40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.3k papers
- Panjab UniversityIN2.1k papers
- Korea UniversityKR1.9k papers
- Sungkyunkwan UniversityKR1.9k papers
- Charles UniversityCZ1.9k papers
- Princeton UniversityUS1.9k papers
- Institute of High Energy PhysicsCN1.8k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.8k papers
- National Central UniversityTW1.8k papers
- Kyungpook National UniversityKR1.8k papers
- University of Maryland, College ParkUS1.8k papers
- University of California, RiversideUS1.8k papers
33 papers · 2 filters
GMRT observations of the field of INTEGRAL X-ray sources- II (newly discovered hard X-ray sources)
M. Pandey, A. P. Rao, R. Manchanda +2
We have conducted low-frequency radio observations with the Giant Metrewave Radio Telescope (GMRT) of 40 new hard X-ray sources discovered by the INTEGRAL satellite. This survey wa…
Study of Fe K-alpha lines in Non-magnetic Cataclysmic Variables using Chandra HEG data
V. R. Rana, K. P. Singh, E. M. Schlegel +1
Results from a study of Fe K-alpha emission lines for a sample of six non-magnetic Cataclysmic Variables (CVs) using the high resolution X-ray data from the Chandra High Energy Tra…
Orbital phase spectroscopy of X-ray pulsars to study the stellar wind of the companion
U. Mukherjee, B. Paul
High Mass X-ray Binary Pulsars (HMXBP), in which the companion star is a source of supersonic stellar wind, provide a laboratory to probe the velocity and density profile of such w…
GMRT Observations of Microquasar V4641 Sgr
C. H. Ishwara-Chandra, A. Pramesh Rao
We report the GMRT observations of V4641 Sgr during the May 2002 outburst at radio frequencies of 610 and 244 MHz. This is the lowest frequency radio detection of this source. The…
Unravelling the nature of HD 81032 - a new RS CVn Binary
J. C. Pandey, K. P. Singh, S. A. Drake +1
BVR photometric and quasi-simultaneous optical spectroscopic observations of the star HD 81032 have been carried out during the years 2000 - 2004. A photometric period of $18.802 \…
Evidence for a high energy curvature in the XMM-Newton spectrum of the ULX NGC1313 X-1
G. C. Dewangan, R. E. Griffiths, A. R. Rao
ASCA X-ray spectra of many ULXs were described in terms of optically thick emission from hot (kT ~1-2keV) accretion disks, while recent XMM-Newton and Chandra observations have rev…
Post-outburst radio observation of the region around McNeil's nebula (V1647 Ori)
S. Vig, S. K. Ghosh, V. K. Kulkarni +1
We present post-outburst (~ 100 days after outburst) radio continuum observation of the region (~ 30' x 30') around McNeil's nebula (V1647 Orionis). The observations were carried o…
Discovery of the short gamma-ray burst GRB 050709
J. S. Villasenor, D. Q. Lamb, G. R. Ricker +30
Gamma-Ray Bursts (GRBs) fall into two classes: short-hard and long-soft bursts. The latter are now known to have X-ray and optical afterglows, to occur at cosmological distances in…
Infrared and radio study of star forming regions associated with IRAS 19111+1048 and IRAS 19110+1045
S. Vig, S. K. Ghosh, V. K. Kulkarni +2
A multiwavelength study of the star forming regions associated with IRAS 19111+1048 and IRAS 19110+1045 has been carried out. These have been simultaneously mapped in two far infra…
GMRT observations of the field of INTEGRAL X-ray sources- I
M. Pandey, R. K. Manchanda, A. P. Rao +2
The INTEGRAL observatory has discovered a variety of hard X-ray sources in the Galactic plane since its launch. Using GMRT, we have made repeated observations of these sources to s…
Low frequency radio monitoring of Cygnus X-1 and Cygnus X-3
M. Pandey, A. P. Rao, G. G. Pooley +3
We present results of monitoring observations of the micro-quasars CygnusX-1 and Cygnus X-3 at 0.61 and 1.28 GHz. The observations were performed with Giant Meter-wave Radio Telesc…
Accretion mode changes in Centaurus X-3
B. Paul, H. Raichur, U. Mukherjee
We report here discovery of the existence of two different accretion modes in the high mass X-ray binary pulsar Cen X-3 during its high states. The multiband X-ray light curves of…
Combining visibilities from the Giant Meterwave Radio Telescope and the Nancay Radio Heliograph: High dynamic range snapshot images of the solar corona at 327 MHz
Claude Mercier, Prasad Subramanian, Alain Kerdraon +3
We report first results from an ongoing program of combining visibilities from the Giant Meterwave Radio Telescope (GMRT) and the Nancay Radio Heliograph (NRH) to produce composite…
XMM-Newton view of the ultra-luminous X-ray sources in M51
Gulab C. Dewangan, Richard E. Griffiths, Manojendu Choudhury +2
(Abridged) We present results based on XMM-Newton observation of the nearby spiral galaxy M51 (NGC5194 and NGC5195). Two ULXs in NGC5194 show evidence for short-term variability, a…
Cosmic ray electron acceleration in the remnant of nova GK Persei?
