Broadband Spectral properties of MAXI J1348--630 using AstroSat Observations by Gitika Mall et al. on Monday 21 November
We present broadband X-ray spectral analysis of the black hole X-ray binary
MAXI J1348--630, performed using five AstroSat observations. The source was in
the soft spectral state for the first three and in the hard state for the last
two observations. The three soft state spectra were modelled using a
relativistic thin accretion disc with reflection features and thermal
Comptonization. Joint fitting of the soft state spectra constrained the spin
parameter of the black hole $a_*$ $>$ 0.97 and the disc inclination angle $i$ =
32.9$\substack{+4.1 \\ -0.6}$ degrees. The bright and faint hard states had
bolometric flux a factor of $\sim 6$ and $\sim 10$ less than that of the soft
state. Their spectra were fitted using the same model except that the inner
disc radius was not assumed to be at the last stable orbit. However, the
estimated values do not indicate large truncation radii and the inferred
accretion rate in the disc was an order of magnitude lower than that of the
soft state. Along with earlier reported temporal analysis, AstroSat data
provides a comprehensive picture of the evolution of the source.
arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.11431v1
