To unravel the dominant cause of the weak emission line in a subset of optically selected
radio-quiet 'weak emission line quasars'(WLQs), we have investigated the possibility of an …

We report the first attempt to systematically characterize intra-night optical variability (INOV)
of the rare and enigmatic subset of narrow-line Seyfert1 galaxies (NLSy1s), which is marked …

Weak-line quasars (WLQs) are a notable group of active galactic nuclei (AGNs) that show
unusually weak UV lines even though their optical-UV continuum shapes are similar to …

We report the first results obtained from our campaign to characterize the intra-night-optical
variability (INOV) properties of Fermi detected blazars, using the observations from the …

Abstract Active Galactic Nucleus (AGN) variability can be used to study the physics of the
region in the vicinity of the central black hole. In this paper, we investigated intra-night …

Abstract SDSS J163401. 94+ 480940.1 is a non-jetted radio-loud narrow-line Seyfert 1
(NLSy1) galaxy. Optical monitoring of this object was carried out in two intra-night sessions …

For a new sample of eight weak-line quasars (WLQs) we report a sensitive search in 20
intranight monitoring sessions, for blazar-like optical flux variations on hour-like and longer …

We present optical photometric and spectroscopic data for supernova SN 2004ab, a highly
reddened normal Type Ia supernova. The total reddening is estimated as E (B− V) …

ABSTRACT A small subset of optically selected radio-quiet quasars showing weak or no
emission lines may turn out to be the elusive radio-quiet BL Lac objects, or simply be radio …

The majority of the γ-ray sources detected by the Fermi Gamma-ray Space Telescope
belong to the blazar class of active galactic nuclei (AGNs). In addition to blazars, a minority …