Name: Shivangi Pandey
Affiliation: Aryabhatta Research Institute of Observational Sciences,Nainital
Conference ID : ASI2022_419
Title : Broad-Line Region and Black-hole Mass of PKS 0736+017
Authors : Suvendu Rakshit
Abstract Type: Poster
Abstract Category : Extragalactic Astronomy
Abstract : To understand the mass distribution and co-evolution of a supermassive black hole with its host galaxy, it is crucial to measure the black hole mass of AGN. Blackhole masses can be dynamically measured for local AGNs, however, extremely challenging beyond the local volume due to the requirement of high spatial resolution. Spectroscopic reverberation mapping is a unique tool to estimate black hole masses and study the geometry and kinematics of the broad-line region (BLR) surrounding the black hole. We performed spectroscopic reverberation using long-term monitoring data of a radio-loud quasar PKS 0736+01 which shows strong Hβ, Fe II, and Hγ emission lines in the optical spectrum. The Black Hole mass and size of the Broad Line Region for this source were estimated for the very first time, by decomposition of the optical spectrum into continuum and emission lines to generate the lightcurves of 5100Å continuum flux (f 5100), Hβ, and Hγ. The cross-correlation method, JAVELIN was used to estimate the size of the BLR and black hole mass was measured using virial relation. The source closely follows the BLR size-luminosity relation of AGNs, however, along with thermal radiation from the accretion disk, non-thermal emission from the jet also contributes to the observed luminosity at 5100Å.