273 citations · 2.2k across the 98 of their papers we have counts for
8 papers · 1 filter
Intranight optical variability of low-mass Active Galactic Nuclei: A Pointer to blazar-like activity
Gopal-Krishna, Krishan Chand, Hum Chand +4
This study aims to characterise, for the first time, intranight optical variability (INOV) of low-mass active galactic nuclei (LMAGN) which host a black hole (BH) of mass $M_{BH} \…
X-shaped radio galaxy 3C 223.1: A 'double boomerang' with an anomalous spectral gradient
Gopal-Krishna, Pratik Dabhade
A comparison of the recent LOFAR 144 MHz map of the radio source 3C 223.1 (J094124.028+394441.95) with the VLA maps at 4.9 GHz and 8.3 GHz that we built based on archival data, est…
The radio source in Abell 980: A Detached-Double-Double Radio Galaxy?
Gopal-Krishna, Surajit Paul, Sameer Salunkhe +1
It is argued that the new morphological and spectral information gleaned from the recently published LoFAR Two meter Sky Survey data release 2 (LoTSS-2 at 144 MHz) observations of…
Discovery of inverse-Compton X-ray emission and estimate of the volume-averaged magnetic field in a galaxy group
F. Mernier, N. Werner, J. Bagchi +6
Observed in a significant fraction of clusters and groups of galaxies, diffuse radio synchrotron emission reveals the presence of relativistic electrons and magnetic fields permeat…
Deciphering the ultra-steep spectrum diffuse radio sources discovered in the cool-core cluster Abell~980
Sameer Salunkhe, Surajit Paul, Gopal-Krishna +2
Clusters of galaxies are excellent laboratories for studying recurring nuclear activity in galactic nuclei since their hot gaseous medium can vastly prolong the detectability of th…
Persistence of blazar state in flat-spectrum radio quasars
Krishan Chand, Gopal-Krishna
Flat-spectrum radio quasars (FSRQs) whose brightness is dominated by a relativistically beamed core, are frequently found in 'blazar state' commonly inferred from a high optical po…