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32 papers · 2 filters
Stellar contents and star formation in the young open cluster Stock 8
Jessy Jose, A. K. Pandey, D. K. Ojha +7
We present CCD photometry of the young open cluster Stock 8 with the aim to study the basic properties and star formation scenario in this region. The radius of the cluste…
The Local Group dwarf Leo T: HI on the brink of star formation
Emma V. Ryan-Weber, Ayesha Begum, Tom Oosterloo +5
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork ynthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H…
Helioseismology and Solar Abundances
Sarbani Basu, H. M. Antia
Helioseismology has allowed us to study the structure of the Sun in unprecedented detail. One of the triumphs of the theory of stellar evolution was that helioseismic studies had s…
CME Propagation Characteristics from Radio Observations
S. Pohjolainen, L. van Driel-Gesztelyi, J. L. Culhane +2
We explore the relationship among three coronal mass ejections (CMEs), observed on 28 October 2003, 7 November 2004, and 20 January 2005, the type II burst-associated shock waves i…
Temporal Variations in the Sun's Rotational Kinetic Energy
H. M. Antia, S. M. Chitre, D. O. Gough
AIM: To study the variation of the angular momentum and the rotational kinetic energy of the Sun, and associated variations in the gravitational multipole moments, on a timescale o…
Stellar contents and star formation in the young star cluster Be 59
A. K. Pandey, Saurabh Sharma, K. Ogura +4
We present CCD photometry of the young open cluster Be 59 with the aim to study the star formation scenario in the cluster. The radial extent of the cluster is found to be…
Low radio frequency signatures of ram pressure stripping in Virgo spiral NGC 4254
N. G. Kantharia, A. Pramesh Rao, S. K. Sirothia
We report the detection of extended low radio frequency continuum emission beyond the optical disk of the spiral galaxy NGC 4254 using the Giant Metrewave Radio Telescope. NGC 4254…
Time lags in Narrow-line Seyfert 1 galaxies and the origin of their soft excess emission
G. C. Dewangan, R. E. Griffiths, A. R. Rao +1
The origin of soft X-ray excess emission from type 1 active galactic nuclei has remained a major problem for the last two decades. It has not been possible to distinguish alternati…
An investigation of the origin of soft X-ray excess emission from Narrow-line Seyfert 1 galaxies Akn564 and Mrk1044
G. C. Dewangan, R. E. Griffiths, Surajit Dasgupta +1
We investigate the origin of the soft X-ray excess emission from narrow-line Seyfert 1 galaxies Akn564 and Mrk1044 using XMM-Newton observations. We find clear evidence for time de…
Radio morphology and spectral analysis of cD galaxies in rich and poor galaxy clusters
S. Giacintucci, T. Venturi, M. Murgia +5
We present a radio morphological study and spectral analysis for a sample of 13 cD galaxies in rich and poor clusters of galaxies.} Our study is based on new high sensitivity Giant…
A multiwavelength study of Galactic HII region Sh2-294
M. R. Samal, A. K. Pandey, D. K. Ojha +3
We present the observational results of Galactic HII region S294, using optical photometry, narrow-band imaging and radio continuum mapping at 1280 MHz, together with archival data…
Evolution of Compact-Binary Populations in Globular Clusters: A Boltzmann Study. I. The Continuous Limit
Sambaran Banerjee, Pranab Ghosh
We explore a Boltzmann scheme for studying the evolution of compact binary populations of globular clusters. We include processes of compact-binary formation by tidal capture and e…
GMRT Observations of the 2006 outburst of the Nova RS Ophiuchi: First detection of emission at radio frequencies < 1.4 GHz
N. G. Kantharia, G. C. Anupama, T. P. Prabhu +4
The first low radio frequency (<1.4 GHz) detection of the outburst of the recurrent nova RS Ophiuchi is presented in this letter. Radio emission was detected at 0.61 GHz on day 20…
Star formation in young star cluster NGC 1893
Saurabh Sharma, A. K. Pandey, D. K. Ojha +6
We present a comprehensive multi-wavelength study of the star-forming region NGC 1893 to explore the effects of massive stars on low-mass star formation. Using near-infrared colour…
Seismic study of the chemical composition of the solar convection zone
Chia-Hsien Lin, H. M. Antia, Sarbani Basu
Recent downward revision of solar heavy-element abundances using three-dimensional atmospheric model has introduced serious discrepancies between standard solar models and heliosei…
Near-infrared Study of the Carina Nebula
Kaushar Sanchawala, Wen-Ping Chen, Devendra Ojha +6
We have carried out near-infrared (NIR) imaging observations of the Carina Nebula for an area of ~400 sq. arcmin. including the star clusters Trumpler 14 (Tr 14) and Trumpler 16 (T…
Further evidence for intra-night optical variability of radio-quiet quasars
A. Goyal, Gopal-Krishna, Ram Sagar +2
Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily sin…
Deep radio images of the HEGRA and Whipple TeV sources in the Cygnus OB2 region
Josep Marti, Josep M. Paredes, Ishwara Chandra C. H. +1
Context. The modern generation of Cherenkov telescopes has revealed a new population of gamma-ray sources in the Galaxy. Some of them have been identified with previously known X-r…
The AGN and Gas Disk in the Low Surface Brightness Galaxy PGC045080
M. Das, N. Kantharia, S. Ramya +3
We present radio observations and optical spectroscopy of the giant low surface brightness (LSB) galaxy PGC 045080 (or 1300+0144). PGC 045080 is a moderately distant galaxy having…
Bound for entropy and viscosity ratio for strange quark matter
Manjari Bagchi, Jishnu Dey, Mira Dey +4
High energy density ($\eps$) and temperature (T) links general relativity and hydrodynamics leading to a lower bound for the ratio of shear viscosity () and entropy density (…
The dependence of the estimated luminosities of ULX on spectral models
A. Senorita Devi, R. Misra, V. K. Agrawal +1
Data from {\it Chandra} observations of thirty nearby galaxies were analyzed and 365 X-ray point sources were chosen whose spectra were not contaminated by excessive diffuse emissi…
Critical properties of spherically symmetric accretion in a fractal medium
Nirupam Roy, Arnab K. Ray
Spherically symmetric transonic accretion of a fractal medium has been studied in both the stationary and the dynamic regimes. The stationary transonic solution is greatly sensitiv…
Electron acceleration in a post-flare decimetric continuum source
Prasad Subramanian, S. M. White, M. Karlický +3
Aims: To calculate the power budget for electron acceleration and the efficiency of the plasma emission mechanism in a post-flare decimetric continuum source. Methods: We have imag…
GMRT and VLA observations at 49cm and 20cm of the HII region near l=24.4d, b=0.1d
N. G. Kantharia, W. M. Goss, D. Anish Roshi +2
We report multifrequency radio continuum and hydrogen radio recombination line observations of HII regions near l=24.8d b=0.1d using the Giant Metrewave Radio Telescope (GMRT) at 1…