273 citations · 2.2k across the 98 of their papers we have counts for
7 papers · 1 filter
Radio emission and the optical isophotal twist of radio-loud ellipticals
Gopal-Krishna, Amit R. Dhakulkar, Paul J. Wiita +1
Using the surface photometric analysis data for a well defined sample of 79 nearby radio galaxies (z < 0.12), it is shown that the level of radio emission associated with an ellipt…
The Origin of X-shaped Radio Galaxies: Clues from the Z-symmetric Secondary Lobes
Gopal-Krishna, Peter L. Biermann, Paul J. Wiita
Existing radio images of a few X-shaped radio galaxies reveal Z-symmetric morphologies in their weaker secondary lobes which cannot be naturally explained by either the galactic me…
Optical variability properties of high luminosity AGN classes
C. S. Stalin, Gopal-Krishna, Ram Sagar +1
We present the results of a comparative study of the intra-night optical variability (INOV) characteristics of radio-loud and radio-quiet quasars, which involves a systematic intra…
Intranight optical variability of radio-quiet and radio lobe dominated quasars
C. S. Stalin, Gopal-Krishna, Ram Sagar +1
We present results of a programme of multi-epoch, intra-night optical monitoring of a sample of non-blazar type AGN, which includes seven radio-quiet QSOs (RQQs) and an equal numbe…
Intranight optical variability of Blazars
Ram Sagar, C. S. Stalin, Gopal-Krishna +1
We present results of a multi-epoch intra-night optical monitoring of eleven blazars consisting of six BL Lac objects and five radio core-dominated quasars (CDQs). These densely sa…
Clear Evidence for Intranight Optical Variability in Radio-quiet Quasars
Gopal-Krishna, C. S. Stalin, Ram Sagar +1
We present new clues to the problem of the radio loudness dichotomy arising from an extensive search for intranight optical variability in seven sets of optically luminous radio-qu…