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36 papers · 2 filters
On the source of QPO of the black hole candidate GRS1915+105: some new observations and their interpretation
Anuj Nandi, Sivakumar G. Manickam, A. R. Rao +1
A few classes of the light curve of the black hole candidate GRS 1915+105 have been analyzed in detail. We discover that unlike the previous findings, QPOs occasionally occur even…
Understanding Galactic Black Hole Candidate GRS 1915+105
Sandip K. Chakrabarti, S. G. Manickam, A. Nandi +1
We interpret observed features of the black hole candidate GRS1915+105 in the light of the advective flow paradigm. The light curve of this black hole is seen to be of four classes…
Spectral Signature of Wind Generation From The Post-Shock Region in GRS1915+105 Accretion Disk
Sandip K. Chakrabarti, Sivakumar G. Manickam, Anuj K. Nandi +1
Accretion and outflows are common in systems which include black holes. Especially important is the case of the well known micro-quasar GRS1915+105 in our own galaxy, where super-l…
Inner Disk Oscillations and QPOs in Relativistic Jet Sources
A. R. Rao
Recent results on the inner disk oscillations found in GRS 1915+105 are reviewed. QPOs during the low state are used as a marker for such oscillations and the physical picture emer…
Implications of 21cm observations for damped Ly- systems
Jayaram N Chengalur, Nissim Kanekar
We present Giant Metrewave Radio Telescope HI 21cm absorption observations, of candidate and confirmed damped Lyman- systems (DLAS). The derived spin temperatures (T_s) are in a…
Reviving Fossil Radio Plasma in Clusters of Galaxies by Adiabatic Compression in Environmental Shock Waves
Torsten A. Ensslin, Gopal-Krishna
We give for a plasma with a history of several expansion and contraction phases an analytical model of the evolution of a contained relativistic electron population under synchrotr…
On the Origin of the Fanaroff-Riley Dichotomy
Gopal-Krishna, Paul J. Wiita
A small fraction of double radio sources show a peculiar and striking hybrid morphology; they have a distinctly FR I structure on one side of the nucleus, and a FR II structure on…
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…
Disk-Jet Connection in the Microquasar GRS 1915+105 and IR and Radio Emission
J. S. Yadav
We present evidence of a direct accretion disk-jet connection in the Galactic microquasar GRS 1915+105 based on our analysis of RXTE/PCA data with a ``spike'' in X-ray light curves…
Far infrared observations of the southern Galactic star forming complex around IRAS 09002-4732
S. K. Ghosh, B. Mookerjea, T. N. Rengarajan +2
The Galactic star forming region in the southern sky, associated with IRAS 09002-4732 has been mapped simultaneously in two far infrared bands (148 & 209 um), with ~ 1' angular res…
A new scheme of radiation transfer in H II regions including transient heating of grains
S. K. Ghosh, R. P. Verma
A new scheme of radiation transfer for understanding infrared spectra of H II regions, has been developed. This scheme considers non-equilibrium processes (e. g. transient heating…
Compact steep-spectrum sources from the S4 sample
D. J. Saikia, S. Jeyakumar, C. J. Salter +3
We present the results of 5-GHz observations with the VLA A-array of a sample of candidate Compact Steep Spectrum sources (CSSs) selected from the S4 survey. We also estimate the s…
Disk-jet connection in GRS 1915+105: X-ray soft dips as cause of radio flares
S. Naik, A. R. Rao
We have examined the radio emission characteristics of the micro-quasar GRS 1915+105 during its X-ray emission states as classified by Belloni et al. (2000). We find that the radio…
Detection of a Series of X-ray Dips Associated with a Radio Flare in GRS 1915+105
S. Naik, P. C. Agrawal, A. R. Rao +3
We report the detection of a series of X-ray dips in the Galactic black hole candidate GRS 1915+105 during 1999 June 6-17 from observations carried out with the Pointed Proportiona…
Radio Jet-blown Neutral Hydrogen Supershells in Spiral Galaxies?
Gopal-Krishna, Judith A. Irwin
Taking a clue from the pair of HI supershells found in the Scd galaxy NGC 3556 (M 108), we propose a new mechanism for the origin of HI supershells in gas-rich massive galaxies. In…
X-ray spectral components in the hard state of GRS 1915+105: origin of the 0.5 - 10 Hz QPO
A. R. Rao, S. Naik, S. V. Vadawale +1
We investigate the origin of the ubiquitous 0.5 - 10 Hz QPO in the Galactic microquasar GRS 1915+105. Using the archival X-ray data from RXTE, we make a wide band X-ray spectral fi…
Distribution of Cold dust in Orion A and B
B. Mookerjea, S. K. Ghosh, T. N. Rengarajan +2
Large scale far-infrared (FIR) observations of the Orion complex at 205 and 138 micron are presented with an aim of studying the distribution of cold (< 25 K) dust. The maps in the…
Rapid State Transitions in the Galactic Black Hole Candidate Source GRS 1915+105
A. R. Rao, J. S. Yadav, B. Paul
We examine the X-ray spectral and temporal behavior of the Galactic black hole candidate source GRS 1915+105 during its spectral state transition observed in 1997 March - August. T…
Dissipative Collapse of a Spherical Cluster of Gas Clouds
K. Indulekha, G. V. Vijayagovindan, S. Ramadurai
With a view to understand the galaxy/star formation scenario, we investigate the dissipative collapse of a spherical cluster of gas clouds with an isotropic velocity distribution.…
Time-scales of Radio Emission in PSR J0437-4715 at 327 MHz
M. Vivekanand
Time-scales of radio emission are studied in PSR J0437-4715 at 327 MHz using almost half a million periods of high quality data from Ooty Radio Telescope. The radio emission in thi…
Possible Discrimination between Gamma Rays and Hadrons using Cerenkov Photon Timing Measurements
V. R. Chitnis, P. N. Bhat
Atmospheric Čerenkov Technique is an established methodology to study energy gamma rays. However the challenging problem has always been the poor signal to noise ratio due to…
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…
A New Narrow-Line Seyfert 1 galaxy : RXJ1236.9+2656
G. C. Dewangan, K. P. Singh, Paula Szkody +1
We report identification of a narrow-line Seyfert 1 galaxy RXJ1236.9+2656. X-ray emission from the NLS1 galaxy undergoes long-term variability with 0.1--2.0 keV flux changing by a…
The Sun's acoustic asphericity and magnetic fields in the solar convection zone
H. M. Antia, S. M. Chitre, M. J. Thompson
The observed splittings of solar oscillation frequencies can be employed to separate the effects of internal solar rotation and to estimate the contribution from a large-scale magn…