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

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 $M_{\odot }$, assuming the source distance of $d<10$ kpc.

14 pages, 11 figures, 1 table. Accepted for publication in MNRAS

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Cited by in corpus (11)

• AstroSat Observation of X-ray Dips and State Transition in the Black Hole Candidate MAXI J1803-298
• Revealing the nature of the transient source MAXI J0637-430 through spectro-temporal analysis
• NuSTAR and Swift Observations of the Extragalactic Black Hole X-ray Binaries
• The peculiar spectral evolution of the new X-ray transient MAXI J0637-430
• A 2-hr binary period for the black hole transient MAXI J0637-430
• Optical polarization signatures of black hole X-ray binaries
• Global Accretion Properties of Black Hole X-Ray Binaries: A Phenomenological Perspective
• Broadband X-ray Spectroscopy and Estimation of Spin of the Galactic Black Hole Candidate GRS 1758-258
• Spectral properties of soft X-ray transient MAXI J0637$-$430 using AstroSat
• The spin measurement of MAXI J0637-430: a black hole candidate with high disk density
• Spectral and Timing Analysis of NuSTAR and Swift/XRT Observations of the X-Ray Transient MAXI J0637-430