-pub ahead of print date: 11 January 2020
Additional Information: arXiv is AM
Keywords: Binaries, Black holes, Individual:MAXI J1631-479, Neutron, Non-thermal, Radiationmechanisms, Stars, Stars, Stars, X-rays

Identifiers

Local EPrints ID: 439445
URI: http://eprints.soton.ac.uk/id/eprint/439445
ISSN: 0035-8711
PURE UUID: da8a383f-3d85-4480-a0d4-0d4e8176e76f
ORCID for Antony Bird: ORCID iD orcid.org/0000-0002-6888-8937

Catalogue record

Date deposited: 23 Apr 2020 16:33
Last modified: 26 Nov 2021 02:36

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Contributors

Author: M. Fiocchi
Author: F. Onori
Author: A. Bazzano
Author: Antony Bird ORCID iD
Author: A. Bodaghee
Author: P.A. Charles
Author: V.A. Lepingwell
Author: A. Malizia
Author: N. Masetti
Author: L. Natalucci
Author: P. Ubertini

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