Abstract Details

Name: SOUMEN MONDAL
Affiliation: JADAVPUR UNIVERSITY KOLKATA
Conference ID: ASI2020_375
Title : Standing and Radiative Shocks in relativistic accretion flows around black holes.
Authors and Co-Authors : Soumen Mondal
Abstract Type : Poster
Abstract Category : Extragalactic Astronomy
Abstract : In the present work, we study the properties of dissipative shocks in a fully relativistic accretion flows around spinning black holes. Harboring a radiative shock in the flow, a significant portion of the thermal and kinetic energy may get released from the post-shock corona. A stellar-mass black hole may therefore emit hard X-rays from the inner edge of the disk. If the bulk energy loss is significant, post-shock pressure drops, and shock moves forward towards the black hole compressing the size of the post-shock corona- results in enhancing the corona temperature and compression ratio. The dynamical properties of the radiative shocks are therefore systematically investigated to understand the radiative loss processes, temporal variations, spectral properties accurately. We notice that the range of flow parameters (e.g. energy and angular momentum) responsible for `shocks in accretion (SA)' are identical for both the standing and dissipative shocks. The spin of the black hole enhances the dissipation further. We estimate the maximum energy release, and notice that it could be as close as 100% of available thermal and kinetic energy in some cases. The implication of this could be profound in explaining various observed phenomenon namely the formation of QPOs and it's systematic evolutions, time lags in between hard and soft X-ray photons (e.g., XTE J1550-564 and GRO J1655-40 etc.) during their outbursts.