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29 papers · 2 filters
First microlensing candidate towards M31 from the Nainital Microlensing Survey
Y. C. Joshi, A. K. Pandey, D. Narasimha +1
We report our first microlensing candidate NMS-E1 towards M31 from the data accumulated during the four years of Nainital Microlensing Survey. Cousin R and I band observations of ~…
V1647 Orionis (IRAS 05436-0007) : A New Look at McNeil's Nebula
D. K. Ojha, N. Kusakabe, M. Tamura +10
We present a study of the newly discovered McNeil's nebula in Orion using the JHKs-band simultaneous observations with the near-infrared (NIR) camera SIRIUS on the IRSF 1.4m telesc…
The Wide Field Imager Lyman-Alpha Search (WFILAS) for Galaxies at Redshift ~5.7: I. A Spatially Compact Lyman-alpha Emitting Galaxy at Redshift 5.721
Eduard Westra, D. Heath Jones, Chris E. Lidman +6
We report the spectroscopic confirmation of a compact \lya emitting galaxy at . A FORS2 spectrum of the source shows a strong asymmetric line with a flux of 5$\times10^{-1…
Do the mildly superluminal VLBI knots exclude ultrarelativistic blazar jets?
Gopal-Krishna, Samir Dhurde, Paul J. Wiita
We compute the effective values of apparent transverse velocity and flux boosting factors for the VLBI radio knots of blazar jets, by integrating over the angular distributions of…
Detection of anti-correlated hard X-ray time lag in Cygnus X-3
Manojendu Choudhury, A. R. Rao
The wide-band X-ray spectra of the high mass X-ray binary Cygnus X-3 exhibits a pivoting behavior in the `low' (as well as `hard') state, correlated to the radio emission. The time…
Implications of aging in young supernovae
Poonam Chandra, Alak Ray
We present here the combined radio spectrum from the Giant Metrewave Radio Telescope (GMRT) and Very Large Array (VLA) of type-IIb SN 1993J (age 11 years) and a type-Ic SN 2003bg (…
Baby supernovae through the looking glass at long wavelengths
Poonam Chandra, Alak Ray
We emphasize the importance of observations of young supernovae in wide radio band. We argue on the basis of observational results that only high or only low frequency data is not…
Detection of hard X-ray pulsations and a strong iron K_beta emission line during an extended low state of GX 1+4
S. Naik, B. Paul, P. J. Callanan
We present here results obtained from a detailed timing and spectral analysis of three BeppoSAX observations of the binary X-ray pulsar GX 1+4 carried out in August 1996, March 199…
Radio sources at low Galactic latitudes
D. J. Saikia, P. Thomasson, S. Roy +2
We present high-resolution radio observations of a sample of 65 radio sources at low Galactic latitudes. The sources were all observed at 5 GHz with the Very Large Array A-array. M…
Orbital Phase Spectroscopy of GX 301--2 with RXTE-PCA
U. Mukherjee, B. Paul
We have investigated the orbital phase dependence of the X-ray spectrum of the High Mass X-ray Binary pulsar GX 301--2. Here we present the results from a spectral analysis of two…
Detection of absorption features in the X-ray spectrum of the narrow-line Quasar PG 1404+226 : Possible evidence for accretion disk winds
Surajit Dasgupta, A. R. Rao, G. C. Dewangan +1
We present the results of an analysis of data from XMM-Newton and CHANDRA observations of the high luminosity narrow-line quasar PG 1404+226. We confirm a strong soft X-ray excess…
A near-infrared study of the NGC 7538 star forming region
D. K. Ojha, M. Tamura, Y. Nakajima +11
We present sub-arcsecond (FWHM ~ 0".7), NIR JHKs-band images and a high sensitivity radio continuum image at 1280 MHz, using SIRIUS on UH 88-inch telescope and GMRT. The NIR survey…
High Energy Observations of XRF 030723: Evidence for an Off-axis Gamma-Ray Burst?
N. R. Butler, T. Sakamoto, M. Suzuki +34
We report High Energy Transient Explorer 2 (HETE-2) Wide Field X-ray Monitor/French Gamma Telescope observations of XRF030723 along with observations of the XRF afterglow made usin…
Associated HI absorption in the z=3.4 radio galaxy B2 0902+343 observed with the GMRT
P. Chandra, G. Swarup, V. K. Kulkarni +1
We have made observations of the associated HI absorption of a high redshift radio galaxy 0902+34 at z=3.395 with the Giant Meterwave Radio Telescope in the MHz band. We…
Neutrino signatures of supernova shock and reverse shock propagation
R. Tomas, M. Kachelriess, G. Raffelt +3
A few seconds after bounce in a core-collapse supernova, the shock wave passes the density region corresponding to resonant neutrino oscillations with the ``atmospheric'' neutrino…
Studies of orbital parameters and pulse profile of the accreting millisecond pulsar XTE J1807-294
M. G. F. Kirsch, K. Mukerjee, M. G. Breitfellner +4
The accreting millisecond pulsar XTE J1807-294 was observed by XMM-Newton on March 22, 2003 after its discovery on February 21, 2003 by RXTE. The source was detected in its bright…
Stars as thermonuclear reactors: their fuels and ashes
A. Ray
Atomic nuclei are transformed into each other in the cosmos by nuclear reactions inside stars: -- the process of nucleosynthesis. The basic concepts of determining nuclear reaction…
The late time radio emission from SN 1993J at meter wavelengths
P. Chandra, A. Ray, S. Bhatnagar
We present the investigations of SN 1993J using low frequency observations with the Giant Meterwave Radio Telescope. We analyze the light curves of SN 1993J at 1420, 610, 325 and 2…
XMM observations of the narrow-line QSO PHL 1092: Detection of a high and variable soft component
Surajit Dasgupta, A. R. Rao, G. C. Dewangan
We present results based on an XMM-Newton observation of the high luminosity narrow-line QSO PHL 1092 performed in 2003 January. The 0.3 - 10 keV spectrum is well described by a mo…
Binary corrected X-ray light curve of Cygnus X-3 : implications for the timing properties of the compact binary system
M. Choudhury, A. R. Rao, S. V. Vadawale +2
We study the binary corrected X-ray light curve of Cygnus X-3 using the RXTE-ASM data and RXTE-PCA data. We find that the X-ray template derived from the EXOSAT observations adequa…
Constraining solar abundances using helioseismology
Sarbani Basu, H. M. Antia
Recent analyses of solar photospheric abundances suggest that the oxygen abundance in the solar atmosphere needs to be revised downwards. In this study we investigate the consequen…
Deep near-infrared observations of W3 Main star forming region
D. K. Ojha, M. Tamura, Y. Nakajima +8
We present a deep JHKs-band imaging survey of the W3 Main star forming region, using the near-infrared camera, SIRIUS, mounted on the University of Hawaii 2.2m telescope. The near-…
Wide-Area Mapping of 155 Micron Continuum Emission from the Orion Molecular Cloud Complex
S. Arimura, H. Shibai, T. Teshima +9
We present the results of a wide-area mapping of the far-infrared continuum emission toward the Orion complex by using a Japanese balloon-borne telescope. The 155-um continuum emis…
Ejection of the inner accretion disk in GRS 1915+105: the magnetic rubber-band effect
A. Nandi, S. K. Chakrabarti, S. V. Vadawale +1
We examine theoretically the behaviour of the inner accretion disk in GRS 1915+105 when soft X-ray dips are present in the X-ray light curve. We assume the presence of a radial sho…