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19 papers · 2 filters
A fit to the simultaneous broadband spectrum of Cygnus X-1 using the transition disk model
R. Misra, V. R. Chitnis, F. Melia
We have used the transition disk model to fit the simultaneous broad band ( keV) spectrum of Cygnus X-1 from OSSE and Ginga observations. In this model, the spectrum is prod…
ORT observations of the damped Lyman alpha system towards PKS 0201+113
Nissim Kanekar, Jayaram N Chengalur
We report a deep radio search with the Ooty Radio Telescope (ORT) for the redshifted 21 cm absorption line from the damped Lyman alpha system seen at redshift 3.388 against the qua…
Broad band X-ray spectrum of Cygnus X-1
V. R. Chitnis, A. R. Rao, P. C. Agrawal
We present the hard X-ray (20-100 keV) observations of Cygnus X-1 obtained using a large area balloon-borne Xenon filled Multi-anode Proportional Counter (XMPC) telescope. The obse…
Quasi-regular X-ray bursts from GRS 1915+105 observed with the IXAE: possible evidence for matter disappearing into the event horizon of the black hole
B. Paul, P. C. Agrawal, A. R. Rao
Three different types of very intense, quasi-regular X-ray bursts have been observed from the Galactic superluminal X-ray transient source GRS 1915+105 with the Pointed Proportiona…
X-ray variability of GRS 1915+105 during the low-hard state observed with the Indian X-ray astronomy experiment (IXAE)
B. Paul, P. C. Agrawal, A. R. Rao
The galactic superluminal transient X-ray source GRS 1915+105 was observed with the pointed proportional counters (PPCs) onboard the Indian satellite IRS-P3 during 1996 July 23-27.…
Seismic inversions for temperature and chemical composition profiles in the solar interior
H. M. Antia, S. M. Chitre
The primary inversion of the accurately measured frequencies of solar oscillations determines the mechanical properties of the Sun, i.e., the sound speed and density as a function…
X-ray spectrum of the high polarization quasar PKS 1510-089
K. P. Singh, C. R. Shrader, I. M. George
We present results on the X-ray spectra of the radio-loud, high-polarization quasar, PKS 1510-089, based on new data obtained using ASCA, and from archival ROSAT data. The X-ray sp…
Estimate of solar radius from f-mode frequencies
H. M. Antia
Frequency and rotational splittings of the solar f-modes are estimated from the GONG data. Contrary to earlier observations the frequencies of f-modes are found to be close to the…
Neutrino Spectroscopy of the Early Phase of Nearby Supernovae
F. K. Sutaria, A. Ray
Neutrinos emitted during stellar core collapse up to their trapping phase carry information about the stage from which the Supernova explosion process initiates. The dominant …
Spatial distribution of Far infrared emission in spiral galaxies II. Heating sources and gas-to-dust ratio
Y. D. Mayya, T. N. Rengarajan
We study the radial distribution of the temperature of the warm dust and gas-to-dust mass ratios in a sample of 22 spiral galaxies. The heating capabilities of the diffuse interste…
Spatial distribution of far infrared emission in spiral galaxies I. Relation with radio continuum emission
Y. D. Mayya, T. N. Rengarajan
We use high resolution IRAS and 20 cm radio continuum (RC) images of a sample of 22 spiral galaxies to study the correlation between the far infra-red (FIR) and RC emissions within…
Pachmarhi Array of Cerenkov Telescopes
P. N. Bhat
This talk is based on the Very High Energy Gamma Ray Astronomy observations planned to be carried out at Pachmarhi in the central Indian state of Madhya Pradesh using the well know…
Pachmarhi Array of Cerenkov Telescopes
P. N. Bhat, P. R. Vishwanath, B. S. Acharya +1
Very High Energy (VHE) gamma -ray Astronomy observations are planned to be carried out at Pachmarhi in the central Indian state of Madhya Pradesh using the well known atmospheric C…
The role of fluctuations in atmospheric Cerenkov technique
P. N. Bhat
In the absence of a standard source of gamma rays or hadrons of known energy one has to study the details of production of \v Cerenkov light at the observation level only through d…
Spectral Properties of Accretion Disks Around Black Holes II -- Sub-Keplerian Flows With and Without Shocks
Sandip K. Chakrabarti
Close to a black hole, the density of the sub-Keplerian accreting matter becomes higher compared to a spherical flow due to the presence of a centrifugal barrier independent of whe…
Interpretation of the Center-Filled Emission from the Supernova Remnant W44
Ilana M. Harrus, John P. Hughes, K. P. Singh +2
(Abridged) We have investigated two evolutionary scenarios advanced to explain the centrally-brightened X-ray morphology of the supernova remnant (SNR) W44: (1) a model involving t…
Seismic investigation of the solar structure using GONG frequencies
S. C. Tripathy, H. M. Antia, F. Hill +1
Using the recently obtained GONG frequencies, we investigate the properties of the solar interior by constructing solar models with various input physics like opacities, equation o…
A double peaked pulse profile observed in GX 1+4
B. Paul, P. C. Agrawal, A. R. Rao +1
The hard X-ray pulsar GX 1+4 was observed several times in the last few years with a pair of balloon-borne Xenon filled Multi-cell Proportional Counters (XMPC). In a balloon flight…
Torque-luminosity correlation and possible evidence for core-crust relaxation in the X-ray pulsar GX 1+4
B. Paul, A. R. Rao, K. P. Singh
We present the detection of a positive correlation between spin-down rate and pulsed X-ray luminosity in the BATSE archival data of the bright hard X-ray pulsar GX 1+4. W…