Broad-band spectral study of X-ray transient MAXI J1820+070 using Swift/XRT and NuSTAR

Abstract

We report on a \textit{NuSTAR} and \textit{Swift}/XRT observation of the newly discovered X-ray transient MAXI J1820+070. \textit{Swift}/XRT and \textit{NuSTAR} have concurrently observed the newly detected source on 14 March 2018. We have simultaneously fitted the broad-band spectra obtained from \textit{Swift}/XRT and \textit{NuSTAR}. The observed joint spectra in the energy range 0.6--78.0 keV are well modeled with a weak disk black-body emission, dominant thermal Comptonization and relativistic reflection fraction. We have detected a fluorescent Iron-K$\alpha$ line relativistically broadened, and a Compton hump at $\sim$ 30 keV. We constrain the inner disk radius as well as the disk inclination angle and their values are found to be 4.1${}_{-0.6}^{+0.8}$ R${}_{ISCO}$ (where R${}_{ISCO}\equiv$ radius of the innermost stable circular orbit) or 5.1${}_{-0.7}^{+1.0}$ r${}_g$ (where r${}_g\equiv$ gravitational radius) and 29.8${}_{-2.7}^{+3.0}$ ${}^{\circ }$ respectively. The best fit broad-band spectra suggest that the source was in the hard state and evolving. The source emission is best described by weak thermal emission along with strong thermal Comptonization from a relatively cold, optically thick, geometrically thin and ionized accretion disk. X-ray spectral modeling helps us to understand the accretion and ejection properties in the vicinity of the compact object.

arXiv comment07 pages, 05 figures and 02 tables, Accepted for publication by Monthly Notices of the Royal Astronomical Society

References in corpus (35)

• The chemical composition of the Sun
• On the Absorption of X-rays in the Interstellar Medium
• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• X-ray Properties of Black-Hole Binaries
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• The MAXI Mission on the ISS: Science and Instruments for Monitoring All Sky X-Ray Images
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
• Broad iron lines in Active Galactic Nuclei
• Black Hole Spin in X-Ray Binaries: Observational Consequences
• A light bending model for the X-ray temporal and spectral properties of accreting black holes
• Measuring Black Hole Spin using X-ray Reflection Spectroscopy
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• The role of the reflection fraction in constraining black hole spin
• Calibration of the NuSTAR High Energy Focusing X-ray Telescope
• The corona contracts in a black-hole transient
• Stellar-mass Black Hole Spin Constraints from Disk Reflection and Continuum Modeling
• Panchromatic study of GRB 060124: from precursor to afterglow
• Accretion disc variability in the hard state of black hole X-ray binaries
• 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
• ASASSN-18ey: The Rise of a New Black-Hole X-ray Binary
• Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR During its Summer 2015 Outburst
• A Monte Carlo Markov Chain based investigation of black hole spin in the active galaxy NGC3783
• The evolution of GX 339-4 in the low-hard state as seen by NuSTAR and Swift
• New Constraints on the Black Hole Low/Hard State Inner Accretion Flow with NuSTAR
• An in-depth study of a neutron star accreting at low Eddington rate: On the possibility of a truncated disk and an outflow
• Reflection Spectroscopy of the Black Hole Binary XTE J1752-223 in its Long-Stable Hard State
• The return to the hard state of GX 339-4 as seen by Suzaku
• X-ray, Optical, and Near-infrared Monitoring of the New X-ray Transient MAXI J1820+070 in the Low/hard State
• The Innermost Extremes of Black Hole Accretion
• High-redshift blazars through nustar eyes
• MAXI/GSC Discovery of the Black Hole Candidate MAXI J1305-704
• Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}

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• Physical origin of the nonphysical spin evolution of MAXI J1820+070
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• Chasing the break: Tracing the full evolution of a black hole X-ray binary jet with multi-wavelength spectral modeling
• Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
• Evidence for Disk Truncation at Low Accretion States of the Black Hole Binary MAXI J1820+070 Observed by NuSTAR and XMM-Newton
• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
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• Onboard catalogue of known X-ray sources for SVOM/ECLAIRs
• The 2018 outburst of MAXI J1820+070 as seen by Insight-HXMT
• Intermittent QPO properties of MAXI J1820+070 revealed by Insight-HXMT
• Probing thermonuclear bursts and X-ray reflection features in Aql X-1 during 2024 outburst
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