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366 papers · 1 filter
Quasi-viscous accretion flow -- I: Equilibrium conditions and asymptotic behaviour
Jayanta K. Bhattacharjee, Atri Bhattacharya, Tapas K. Das +1
In a novel approach to studying viscous accretion flows, viscosity has been introduced as a perturbative effect, involving a first-order correction in the -viscosity parameter.…
325-MHz observations of the ELAIS-N1 field using the Giant Metrewave Radio Telescope
S. K. Sirothia, M . Dennefeld, D. J. Saikia +3
We present observations of the European Large-Area {\it ISO} Survey-North 1 (ELAIS-N1) at 325 MHz using the Giant Metrewave Radio Telescope (GMRT), with the ultimate objective of i…
Chandra Observations of Nuclear X-ray Emission from Low Surface Brightness Galaxies
M. Das, C. S. Reynolds, S. N. Vogel +2
We present Chandra detections of x-ray emission from the AGN in two giant Low Surface Brightness (LSB) galaxies, UGC 2936 and UGC 1455. Their x-ray luminosities are 1.8\times10^{42…
The origin of the diffuse non-thermal X-ray and radio emission in the Ophiuchus cluster of galaxies
Miguel A. Perez-Torres, Fabio Zandanel, Martin A. Guerrero +4
We present high resolution 240 and 607 MHz GMRT radio observations, complemented with 74 MHz archival VLA radio observations of the Ophiuchus cluster of galaxies, whose radio mini-…
The Seventh Data Release of the Sloan Digital Sky Survey
K. Abazajian
This paper describes the Seventh Data Release of the Sloan Digital Sky Survey (SDSS), marking the completion of the original goals of the SDSS and the end of the phase known as SDS…
Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe
A. Pélangeon, J. -L. Atteia, Y. E. Nakagawa +32
Aims: Taking advantage of the forthcoming Catalog of the HETE-2 mission, the aim of this paper is to evaluate the main properties of HETE-2 GRBs - the E_peak, the T_90 and the E_is…
Nonlinear Structure Formation, Backreaction and Weak Gravitational Fields
Aseem Paranjape
There is an ongoing debate in the literature concerning the effects of averaging out inhomogeneities (``backreaction'') in cosmology. In particular, some simple models of structure…
Orion's Bar: Physical Conditions across the Definitive H+ / H0 / H2 Interface
E. W. Pellegrini, J. A. Baldwin, G. J. Ferland +2
Previous work has shown the Orion Bar to be an interface between ionized and molecular gas, viewed roughly edge on, which is excited by the light from the Trapezium cluster. Much o…
GCRT J1742-3001: A New Radio Transient Towards the Galactic Center
Scott D. Hyman, Rudy Wijnands, T. Joseph W. Lazio +4
We report the detection of a new transient radio source, GCRT J1742-3001, located ~1 degree from the Galactic center. The source was detected ten times from late 2006 to 2007 May i…
Young Brown Dwarfs in the Core of the W3 Main Star-Forming Region
D. K. Ojha, M. Tamura, Y. Nakajima +4
We present the results of deep and high-resolution (FWHM ~ 0".35) JHK NIR observations with the Subaru telescope, to search for very low mass young stellar objects (YSOs) in the W3…
Can disk-magnetosphere interaction models and beat frequency models for quasi-periodic oscillation in accreting X-ray pulsars be reconciled?
E. Bozzo, L. Stella, M. Vietri +1
In this paper we review some aspects of the theory of magnetic threaded disks. We discuss in particular the equations that determine the position of the inner disk boundary by usin…
How do f-mode Frequencies Change with Solar Radius?
Piyali Chatterjee, H M. Antia
We test the relation between relative f-mode frequency variation and Lagrangian perturbation in the solar radius obtained by Dziembowski and Goode (2004) using several pairs of sol…
A QSO plus host system lensed into a 6" Einstein ring by a low redshift galaxy
Kajal K Ghosh, D. Narasimha
We report the serendipitous discovery of an "Einstein Ring" in the optical band from the Sloan Digital Sky Survey (SDSS) data and associated four images of a background source. The…
Forbush decreases and turbulence levels at CME fronts
Prasad Subramanian, H. M. Antia, S. R. Dugad +13
We seek to estimate the average level of MHD turbulence near coronal mass ejection (CME) fronts as they propagate from the Sun to the Earth. We examine the cosmic ray data from the…
Spectroscopic Confirmation of a Massive Red-Sequence-Selected Galaxy Cluster at z = 1.34 in the SpARCS-South Cluster Survey
Gillian Wilson, Adam Muzzin, H. K. C. Yee +10
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a z'-passband imaging survey, consisting of deep (z' ~ 24 AB) observations made from both hemispheres using th…
Spectroscopic Confirmation of Two Massive Red-Sequence-Selected Galaxy Clusters at z ~ 1.2 in the SpARCS-North Cluster Survey
Adam Muzzin, Gillian Wilson, H. K. C. Yee +10
The Spitzer Adaptation of the Red-sequence Cluster Survey (SpARCS) is a deep z'-band imaging survey covering the Spitzer SWIRE Legacy fields designed to create the first large homo…
A new interesting source in Chandra field: a pulsar wind nebula?
Sudip Bhattacharyya
We report the detection of a point source CXO J172337.5-373442 in a Chandra field with a high significance (26.7 sigma), and the discovery (4 sigma) of a 48" long X-ray tail emanat…
Deep low-frequency observations with the Giant Metrewave Radio Telescope: a search for relic radio emission
S. K. Sirothia, D. J. Saikia, C. H. Ishwara-Chandra +1
We present deep multifrequency observations using the Giant Metrewave Radio Telescope at 153, 244, 610 and 1260 MHz of a field centered on J0916+6348, to search for evidence of fos…
Eleven years of radio monitoring of the Type IIn supernova SN 1995N
Poonam Chandra, Christopher J. Stockdale, Roger A. Chevalier +6
We present radio observations of the optically bright Type IIn supernova SN 1995N. We observed the SN at radio wavelengths with the Very Large Array (VLA) for 11 years. We also obs…
Multi-wavelength study of a young open cluster NGC 7419
Himali Joshi, Brijesh Kumar, K. P. Singh +3
Using UBVRI Halpha CCD photometric observations and the archival NIR and X-ray data, we have carried out a multi-wavelength study of a young star cluster NGC 7419. An age of 22.5+/…
Magnetic Reconnection During the Two-Phase Evolution of a Solar Eruptive Flare
Bhuwan Joshi, Astrid Veronig, K. -S. Cho +6
We present a detailed multi-wavelength analysis and interpretation of the evolution of an M7.6 flare on October 24, 2003. The X-ray observations of the flare taken from the RHESSI…
J1420--0545: The radio galaxy larger than 3C236
J. Machalski, D. Kozieł-Wierzbowska, M. Jamrozy +1
We report the discovery of the largest giant radio galaxy, J1420-0545: a FR type II radio source with an angular size of 17.4' identified with an optical galaxy at z=0.3067. Thus,…
Sensitivity of PDR Calculations to Microphysical Details
N. P. Abel, P. A. M. van Hoof, G. Shaw +2
Our understanding of physical processes in Photodissociation regions or Photon Dominated Regions (PDRs) largely depends on the ability of spectral synthesis codes to reproduce the…
The Photon Dominated Region in the IC 348 molecular cloud
K. Sun, V. Ossenkopf, C. Kramer +4
In this paper we discuss the physical conditions of clumpy nature in the IC 348 molecular cloud. We combine new observations of fully sampled maps in [C I] at 492 GHz and 12CO 4--3…