5k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Aryabhatta Research Institute of Observational SciencesIN239 papers
- Tata Institute of Fundamental ResearchIN175 papers
- Centre National de la Recherche ScientifiqueFR133 papers
- Pondicherry UniversityIN120 papers
- Indian Institute of Science BangaloreIN119 papers
- Inter-University Centre for Astronomy and AstrophysicsIN114 papers
- Christ UniversityIN108 papers
- National Centre for Radio AstrophysicsIN98 papers
- Physical Research LaboratoryIN92 papers
- Chinese Academy of SciencesCN77 papers
- Instituto de Astrofísica de CanariasES77 papers
- National Astronomical Observatory of JapanJP77 papers
22 papers · 1 filter
The parsec-scale central components of FR I radio galaxies
Preeti Kharb, Prajval Shastri
A majority of a complete sample of 3CR FR I radio galaxies show unresolved optical nuclear sources on the scales of 0.1 arcsec. About half of the 3CR FR II radio galaxies observed…
General relativistic spectra of accretion disks around rotating neutron stars
S. Bhattacharyya, R. Misra, A. V. Thampan
General relativistic spectra from accretion disks around rotating neutron stars in the appropriate space-time geometry for several different equation of state, spin rates and mass…
Are Radio Pulsars Strange Stars ?
R. C. Kapoor, C. S. Shukre
A remarkably precise observational relation for pulse core component widths of radio pulsars is used to derive stringent limits on pulsar radii, strongly indicating that pulsars ar…
Early observations of the Afterglow of GRB000301c
S. G. Bhargavi, R. Cowsik
We report multiband observations of the Optical Transient (OT) associated with GRB000301c carried out between 2--4 March 2000 using the 2.34-m Vainu Bappu Telescope (VBT) at Kavalu…
The Central Velocity Field in NGC 253 : Possible Indication of a Bar
Mousumi Das, K. R. Anantharamaiah, M. S. Yun
We have investigated whether motion of gas in a bar-like potential can account for the peculiar but systematic velocity field observed in the nuclear region of the starburst galaxy…
Rapidly rotating strange stars for a new equation of state of strange quark matter
I. Bombaci, A. V. Thampan, B. Datta
For a new equation of state of strange quark matter, we construct equilibrium sequences of rapidly rotating strange stars in general relativity. The sequences are the normal and su…
The Chemical Compositions of the SRd Variable Stars. III. KK Aquilae, AG Aurigae, Z Aurigae, W Leo Minoris, and WW Tauri
S. Giridhar, D. L. Lambert, G. Gonzalez
Chemical compositions are derived from high-resolution spectra for five field SRd variables. These supergiants not previously analysed are shown to be metal-poor: KK Aql with [Fe/H…
Comment on "On physical interpretation of the Poynting-Robertson effect"
R. Srikanth
In response to the comments of astro-ph/0006426 on Srikanth (Icarus 1999), we clarify, and thereby justify, the definition of Poynting-Robertson drag adopted in the latter. We conf…
Joule Heating in Neutron Stars under Strong Gravitation
Sujan Sengupta
Considering Joule heating caused by the dissipation of the magnetic field in the neutron star crust to be an efficient mechanism in maintaining a relatively high surface temperatur…
Line Formation in the Atmosphere of Brown Dwarf Gliese 229B: at 2.3 micron
Sujan Sengupta, Vinod Krishan
We investigate the formation of methane line at 2.3 in Brown Dwarf Gliese 229B. Two sets of model parameters with (a) K and , (b) $T_{\r…
Black Holes in Non-flat Backgrounds: the Schwarzschild Black Hole in the Einstein Universe
K. Rajesh Nayak, M. A. H. MacCallum, C. V. Vishveshwara
As an example of a black hole in a non-flat background a composite static spacetime is constructed. It comprises a vacuum Schwarzschild spacetime for the interior of the black hole…
Active Nucleus in a Poststarburst Galaxy : KUG 1259+280
G. C. Dewangan, K. P. Singh, Y. D. Mayya +1
We report the discovery of an active nucleus in a poststarburst galaxy, KUG1259+280. High resolution X-ray imaging observations with ROSAT HRI show that X-ray emission from KUG1259…
Quantum correlations from local amplitudes and the resolution of the Einstein-Podolsky-Rosen nonlocality puzzle
C. S. Unnikrishnan
The Einstein-Podolsky-Rosen nonlocality puzzle has been recognized as one of the most important unresolved issues in the foundational aspects of quantum mechanics. We show that the…
On cooling flows and the Sunyaev-Zel'dovich effect
Subhabrata Majumdar, Biman Nath
We study the effect of cooling flows in galaxy clusters on the Sunyaev-Zel'dovich (SZ) distortion and the possible cosmological implications. The SZ effect, alongwith X-ray observa…
Abundance evolution of intermediate mass elements (C to Zn) in the Milky Way halo and disk
Aruna Goswami, Nikos Prantzos
We present a comprehensive study of the evolution of the abundances of intermediate mass elements, from C to Zn, in the Milky Way halo and in the local disk. We use a consistent mo…
Excitation of Oscillations in the Magnetic Network on the Sun
S. S. Hasan, W. Kalkofen, A. A. van Ballegooijen
We examine the excitation of oscillations in the magnetic network of the Sun through the footpoint motion of photospheric magnetic flux tubes located in intergranular lanes. The mo…
Temperature Profiles of Accretion Disks around Rapidly Rotating Neutron Stars in General Relativity and Implications for Cygnus X-2
S. Bhattacharyya, A. V. Thampan, R. Misra +1
We calculate the temperature profiles of (thin) accretion disks around rapidly rotating neutron stars (with low surface magnetic fields), taking into account the full effects of ge…
Perspective of long baseline interferometry
S K Saha, S. Morel
This article is a sort of sequel of the earlier extensive review by Saha (1999a) where emphasis was laid down on the ground based single aperture, as well as on the working long ba…
Speckle Imaging: a boon for astronomical observations
S K Saha
The speckle imaging is a photographic technique that resolves objects viewed through severely distorted media. The results are insensitive to the errors caused by apparent size of…
Effect of Beam-Plasma Instabilities on Accretion Disk Flares
Vinod Krishan, Paul J. Wiita, S. Ramadurai
We show that a certain class of flare models for variability from accretion disk coronae are subject to beam-plasma instabilities. These instabilities can prevent significant direc…
High-resolution spectroscopy of V854 Cen in decline - Absorption and emission lines of C_2 molecules
N. Kameswara Rao, David L. Lambert
High-resolution optical spectra of the R Coronae Borealis (RBC) star V854 Centauri in the early stages of a decline show, in addition to the features reported for other RCBs in dec…
Conversion of neutron stars to strange stars as the central engine of gamma-ray bursts
Ignazio Bombaci, Bhaskar Datta
We study the conversion of a neutron star to a strange star as a possible energy source for gamma-ray bursts. We use different recent models for the equation of state of neutron st…