273 citations · 2.2k across the 98 of their papers we have counts for
6 papers · 1 filter
Expansion of radio galaxies in a cosmologically evolving medium: Possible implications for the cosmic star-formation history
Paramita Barai, Gopal-Krishna, M. Angela Osterman +1
We compare earlier estimates of the volumes filled by lobes of radio galaxies during the quasar era based upon non-evolving ambient media with new ones assuming a strong cosmologic…
Do the mildly superluminal VLBI knots exclude ultrarelativistic blazar jets?
Gopal-Krishna, Samir Dhurde, Paul J. Wiita
We compute the effective values of apparent transverse velocity and flux boosting factors for the VLBI radio knots of blazar jets, by integrating over the angular distributions of…
Asymmetries in Powerful Extragalactic Radio Sources
Gopal-Krishna, Paul J. Wiita
This review provides the background and current perspective of some of the striking asymmetries exhibited by extragalactic double-lobed radio sources, paying special attention to t…
Intra-night Optical Variability of BL Lacs, Radio-Quiet Quasars and Radio-Loud Quasars
C. S. Stalin, A. C. Gupta, Gopal-Krishna +2
We report optical monitoring observations of 20 high-luminosity AGN, 12 of which are radio-quiet quasars (RQQs). Intra-night optical variability (INOV) was detected for 13 of the 2…
FUSE search for 10^5-10^6 K gas in the rich clusters of galaxies Abell 2029 and Abell 3112
A. Lecavelier des Etangs, Gopal-Krishna, F. Durret
Recent Chandra and XMM X-ray observations of rich clusters of galaxies have shown that the amount of hot gas which is cooling below ~1 keV is generally more modest than previous es…
Brightness suppression of relativistic radio jets of quasars: The role of the lower electron energy cut-off
Gopal-Krishna, Peter L. Biermann, Paul J. Wiita
Although the possibility of a low energy cut-off (LEC) of the relativistic electron population (E_{min} ~ 0.1 GeV) in the different components of radio galaxies has been discussed…