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28 papers · 2 filters
Photo-Disintegration of Heavy Nuclei at the Core of Cen A
Esha Kundu, Nayantara Gupta
Fermi LAT has detected gamma ray emissions from the core of Cen A. More recently, a new component in the gamma ray spectrum from the core has been reported in the energy range of 4…
The optical rebrightening of GRB100814A: an interplay of forward and reverse shocks?
Massimiliano De Pasquale, N. P. M. Kuin, S. Oates +36
We present a wide dataset of gamma-ray, X-ray, UVOIR, and radio observations of the Swift GRB100814A. At the end of the slow decline phase of the X-ray and optical afterglow, this…
Electron Cooling in a Young Radio Supernova: SN 2012aw
Naveen Yadav, Alak Ray, Sayan Chakraborti +8
We present the radio observations and modeling of an optically bright Type II-P supernova (SN), SN 2012aw which exploded in the nearby galaxy Messier 95 (M95) at a distance of $10\…
Radio observations of GRB 100418a: Test of an energy injection model explaining long-lasting GRB afterglows
A. Moin, P. Chandra, J. C. A. Miller-Jones +6
We present the results of our radio observational campaign on GRB 100418a, for which we used the Australia Telescope Compact Array (ATCA), Very Large Array (VLA) and the Very Long…
Comparison of time/phase lags in the hard state and plateau state of GRS 1915+105
Mayukh Pahari, Joseph Neilsen, J S Yadav +2
We investigate the complex behavior of energy- and frequency-dependent time/phase lags in the plateau state and the radio-quiet hard state of GRS 1915+105. In our timing analysis,…
Interpreting the large amplitude X-ray variation of GRS 1915+105 and IGR J17091-3624 as modulations of an accretion disc
Mayukh Pahari, Ranjeev Misra, Arunava Mukherjee +2
Using the flux resolved spectroscopy for the first time, we analyse the RXTE/PCA data of the black hole X-ray binaries GRS 1915+105 and IGR J17091-3624, when both sources show larg…
X-ray Emission from Magnetic Cataclysmic Variables
K. P. Singh
I present a brief review of the present status of X-ray emission from Magnetic Cataclysmic Variables (MCVs). A short introduction to the types of Cataclysmic Variables (CVs) is fol…
Properties of unique hard X-ray dips observed from GRS 1915+105 and IGR J17091-3624 and their implications
Mayukh Pahari, J. S. Yadav, Jerome Rodriguez +3
We report a comprehensive study on spectral and timing properties of hard X-ray dips uniquely observed in some so-called variability classes of the micro-quasars GRS 1915+105 and I…
Pulse-wise Amati correlation in Fermi GRBs
Rupal Basak, A. R. Rao
We make a detailed pulse-wise study of gamma-ray bursts (GRBs) with known redshift detected by \emph{Fermi}/Gamma Ray Burst Monitor (GBM). The sample contains 19 GRBs with 43 pulse…
A combined GMRT/CLFST image of IC443 at 150 MHz
D. Mitra, D. A. Green, A. Pramesh Rao
IC443 is a relatively large Galactic (~45 arcmin) SNR with a high radio surface brightness. It has fine scale structure down to arcsec scales, and so is difficult to image on all a…
Modeling gamma ray production from proton-proton interactions in high-energy astrophysical environments
Dimitra Atri, B. Hariharan
Gamma rays are the best probes to study high-energy particle interactions occurring in astrophysical environments. Space based instruments such as Fermi Large Area Telescope (Fermi…
Search for long-lived gravitational-wave transients coincident with long gamma-ray bursts
The LIGO Scientific Collaboration, the Virgo Collaboration, J. Aasi +875
Long gamma-ray bursts (GRBs) have been linked to extreme core-collapse supernovae from massive stars. Gravitational waves (GW) offer a probe of the physics behind long GRBs. We inv…
Gravitational waves from known pulsars: results from the initial detector era
J. Aasi, J. Abadie, B. P. Abbott +892
We present the results of searches for gravitational waves from a large selection of pulsars using data from the most recent science runs (S6, VSR2 and VSR4) of the initial generat…
Time resolved spectral analysis of the prompt emission of long gamma ray bursts with GeV Emission
A. R. Rao, Rupal Basak, J. Bhattacharya +4
We make a detailed time resolved spectroscopy of bright long gamma ray bursts (GRBs) which show significant GeV emissions (GRB 080916C, GRB 090902B, and GRB 090926A). In addition t…
Galactic cosmic ray induced radiation dose on terrestrial exoplanets
Dimitra Atri, B. Hariharan, Jean-Mathias Griessmeier
This past decade has seen tremendous advancements in the study of extrasolar planets. Observations are now made with increasing sophistication from both ground and space-based inst…
Biological radiation dose from secondary particles in a Milky Way gamma ray burst
Dimitra Atri, Adrian L. Melott, Andrew Karam
Gamma ray bursts (GBRs) are a class of highly energetic explosions emitting radiation in a very short timescale of a few seconds and with a very narrow opening angle. Although, all…
A panchromatic view of the restless SN2009ip reveals the explosive ejection of a massive star envelope
R. Margutti, D. Milisavljevic, A. M. Soderberg +54
The 2012 explosion of SN2009ip raises questions about our understanding of the late stages of massive star evolution. Here we present a comprehensive study of SN2009ip during its r…
High Energy Emission Processes in OJ 287 during 2009 Flare
Pankaj Kushwaha, S. Sahayanathan, K. P. Singh
The broadband spectrum of a BL Lac object, OJ 287, from radio to -rays obtained during a major -ray flare detected by \emph{Fermi} in 2009 are studied to understand the high…
A Reverse Shock in GRB 130427A
T. Laskar, E. Berger, B. A. Zauderer +7
We present extensive radio and millimeter observations of the unusually bright GRB 130427A at z=0.340, spanning 0.67 to 12 days after the burst. Taken in conjunction with detailed…
The Second Fermi Large Area Telescope Catalog of Gamma-ray Pulsars
LAT collaboration
This catalog summarizes 117 high-confidence > 0.1 GeV gamma-ray pulsar detections using three years of data acquired by the Large Area Telescope (LAT) on the Fermi satellite. Half…
Determining neutron star masses and radii using energy-resolved waveforms of X-ray burst oscillations
Ka-Ho Lo, M. Coleman Miller, Sudip Bhattacharyya +1
Simultaneous, precise measurements of the mass and radius of neutron stars can yield uniquely valuable information about the still uncertain properties of cold matter at se…
GMRT discovery of PSR J1544+4937, an eclipsing black-widow pulsar identified with a Fermi LAT source
B. Bhattacharyya, J. Roy, P. S. Ray +17
Using the Giant Metrewave Radio Telescope (GMRT) we performed deep observations to search for radio pulsations in the directions of unidentified Fermi Large Area Telescope (LAT) ga…
White Paper for Blazar Observations with a GEMS-like X-ray Polarimetry Mission
Henric Krawczynski, Lorella Angelini, Matthew Baring +27
In this document, we describe the scientific potential of blazar observations with a X-ray polarimetry mission like GEMS (Gravity and Extreme Magnetism SMEX). We describe five blaz…
A possible evolutionary scenario of highly magnetized super-Chandrasekhar white dwarfs: progenitors of peculiar type Ia supernovae
Upasana Das, Banibrata Mukhopadhyay, A. R. Rao
Several recently discovered peculiar type Ia supernovae seem to demand an altogether new formation theory that might help explain the puzzling dissimilarities between them and the…