Abstract Details
| Name: SUVENDU RAKSHIT Affiliation: Indian Institute of Astrophysics Conference ID: ASI2016_581 Title : First spatially resolved black hole mass of quasar 3C273 Authors and Co-Authors : Suvendu Rakshit, Romain Petrov, Florentin Millour, SteÌphane Lagarde, Martin Vannier, Alessandro Marconi and Gerd Weigelt Abstract Type : Oral Abstract Category : Extragalactic astronomy Abstract : Understanding the broad line region is critical to understand geometry and kinematics of the central engine, accretion mechanism and to estimate mass of central supermassive black hole (SMBH). Reverberation mapping (RM) estimates SMBH masses using virial relation, which relies on a poorly known scale factor that depends on geometry and kinematic of the BLR. Using “Blind mode observation†at AMBER/VLTI, for the first time it has been possible to resolve the BLR of quasar 3C273 in Pa-alpha. The first result shows a drop in differential visibility indicating an extended BLR much larger than RM prediction. A global fit to the 3C273 data shows that the Pa-alpha BLR is extended beyond the dust inner-rim, which is inclined close to face-on and has a spherical structure, where Keplerian rotation and macro-turbulent velocities have similar contribution. The mass of SMBH in 3C273 is found to be 4.8e8 solar mass and the scale factor to be about 3. |