15 citations · 19 across the 7 of their papers we have counts for
12 papers · 1 filter
Influence of the jet opening angle on the derived kinematical parameters of blazar jets having uniform and stratified bulk motion
Gopal-Krishna, Samir Dhurde, Pronoy Sircar +1
We present analytical modelling of conical relativistic jets, in order to evaluate the role of the jet opening angle on certain key parameters that are inferred from VLBI radio obs…
Effects of Jet Opening Angle and Velocity Structure on Blazar Parameters
Paul J. Wiita, Gopal-Krishna, Samir Dhurde +1
We had earlier shown that for a constant velocity jet the discrepancy between the low speeds indicated by VLBI knot motions and the high Doppler factors inferred from emission of T…
Further evidence for intra-night optical variability of radio-quiet quasars
A. Goyal, Gopal-Krishna, Ram Sagar +2
Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily sin…
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…
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…
Radio Galaxies and the Magnetization of the IGM
Gopal-Krishna, Paul J. Wiita
Observed radio galaxies had a much higher comoving density during the `quasar era', at z ~ 2-3, but these sources are only detectable for small fractions of their active lifetimes…