Speaker
Prof.
GOPAL KRISHNA
(ARIES, Nainital)
Description
The talk will mainly focus on the variability patterns of active galactic nuclei (AGN), specially their subset (including quasars, BL Lacs, Seyfert galaxies) which manifests nuclear jets of nonthermal radiation boosted due to relativistic beaming. Many of their striking observational traits, particularly intensity variations have been extensively recorded across the electromagnetic spectrum, on time scales ranging from sub-minute to decades. In contrast, observations of structural changes in their nuclear jets are almost entirely limited to the radio/millimetre waveband, since there alone do we have the capability to image the parsec-scale nuclear structure of AGN. The existing vast amounts of observational material has revealed several interesting trends which contribute richly to the theoretical modeling of the AGN phenomenon. We shall highlight a selection of them and discuss how these intriguing results can be probed deeper using the optical telescopes recently established at Devasthal (Nainital), in addition to the studies using the existing large telescopes operating in the radio and high-energy bands.
Primary author
Prof.
GOPAL KRISHNA
(ARIES, Nainital)
Co-authors
Prof.
PAUL, J. WIITA
(TCNJ, Princeton)
Dr
SILKE BRITZEN
(MPIfR, Bonn)
