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31 papers · 2 filters
Periodicities In The X-Ray Intensity Variations of TV Columbae: An Intermediate Polar
V. R. Rana, K. P. Singh, E. M. Schlegel +1
We present results from a temporal analysis of the longest and the most sensitive X-ray observations of TV Columbae--an intermediate polar. The observations were carried out with t…
X-ray and radio prompt emission from a hypernova SN 2002ap
P. Chandra, A. Ray, F. Sutaria
Here we report on combined X-ray and radio observations of SN 2002ap with XMM-Newton ToO observation and GMRT observations aided with VLA published results. In deriving the X-ray f…
Low frequency radio and X-ray properties of core-collapse supernovae
A. Ray, P. Chandra, F. Sutaria +1
Radio and X-ray studies of young supernovae probe the interaction between the supernova shock waves and the surrounding medium and give clues to the nature and past of the progenit…
Low frequency observations of SN 1993J with Giant Meterwave Radio Telescope
P. Chandra, A. Ray, S. Bhatnagar
In this paper, we discuss the low frequency spectrum of SN 1993J with GMRT. We observed SN 1993J at several epochs in 20cm, 50cm, 90cm and 125cm wavelengths and achieved near simul…
Photometric study of two novae in M31
Y. C. Joshi, A. K. Pandey, D. Narasimha +3
We report light curves of 2 novae in the M31 galaxy which were detected in the four year Nainital Microlensing Survey. One of these novae has been tracked from the initial…
A study of the Galactic star forming region IRAS 02593+6016 / S 201 in infrared and radio wavelengths
D. K. Ojha, S. K. Ghosh, V. K. Kulkarni +3
We present infrared and radio continuum observations of S 201 star forming region. A massive star cluster is observed in this region, which contains different classes of young stel…
Detection of OH and wide HI absorption toward B0218+357
N. Kanekar, J. N. Chengalur, A. G. de Bruyn +1
We present deep GMRT OH and WSRT HI absorption spectra of the gravitational lens toward B0218+357. Both the 1665 MHz and 1667 MHz OH lines are clearly detected for the…
Highlights of the HETE-2 Mission
D. Q. Lamb, G. R. Ricker, J. -L. Atteia +37
The HETE-2 mission has been highly productive. It has observed more than 250 GRBs so far. It is currently localizing 25 - 30 GRBs per year, and has localized 43 GRBs to date. Twent…
Coronae of Cool Stars
M. Audard, S. A. Drake, M. Güdel +6
We present preliminary results of grating observations of YY Mensae and V824 Arae by Chandra and XMM-Newton. Spectral features are presented in the context of the emission measure…
Giant Meterwave Radio Telescope observations of an M2.8 flare: insights into the initiation of a flare-coronal mass ejection event
Prasad Subramanian, S. Ananthakrishnan, P. Janardhan +3
We present the first observations of a solar flare with the GMRT. An M2.8 flare observed at 1060 MHz with the GMRT on Nov 17 2001 was associated with a prominence eruption observed…
Timing and spectral studies of LMC X-4 in high and low states with Beppo-SAX: Detection of pulsations in the soft spectral component
S. Naik, B. Paul
We report here detailed timing and spectral analysis of two Beppo-SAX observations of the binary X-ray pulsar LMC X-4 carried out during the low and high states of its 30.5 days lo…
GMRT Observations of NGC 3079
Judith A. Irwin, D. J. Saikia
We present new observations at three frequencies (326 MHz, 615 MHz, and 1281 MHz) of the radio lobe spiral galaxy, NGC 3079, using the Giant Metrewave Radio Telescope. These observ…
Interpretation of the Global Anisotropy in the Radio Polarizations of Cosmologically Distant Sources
Pankaj Jain, S. Sarala
We present a detailed statistical study of the observed anisotropy in radio polarizations from distant extragalactic objects. This anisotropy was earlier found by Birch (1982) and…
Strange Stars with a Density-Dependent Bag Parameter
Nirvikar Prasad, R. S. Bhalerao
We have studied strange quark stars in the framework of the MIT bag model, allowing the bag parameter B to depend on the density of the medium. We have also studied the effect of C…
Scientific Highlights of the HETE-2 Mission
D. Q. Lamb, G. R. Ricker, J-L. Atteia +37
The HETE-2 mission has been highly productive. It has observed more than 250 GRBs so far. It is currently localizing 25 - 30 GRBs per year, and has localized 43 GRBs to date. Twent…
A Ring Shaped Embedded Young Stellar (Proto)Cluster
M. S. Nanda Kumar, D. K. Ojha, C. J. Davis
We present sub-arcsec (FWHM ~ 0.5") J, H, K and L' images of a young stellar cluster associated with a candidate massive protostar IRAS22134+5834. The observations reveal a central…
On the origin of the various types of radio emission in GRS 1915+105
S. V. Vadawale, A. R. Rao, S. Naik +4
We investigate the association between the radio ``plateau'' states and the large superluminal flares in GRS 1915+105 and propose a qualitative scenario to explain this association…
3C459: A highly asymmetric radio galaxy with a starburst
P. Thomasson, D. J. Saikia, T. W. B. Muxlow
Multifrequency radio observations of the radio galaxy 3C459 using MERLIN, VLA and the EVN, and an optical HST image using the F702W filter are presented. The galaxy has a very asym…
ISOGAL: A deep survey of the obscured inner Milky Way with ISO at 7 and 15 micron and with DENIS in the near-infrared
A. Omont, G. Gilmore, C. Alard +38
The ISOGAL project is an infrared survey of specific regions sampling the Galactic Plane selected to provide information on Galactic structure,stellar populations,stellar mass-loss…
Does the Sun shrink with increasing magnetic activity?
H. M. Antia
It has been demonstrated that frequencies of f-modes can be used to estimate the solar radius to a good accuracy. These frequencies have been used to study temporal variations in t…
Mapping of Large Scale 158 micron [CII] Line Emission: Orion A
B. Mookerjea, S. K. Ghosh, H. Kaneda +5
We present the first results of an observational programme undertaken to map the fine structure line emission of singly ionized carbon ([CII] 157.7409 micron) over extended regions…
Correlated radio:X-ray emission in the hard states of Galactic microquasars
M. Choudhury, A. R. Rao, S. V. Vadawale +1
We present results of our study of correlated radio and X-ray emission in two black hole candidates and Galactic microquasars GRS 1915+105 and Cygnus X-1 in their steady long term…
Near-IR spectra of ISOGAL sources in the Inner Galactic Bulge
M. Schultheis, A. Lançon, A. Omont +2
In this work we present near-IR spectra (HK-band) of a sample of 107 sources with mid-IR excesses at 7 and 15 m detected during the ISOGAL survey. Making use of the DENIS in…
Stellar sources in the ISOGAL intermediate bulge fields
D. K. Ojha, A. Omont, F. Schuller +3
We present a study of ISOGAL sources in the "intermediate" galactic bulge ( 2, 1--4), observed by ISOCAM at 7 and 15 . In…