220 citations · 3.7k across the 157 of their papers we have counts for
17 papers · 1 filter
Obscured and powerful AGN and starburst activities at z~3.5
M. Polletta, A. Omont, S. Berta +9
We report the discovery of two sources at z=3.867 and z=3.427 that exhibit powerful starburst and AGN activities. They benefit from data from radio to X rays from the CFHTLS-D1/SWI…
Night sky at the Indian Astronomical Observatory during 2000-2008
C. S. Stalin, M. Hegde, D. K. Sahu +4
We present an analysis of the optical night sky brightness and extinction coefficient measurements in UBVRI at the Indian Astronomical Observatory (IAO), Hanle, during the period 2…
Detection of IMBHs from microlensing in globular clusters
Margarita Safonova, C. S. Stalin
Globular clusters have been alternatively predicted to host intermediate-mass black holes (IMBHs) or nearly impossible to form and retain them in their centres. Over the last decad…
Multiband optical monitoring of the blazars S5 0716+714 and BL Lacertae
C. S. Stalin, Gopal-Krishna, Ram Sagar +3
We report results of multiband optical monitoring of two well known blazars, S5 0716+714 and BL Lacertae, carried out in 1996 and 2000-01 with an aim to study optical variations on…
POINT-AGAPE Pixel Lensing Survey of M31 : Evidence for a MACHO contribution to Galactic Halos
S. Calchi Novati, S. Paulin-Henriksson, J. An +15
The POINT-AGAPE collaboration is carrying out a search for gravitational microlensing toward M31 to reveal galactic dark matter in the form of MACHOs (Massive Astrophysical Compact…
Long-term optical photometric monitoring of the quasar SDSS J153259.96-003944.1
C. S. Stalin, R. Srianand
We report optical Cousins R and I band monitoring observations of the high redshift (z = 4.67) QSO SDSS J153259.96-003944.1 that does not show detectable emission lines in its opti…
The POINT-AGAPE survey II: An Unrestricted Search for Microlensing Events towards M31
V. Belokurov, J. An, N. W. Evans +16
An automated search is carried out for microlensing events using a catalogue of 44554 variable superpixel lightcurves derived from our three-year monitoring program of M31. Each st…
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…
Classical novae from the POINT-AGAPE microlensing survey of M31 -- I. The nova catalogue
M. J. Darnley, M. F. Bode, E. Kerins +16
The POINT-AGAPE survey is an optical search for gravitational microlensing events towards the Andromeda Galaxy (M31). As well as microlensing, the survey is sensitive to many diffe…
The POINT-AGAPE Survey I: The Variable Stars in M31
Jin H. An, N. W. Evans, P. Hewett +14
The POINT-AGAPE collaboration has been monitoring M31 for three seasons with the Wide Field Camera on the Isaac Newton Telescope. In each season, data are taken for one hour per ni…
Optical variability properties of high luminosity AGN classes
C. S. Stalin, Gopal-Krishna, Ram Sagar +1
We present the results of a comparative study of the intra-night optical variability (INOV) characteristics of radio-loud and radio-quiet quasars, which involves a systematic intra…
Intranight optical variability of radio-quiet and radio lobe dominated quasars
C. S. Stalin, Gopal-Krishna, Ram Sagar +1
We present results of a programme of multi-epoch, intra-night optical monitoring of a sample of non-blazar type AGN, which includes seven radio-quiet QSOs (RQQs) and an equal numbe…
Intranight optical variability of Blazars
Ram Sagar, C. S. Stalin, Gopal-Krishna +1
We present results of a multi-epoch intra-night optical monitoring of eleven blazars consisting of six BL Lac objects and five radio core-dominated quasars (CDQs). These densely sa…
Clear Evidence for Intranight Optical Variability in Radio-quiet Quasars
Gopal-Krishna, C. S. Stalin, Ram Sagar +1
We present new clues to the problem of the radio loudness dichotomy arising from an extensive search for intranight optical variability in seven sets of optically luminous radio-qu…
Evidence for Shock Acceleration and Intergalactic Magnetic Fields in a Large-Scale Filament of Galaxies ZwCl 2341.1+0000
Joydeep Bagchi, Torsten A. Ensslin, Francesco Miniati +4
We report the discovery of large-scale diffuse radio emission from what appears to be a large-scale filamentary network of galaxies in the region of cluster ZwCl 2341.1+0000, and s…
Optical and Radio observations of the bright GRB010222 afterglow: evidence for rapid synchrotron cooling?
R. Sagar, C. S. Stalin, D. Bhattacharya +8
We report photometric observations of the optical afterglow of GRB010222 in V,R and I passbands carried out at UPSO, Naini Tal between 22-27 Feb 2001. We determine CCD Johnson BV a…
GRB000301C with peculiar afterglow emission
R. Sagar, V. Mohan, S. B. Pandey +3
The CCD magnitudes in Johnson V and Cousins R and I photometric passbands are determined for GRB 000301C afterglow starting ~ 1.5 day after the gamma-ray burst. In fact we provide…