The spin measurement of MAXI J0637-430: a black hole candidate with high disk density

Abstract

The Galactic black hole candidate MAXI J0637-430 was first discovered by $\text{MAXI/GSC}$ on 2019 November 02. We study the spectral properties of MAXI J0637-430 by using the archived $\text{NuSTAR}$ data and $\text{Swift}$/XRT data. After fitting the eight spectra by using a disk component and a powerlaw component model with absorption, we select the spectra with relatively strong reflection components for detailed X-ray reflection spectroscopy. Using the most state-of-art reflection model $\mathtt{relxillCp}$, the spectral fitting measures a black hole spin ${\text{a}}_{\ast }>0.72$ and the inclination angle of the accretion disk $i$ = $46.1_{-5.3}^{+4.0}$ degrees, at 90 per cent confidence level. In addition, the fitting results show an extreme supersolar iron abundance. Combined with the fitting results of the reflection model $reflionx\_hd$, we consider that this unphysical iron abundance may be caused by a very high density accretion disk ( $n_{\mathrm{e}}>2.34\times 10^{21}$ ${\mathrm{cm}}^{-3}$ ) or a strong Fe K$\alpha$ emission line. The soft excess is found in the soft state spectral fitting results, which may be an extra free-free heating effect caused by high density of the accretion disk. Finally, we discuss the robustness of black hole spin obtained by X-ray reflection spectroscopy. The result of relatively high spin is self-consistent with broadened Fe K$\alpha$ line. Iron abundance and disk density have no effect on the spin results.

arXiv commentsubmitted to Research in Astronomy and Astrophysics

References in corpus (48)

• The Swift X-ray Telescope
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• Black Hole Spin in X-Ray Binaries: Observational Consequences
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• Optimal binning of X-ray spectra and response matrix design
• Irradiation of an Accretion Disc by a Jet: General Properties and Implications for Spin Measurements of Black Holes
• The role of the reflection fraction in constraining black hole spin
• X-ray reflected spectra from accretion disk models. I. Constant density atmospheres
• A Parallax Distance to the Microquasar GRS 1915+105 and a Revised Estimate of its Black Hole Mass
• A 15.65 solar mass black hole in an eclipsing binary in the nearby spiral galaxy Messier 33
• The Spin of the Black Hole Microquasar XTE J1550-564 via the Continuum-Fitting and Fe-Line Methods
• Dependence of inner accretion disk stress on parameters: the Schwarzschild case
• X-ray Reflection Spectroscopy of the Black Hole GX 339-4: Exploring the Hard State with Unprecedented Sensitivity
• A Determination of the Spin of the Black Hole Primary in LMC X-1
• Confirmation Via the Continuum-Fitting Method that the Spin of the Black Hole in Cygnus X-1 is Extreme
• NuSTAR Spectroscopy of GRS 1915+105: Disk Reflection, Spin, and Connections to Jets
• The Reflection Component from Cygnus X-1 in the Soft State Measured by NuSTAR and Suzaku
• Alternative explanations for extreme supersolar iron abundances inferred from the energy spectrum of Cygnus X-1
• NuSTAR and Suzaku observations of the hard state in Cygnus X-1: locating the inner accretion disk
• NuSTAR and Swift observations of the very high state in GX 339-4: Weighing the black hole with X-rays
• The Soft State of Cygnus X-1 Observed with NuSTAR: A Variable Corona and a Stable Inner Disk
• X-ray reflected spectra from accretion disk models.II. Diagnostic tools for X-ray observations
• X-ray Spectra from MHD Simulations of Accreting Black Holes
• The Spin of the Black Hole in the Soft X-ray Transient A0620--00
• Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR During its Summer 2015 Outburst
• Reflection Spectra of the Black Hole Binary Candidate MAXI J1535-571 in the Hard State Observed by NuSTAR
• The evolution of GX 339-4 in the low-hard state as seen by NuSTAR and Swift
• Limits on spin determination from disc spectral fitting in GX 339-4
• Re-estimating the Spin Parameter of the Black Hole in Cygnus X-1
• Estimating the black hole spin for the X-ray binary MAXI J1820+070
• Reflection Spectroscopy of the Black Hole Binary XTE J1752-223 in its Long-Stable Hard State
• The spin measurement of the black hole in 4U 1543-47 constrained with the X-ray reflected emission
• Detailed analysis on the reflection component for the black hole candidate MAXI J1348-630
• Spin and Accretion Rate Dependence of Black Hole X-Ray Spectra
• Wideband Study of the Brightest Black Hole X-ray Binary 4U 1543-47 in the 2021 Outburst: Signature of Disk-Wind Regulated Accretion
• The Spin of New Black Hole Candidate: MAXI J1803-298 Observed by NuSTAR and NICER
• NICER observations of the black hole candidate MAXI J0637$-$430 during the 2019-2020 Outburst
• Revealing the nature of the transient source MAXI J0637-430 through spectro-temporal analysis
• Analysis of the reflection spectra of MAXI J1535-571 in the hard and intermediate states
• A detailed study on the reflection component for the Black Hole Candidate MAXI J1836-194
• 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
• Study of the reflection spectra of SAX J1748.9-2021
• Estimating the spin of the black hole candidate MAXI J1659-152 with the X-ray continuum-fitting method
• Emission lines from X-ray illuminated accretion disc in black hole binaries

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