New Galactic Black Hole Candidate MAXI J1535-571 : Analysis with the TCAF model
Abstract
Recently discovered X-ray transient Galactic black hole candidate MAXI J1535-571 has been studied during its very first outburst after discovery using archival data of Swift XRT & BAT instruments. Maximum X-ray flux in 0.3-10 keV band is observed to rise by a factor of 25 times as in the quiescent state, which was 4 Crab. Using the combined Swift XRT & BAT observations, accretion flow properties during the 2017 outburst are studied from spectral fits with the Two-Component Advective Flow (TCAF) model fits file in XSPEC. We observed significant double Iron emission lines at around 6.5 keV in the spectra. Sharp type-C QPOs are also detected both in the raising as well as declining phases of the outburst. The monotonic evolution of the frequency of the dominating QPOs are studied with the propagating oscillatory shock (POS) model, to have estimation of the instantaneous locations, strength, velocity etc. of the propagating shock wave. The POS model fitted shock parameters are found to be consistent with the TCAF model fitted spectral (shock) parameters. We also estimate mass of the black hole to be 10 solar masses from our TCAF model fitted spectral analysis.
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E3070S