Indranil Chattopadhyay Aryabhatta Research Institute of observational sciencES AAPCOS'15, Kolkata, 17 October, 2015 General relativistic viscous accretion disc and generation of bipolar jets Content of Presentation AAPCOS'15, Kolkata, 17 October, 2015 Phenomenology of accretion-ejection system in black holes (BH) candidates. General relativistic flow around BHs. Importance of relativistic EoS of fluid around BH Results Collaborators Rajiv Kumar (ARIES ) AAPCOS'15, Kolkata, 17 October, 2015 AGNs (centres of Active galaxy) and micro( )-quasars (X-ray binaries) are believed to be powered by accretion onto BH! AGNs & -quasars also show relativistic jets coming out of these objects. 1. Phenomena of accretion & ejection from BH-candidates NGC426 (Hubble) GRS (NRAO) Jet from VELA pulsar (Chandra) BH NS AAPCOS'15, Kolkata, 17 October, contd Accretion being convergent flow is hotter emits from optical to way up in gamma rays. Jets being cooler generally emits in radio. Accretion discs are observed in `hard and `soft spectral state connected by many intermediate states. Low-hard state or LS; High soft state or HS; Intermediate state IM AAPCOS'15, Kolkata, 17 October, contd Jets are observed only in `hard and hard intermediate states and not in the soft state. Fender,Beloni, 2004, ARA&A Mirabel & Rodriguez, 1999, Nature AAPCOS'15, Kolkata, 17 October, contd The jet originates very close to the horizon (0.2c, in pNp jets are much weaker. (2) This promises even higher speeds for Kerr BH, moreover the jet geometry is dimpled towards the axis, which might prefer intrinsic non-steady shocks. Which is good news since much of the phenomenology of Blazars etc are explained by travelling shocks. (3) The mass outflow rate is maximum around 4.5% of inflow rate in pNp it may go as high as 10%. (4) Accretion solution generates all possible solutions, starting from ADAF to shocked accretion disc, the latter can automatically fire mildly-relativistic jets. AAPCOS'15, Kolkata, 17 October, 2015 Thank You