Abstract Details

Affiliation: Senior Research Fellow
Conference ID: ASI2017_1144
Title : Monte-Carlo Simulations of Thermal Comptonization Process in a Two Component Advective Flow around a Neutron Star
Authors and Co-Authors : Ayan Bhattacharjee^{1,*}, Sandip K. Chakrabarti^{1,2} 1. S. N. Bose National Centre for Basic Sciences, Block -JD, Sector -3, Salt Lake, Kolkata 700106, India 2. Indian Center for Space Physics, 43 Chalantika, Garia St. Road, Kolkata 700084, India *Presenting author
Abstract Type : Poster
Abstract Category : Stars,ISM and the Galaxy
Abstract : We study spectral properties of Two-Component Advective Flow (TCAF) around a neutron star. We compute the effects of thermal Comptonization of soft photons emitted from a Keplerian disc and the boundary layer of the neutron star by the post-shock region of a sub-Keplerian flow, formed due to strong centrifugal barrier around the star. The shock location X_s is the inner edge of the Keplerian disc. We compute a series of realistic spectra assuming a set of temperature of the post-shock region T_{CE} , the temperature of the boundary layer T_{NS} and the shock location X_s . These parameters depend on the disc and halo accretion rates (ṁ_d and ṁ_h, respectively) which modulate the resultant spectra. We find that the resultant spectrum becomes harder when ṁ_h is increased. We also study the variation of hard photons flux with the angle of observation.