N. G. Kantharia, G. C. Anupama, Prasad Subramanian
Radio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral ind…
North-South Distribution of Solar Flares during Cycle 23
Bhuwan Joshi, P. Pant, P. K. Manoharan
In this paper, we investigate the spatial distribution of solar flares in the northern and southern hemisphere of the Sun that occurred during the period 1996 to 2003. This period…
HD 12098 and other results from NainiTal-Cape survey
V. Girish
NainiTal-Cape Survey is a survey started with the aim of searching for new rapidly oscillating Ap stars in the northern hemisphere and has discovered one mono-periodic roAp star HD…
Near room temperature X-ray and Gamma ray spectroscopic detectors for future space experiments
J. S. Yadav, S. Savitri, J. P. Malkar
New generation Cadmium Telluride (CZT & CdTe) solid state detectors can provide high quantum efficiency with reasonably good energy resolution and can operate at near room temperat…
Interstellar extinction towards open clusters and galactic structure
Yogesh C. Joshi
We study the distribution of interstellar matter near the galactic plane on the basis of open star clusters and reviewed the correlation of extinction with different physical param…
Anti-correlated hard X-ray time lag in GRS 1915+105: evidence for a truncated accretion disc
Manojendu Choudhury, A. R. Rao, Surajit Dasgupta +3
Multi-wavelength observations of Galactic black hole candidate sources indicate a close connection between the accretion disk emission and the jet emission. The recent discovery of…
Optical and X-ray studies of chromospherically active stars : FR Cancri, HD 95559 and LO Pegasi
J. C. Pandey, K. P. Singh, S. A. Drake +1
We present a multiwavelength study of three chromospherically active stars, namely FR Cnc (= BD +16\degr 1753), HD 95559 and LO Peg (=BD +22\degr 4409), including newly obtained op…
X-Ray Emission and Optical Polarization of V1432 Aquilae: An Asynchronous Polar
V. R. Rana, K. P. Singh, P. E. Barrett +1
A detailed analysis of X-ray data from ROSAT, ASCA, XMM and RXTE for the asynchronous polar V1432 Aql along with Stokes polarimetry data from SAAO, is presented. Power spectra from…
GRS 1915+105: the distance, radiative processes and energy-dependent variability
Andrzej A. Zdziarski, Marek Gierlinski, A. R. Rao +2
We present an exhaustive analysis of five broad-band observations of GRS 1915+105 in two variability states, chi and omega, observed simultaneously by the PCA, HEXTE and OSSE. We f…
High resolution X-ray spectrum of the accreting binary X-ray pulsar GX 1+4
B. Paul, T. Dotani, F. Nagase +2
We present here high resolution X-ray spectrum of the accreting binary X-ray pulsar GX 1+4 obtained with the High Energy Transmission Grating (HETG) instrument of the Chandra X-ray…