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NICER observations of the black hole candidate MAXI J0637-430 during the 2019-2020 outburst

NICER observations of the black hole candidate MAXI J0637-430 during the 2019-2020 outburst
NICER observations of the black hole candidate MAXI J0637-430 during the 2019-2020 outburst
We present detailed timing and spectral studies of the black hole candidate MAXI J0637−430 during its 2019-2020 outburst using observations with the {\em Neutron Star Interior Composition Explorer (NICER)} and the {\em Neil Gehrels Swift Observatory}. We find that the source evolves through the soft-intermediate, high-soft, hard-intermediate and low-hard states during the outburst. No evidence of quasi-periodic oscillations is found in the power density spectra of the source. Weak variability with fractional rms amplitude <5% is found in the softer spectral states. In the hard-intermediate and hard states, high variability with the fractional rms amplitude of >20% is observed. The 0.7−10 keV spectra with {\em NICER} are studied with a combined disk-blackbody and nthcomp model along with the interstellar absorption. The temperature of the disc is estimated to be 0.6 keV in the rising phase and decreased slowly to 0.1 keV in the declining phase. The disc component was not detectable or absent during the low hard state. From the state-transition luminosity and the inner edge of the accretion flow, we estimate the mass of the black hole to be in the range of 5−12 M⊙, assuming the source distance of d<10 kpc
0035-8711
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b

Altamirano, Diego (2021) NICER observations of the black hole candidate MAXI J0637-430 during the 2019-2020 outburst. Monthly Notices of the Royal Astronomical Society, 504 (4). (doi:10.1093/mnras/stab1231).

Record type: Article

Abstract

We present detailed timing and spectral studies of the black hole candidate MAXI J0637−430 during its 2019-2020 outburst using observations with the {\em Neutron Star Interior Composition Explorer (NICER)} and the {\em Neil Gehrels Swift Observatory}. We find that the source evolves through the soft-intermediate, high-soft, hard-intermediate and low-hard states during the outburst. No evidence of quasi-periodic oscillations is found in the power density spectra of the source. Weak variability with fractional rms amplitude <5% is found in the softer spectral states. In the hard-intermediate and hard states, high variability with the fractional rms amplitude of >20% is observed. The 0.7−10 keV spectra with {\em NICER} are studied with a combined disk-blackbody and nthcomp model along with the interstellar absorption. The temperature of the disc is estimated to be 0.6 keV in the rising phase and decreased slowly to 0.1 keV in the declining phase. The disc component was not detectable or absent during the low hard state. From the state-transition luminosity and the inner edge of the accretion flow, we estimate the mass of the black hole to be in the range of 5−12 M⊙, assuming the source distance of d<10 kpc

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NICER observations of the black hole candidate MAXI J0637-430 during the 2019-2020 outburst - Accepted Manuscript
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e-pub ahead of print date: 3 April 2021
Additional Information: arxiv is am

Identifiers

Local EPrints ID: 450304
URI: http://eprints.soton.ac.uk/id/eprint/450304
ISSN: 0035-8711
PURE UUID: 7a03763a-f180-44ec-a1e8-f9393e53dda3
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 21 Jul 2021 16:31
Last modified: 22 Jul 2021 01:44

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