List today's talk

[ref id: 318] Topic: The effect of black hole spin on accretion solutions around black holes

Speaker: Indranil Chattopadhyay
Affiliation: ARIES
Date (yyyy-mm-dd): 2018-02-20
Time: 16:30hr
Venue: Auditorium

Abstract: In this presentation, we study the accretion disc in full general relativity, in presence of dissipative proceses like viscosity. Treating viscous stress tensor in general relativity is tricky affair. The thermodynamics of the fluid of the accretion disc is described by a relativistic equation of state, which is inspired by Chandrasekhar equation of state. We present a novel way to find all possible accretion disc solutions in the advection regime. We also study the effect of spin of the black hole in determining the accretion solutions. We comment on the possibility of formation of bipolar jets, and how they are affected by viscosity parameter and the spin of the black hole. We also outline the possible effects, various radiative cooling processes may have on accretion solutions.


About Speaker: Scientist E


[ref id: 317] Topic: Compton heating of astrophysical jets and observed brightness temperature of radio loud AGN

Speaker: Mukesh Vyas
Affiliation: ARIES
Date (yyyy-mm-dd): 2018-02-20
Time: 15:30hr
Venue: Auditorium

Abstract: We investigate effects of radiation from accretion disc onto relativistic jets in general relativistic regime. We obtain that the jets are not only kinetically driven under intense radiation field but also the energy exchange between radiation and matter leads to heating of jets that may increase the temperature of the plasma by several orders up to 10^11K. The temperature depends on luminosity of the disc. We also obtain a relation between the disc luminosity and obtained upper limit of the temperature and compare the results with various observed radio loud sources. Apart from this the Compton driving in jets leads to internal shocks. We also discuss the impact of these shocks and terminal Lorentz factors of the jets.


About Speaker: Mukesh is SRF in ARIES. This is a part of Tuesday Seminar