Relativistic lines in very low luminosity AGN

by Prof. Ari Laor

Technion

at Astrophysics and Cosmology Seminar

Wed, 16 Jun 2021, 11:10
Sacta-Rashi Building for Physics (54), room 207

Abstract

The very low luminosity AGN, NGC 3147, with L/L_Edd = 10^-4, was considered to be a true type 2 AGN, i.e. an AGN which lacks a Broad Line Region (in contrast with regular type 2 AGN, where the BLR is simply obscured). Our recent HST observation managed to exclude the host galaxy light, and revealed that the BLR is actually there, at the expected luminosity and position. The BLR is extremely compact, and indicates a thin disk of cold gas extending down to 77 gravitational radii, which is most likely the accretion disk itself. Such low luminosity AGN are commonly believed to be powered by Advection Dominated Accretion Flows, which form a thick hot dilute gas, in contrast with the observations. Further followups with HST will be briefly described.

Created on 12-06-2021 by Zitrin, Adi (zitrin)
Updaded on 12-06-2021 by Zitrin, Adi (zitrin)