273 citations · 2.2k across the 98 of their papers we have counts for
9 papers · 1 filter
Optical variability of radio-intermediate quasars
Arti Goyal, Gopal-Krishna, S. Joshi +4
We report the results of our intensive intranight optical monitoring of 8 `radio-intermediate quasars' (RIQs) having flat or inverted radio spectra. The monitoring was carried out…
A giant radio jet of very unusual polarization in a single-lobed radio galaxy
Joydeep Bagchi, Gopal-Krishna, Marita Krause +2
We report the discovery of a very unusual, predominantly one-sided radio galaxy CGCG049-033. Its radio jet, the largest detected so far, emits strongly polarized synchrotron radiat…
Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time scale
Arti Goyal, Gopal-Krishna, G. C. Anupama +6
We present the result of our extensive intranight optical monitoring of the well known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of -…
A diffuse bubble-like radio-halo source MRC 0116+111: imprint of AGN feedback in a low-mass cluster of galaxies
Joydeep Bagchi, Joe Jacob, Gopal-Krishna +4
We present detailed observations of MRC 0116+111, revealing a luminous, mini radio-halo of ~240 kpc diameter located at the centre of a cluster of galaxies at redshift z = 0.131. O…
GMRT radio observations of the transiting extrasolar planet HD189733b at 244 and 614 MHz
A. Lecavelier des Etangs, S. K. Sirothia, Gopal-Krishna +1
We report a sensitive search for meter-wavelength emission at 244 and 614 MHz from HD189733b, the nearest known extrasolar transiting planet of `hot-Jupiter' type. To discriminate…
The changing ISM of massive elliptical galaxies and cosmic evolution of radio galaxies and quasars
A. Mangalam, Gopal-Krishna, Paul J. Wiita
The recently discovered apparent dramatic expansion in the effective radii of massive elliptical galaxies from to has been interpreted in terms of eithe…