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13 papers · 2 filters
Ultra High Energy Cosmic Ray Acceleration in Engine-driven Relativistic Supernovae
Sayan Chakraborti, Alak Ray, Alicia Soderberg +2
The origin of the highest energy cosmic rays remains an enigma. They offer a window to new physics, including tests of physical laws relevant to their propagation and interactions,…
Detection of GRB 090618 with RT-2 Experiment Onboard the Coronas-Photon Satellite
A. R. Rao, J. P. Malkar, M. K. Hingar +16
We present the results of an analysis of the prompt gamma-ray emission from GRB 090618 using the RT-2 Experiment onboard the Coronas-Photon satellite. GRB 090618 shows multiple pea…
Understanding the X-ray luminosity function of high mass X-ray binaries
Harshal Bhadkamkar, Pranab Ghosh
High mass X-ray binary luminosity function (XLF) is an important tool for studying binary evolution processes and also the mass loss and consequent evolution in massive stars. We c…
A Detection of an Anti-correlated Hard X-ray Lag in AM Herculis
K. Sriram, C. S. Choi, A. R. Rao
Context {Earlier cross-correlation studies for AM Her were performed in various energy range from optical to X-ray and suggested that it mostly shows a high level of correlation bu…
Anti-correlated Soft Lags in the Intermediate State of Black Hole Source GX 339-4
K. Sriram, A. R. Rao, C. S. Choi
We report the few hundred second anti-correlated soft lags between soft and hard energy bands in the source GX 339-4 using RXTE observations. In one observation, anti-correlated so…
An Expanding Neutral Hydrogen Supershell Evacuated by Multiple Supernovae in M101
Sayan Chakraborti, Alak Ray
Several neutral hydrogen (HI) cavities have been detected in the Milky Way and other nearby star forming galaxies. It has been suggested that at least a fraction of them may be exp…
Baryon Loaded Relativistic Blastwaves in Supernovae
Sayan Chakraborti, Alak Ray
We provide a new analytic blastwave solution which generalizes the Blandford-McKee solution to arbitrary ejecta masses and Lorentz factors. Until recently relativistic supernovae h…
On Relativistic Disk Spectroscopy in Compact Objects with X-ray CCD Cameras
J. M. Miller, A. D'Ai, M. W. Bautz +11
X-ray charge-coupled devices (CCDs) are the workhorse detectors of modern X-ray astronomy. Typically covering the 0.3-10.0 keV energy range, CCDs are able to detect photoelectric a…
Ultra-High Energy Cosmic Rays from Centaurus A: Jet Interaction with Gaseous Shells
Gopal-Krishna, Peter L. Biermann, Vitor de Souza +1
Ultra high energy cosmic rays (UHECRs), with energies above ~6 x 10^19 eV, seem to show a weak correlation with the distribution of matter relatively near to us in the universe. It…
Spectral Lag Relations in GRB Pulses Detected with HETE-2
M. Arimoto, N. Kawai, K. Asano +36
Using a pulse-fit method, we investigate the spectral lags between the traditional gamma-ray band (50-400 keV) and the X-ray band (6-25 keV) for 8 GRBs with known redshifts (GRB 01…
X-ray views of neutron star low-mass X-ray binaries
Sudip Bhattacharyya
A neutron star low-mass X-ray binary is a binary stellar system with a neutron star and a low-mass companion star rotating around each other. In this system the neutron star accret…
New X-ray observations of the Geminga pulsar wind nebula
G. G. Pavlov, S. Bhattacharyya, V. E. Zavlin
Previous observations of the middle-aged pulsar Geminga with XMM-Newton and Chandra have shown an unusual pulsar wind nebula (PWN), with a 20" long central (axial) tail directed op…
Measurement of neutron star parameters: a review of methods for low-mass X-ray binaries
Sudip Bhattacharyya
Measurement of at least three independent parameters, for example, mass, radius and spin frequency, of a neutron star is probably the only way to understand the nature of its supra…