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Intranight Optical Variability of Radio-Quiet Weak Emission Line Quasars
Gopal-Krishna, Ravi Joshi, Hum Chand
Based on a recently started programme, we report the first search for intranight optical variability among radio-quiet weak-line-quasars (RQWLQs). Eight members of this class were…
Incidence of Mg II absorption systems towards flat-spectrum radio quasars
Hum Chand, Gopal-Krishna
The conventional wisdom that the rate of incidence of Mg II absorption systems, dN/dz (excluding `associated systems' having velocity beta*c relative to the AGN of less than ~5000…
Intra-night optical variability of core dominated radio quasars: the role of optical polarization
Arti Goyal, Gopal-Krishna, Paul J. Wiita +4
{Abridged} Rapid variations in optical flux are seen in many quasars and all blazars. The amount of variability in different classes of Active Galactic Nuclei has been studied exte…
Radio continuum emission and HI gas accretion in the NGC 5903/5898 compact group of early-type galaxies
Gopal-Krishna, Mukul Mhaskey, Paul J. Wiita +3
We discuss the nature of the multi-component radio continuum and HI emission associated with the nearby galaxy group comprised of two dominant ellipticals, NGC 5898 and NGC 5903, a…