http://arxiv.org/abs/1806.07147
We present spectral and timing properties of the newly discovered X-ray transient source, MAXI J1535-571, which is believed to be a Galactic X-ray binary containing a black hole candidate (BHC) as the primary object. After its discovery on 2017 Sep. 2, it has been monitored regularly in multi-wavelength bands with several satellites. We use archival data of Swift (XRT and BAT) and MAXI (GSC) satellite instruments to study accretion flow dynamics of the source during the outburst. During its outburst source became very bright in the sky with maximum observed flux of $5$ Crab in the $2-10$ keV GSC band. Similar to other transient BHCs, it also showed signatures of low frequency quasi-periodic oscillations (QPOs) during the outburst. Spectral data of different instruments are fitted separately or combined with the two-component advective flow (TCAF) model fits file in XSPEC to find direct information on accretion flow properties of the BHC. Evolution of spectral states and their transitions are understood from the model fitted physical flow parameters and nature of QPOs. Our estimated mass of the black hole from spectral analysis turns out to be $7.73-10.0 M_\odot$ or $8.78^{+1.22}{-1.05} M\odot$.
J. Shang, D. Debnath, D. Chatterjee, et. al.
Wed, 20 Jun 18
16/58
Comments: 9 pages, 6 figures, 2 tables (submitted to MNRAS)