A5032950119- Astrophysical Phenomena and Observations
- Pulsars and Gravitational Waves Research
- Mechanics and Biomechanics Studies
- Astrophysics and Cosmic Phenomena
- Particle Accelerators and Free-Electron Lasers
- Relativity and Gravitational Theory
National Astronomical Observatories
2020-2023
Chinese Academy of Sciences
2020-2023
University of Chinese Academy of Sciences
2020-2023
Center for Astrophysics Harvard & Smithsonian
2023
Marshall Space Flight Center
2002
Cygnus X-1 is a well-studied persistent black hole X-ray binary. Recently, the three parameters needed to estimate spin of this system, namely mass $M$, orbital inclination $i$ and source distance $D$, have been updated. In work we redetermine parameter using continuum-fitting technique for those updated values. Based on assumption that axis aligned with plane, fit thermal disk component fully relativistic thin accretion model. The error in arising from combined observational uncertainties...
The black hole candidate MAXI J1348-630 was discovered on January 26th, 2019, with the Gas Slit Camera (GSC) on-board \textit{MAXI}. We report a detailed spectral analysis of this source by using archived data \textit{NuSTAR}. A total 9 observations covered complete outburst evolution from hard state to soft and finally back state. Additionally, intermediate is found in transition use state-of-art reflection model \verb'relxill' family fit all spectra, spectra two focal plane module...
MAXI J1803-298, a newly-discovered Galactic transient and black hole candidate, was first detected by \emph{MAXI}/GSC on May 1st, 2021. In this paper, we present detailed spectral analysis of J1803-298. Utilizing the X-ray reflection fitting method, perform joint fit to spectra respectively, observed \emph{NuSTAR} \emph{NICER}/XTI same day over energy range between 0.7-79.0 keV, found its spin (and inclination angle i) can be constrained close an extreme value, 0.991 ($i\sim$ $70 ^{\circ}$),...
ABSTRACT We report the results of fitting Insight-HXMT data to black hole X-ray binary MAXI J1348-430, which was discovered on January 26th, 2019, also inferred ionization state and iron abundancewith Gas Slit Camera on-board MAXI. Several observations at beginning first burst were selected, with a total 10 spectra. From residuals fits using disc plus power-law models, reflection signatures clearly visible in some these observations. use state-of-the-art $\tt {relxill}$ series model fit six...
As a transient X-ray binary, MAXI J1659-152 contains black hole candidate as its compact star. was discovered on 2010 September 25 during only known outburst. Previously-published studies of this outburst indicate that may have an extreme retrograde spin, which, if confirmed, would provide important clue to the origin spin. In paper, utilizing updated dynamical binary-system parameters (i.e. mass, orbital inclination and source distance) provided by \cite{Torres2021}, we analyze 65 spectra...
ABSTRACT MAXI J1305–704 is a transient X-ray binary with black hole primary. It was discovered on 2012 April 9, during its only known outburst. also high inclination low-mass prominent dip features in light curves, so we check the full catalogue of 92 Swift/XRT continuous observations J1305–704, focusing stable spectra. We select 13 ‘gold’ spectra for which rms <0.075 and coronal scattered fraction $f_{\mathrm{sc}} \lesssim 25$ per cent. These data are optimal thermal-state...
The Galactic black hole candidate MAXI J0637-430 was first discovered by $\textit{MAXI/GSC}$ on 2019 November 02. We study the spectral properties of using archived $\textit{NuSTAR}$ data and $\textit{Swift}$/XRT data. After fitting eight spectra a disk component powerlaw model with absorption, we select relatively strong reflection components for detailed X-ray spectroscopy. Using most state-of-art $\tt{relxillCp}$, measures spin $\textit{a}_{\rm{*}} > 0.72$ inclination angle accretion $i$...
Abstract MAXI J1820+070 is a newly discovered black hole X-ray binary, whose dynamical parameters, namely the mass, inclination angle, and source distance, have recently been estimated. Insight-HXMT observed its entire outburst from 2018 March 14. In this work, we attempted to estimate spin parameter * , using continuum-fitting method applying fully relativistic thin disk model soft-state spectra obtained by Insight-HXMT. It well known that strongly dependent on three parameters in method,...
Abstract We present our analysis of MAXI J1813−095 during its hard state “stalled” outburst in 2018. This self-consistent has been carried out using the Neutron Star Interior Composition Explorer, Swift, Chandra, and NuSTAR throughout seven observations J1813−095. find a relativistic iron line at ∼6.5 keV from inner region accretion disk. Our results are consistent with slightly truncated disk or nontruncated for an radius ∼2 R g minimum spin >0.7 best value ∼0.9, assuming reaches...
The Galactic black hole candidate MAXI J0637-430 was first discovered by $\textit{MAXI/GSC}$ on 2019 November 02. We study the spectral properties of using archived $\textit{NuSTAR}$ data and $\textit{Swift}$/XRT data. After fitting eight spectra a disk component powerlaw model with absorption, we select relatively strong reflection components for detailed X-ray spectroscopy. Using most state-of-art $\tt{relxillCp}$, measures spin $\textit{a}_{\rm{*}} > 0.72$ inclination angle accretion...
We report the results of fitting Insight-HXMT data to black hole X-ray binary MAXI J1348-430, which was discovered on January 26th, 2019, with Gas Slit Camera (GSC) on-board MAXI. Several observations at beginning first burst were selected, a total 10 spectra. From residuals fits using disk plus power law models, reflection signatures clearly visible in some these observations. use state-of the-art relxill series model fit six spectra distinct and joint In particular, we focus for spin...