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14 papers · 2 filters
Measuring the spin of the primary black hole in OJ287
M. J. Valtonen, S. Mikkola, D. Merritt +7
The compact binary system in OJ287 is modelled to contain a spinning primary black hole with an accretion disk and a non-spinning secondary black hole. Using Post Newtonian (PN) ac…
Simultaneous observations of a pair of kilohertz QPOs and a plausible 1860 Hz QPO from an accreting neutron star system
Sudip Bhattacharyya
We report an indication (3.22 sigma) of ~ 1860 Hz quasi-periodic oscillations from a neutron star low-mass X-ray binary 4U 1636-536. If confirmed, this will be by far the highest f…
Studies of Quasi Periodic Oscillations in the Black Hole Transient XTE J 1817-330
Jayashree Roy, P. C. Agrawal, B. Paul +1
We have used archival RXTE PCA data to investigate timing and spectral characteristics of the transient XTE J1817-330. The data pertains to 160 PCA pointed observations made during…
An Fe XXVI Absorption Line in the Persistent Spectrum of the Dipping Low Mass X-ray Binary 1A 1744-361
Fotis P. Gavriil, Tod E. Strohmayer, Sudip Bhattacharyya
We report on Chandra X-ray Observatory (CXO) High-Energy Transmission Grating (HETG) spectra of the dipping Low Mass X-ray Binary (LMXB) 1A 1744-361 during its July 2008 outburst.…
Systematic variation in the apparent burning area of thermonuclear bursts and its implication for neutron star radius measurement
Sudip Bhattacharyya, M. Coleman Miller, Duncan K. Galloway
Precision measurements of neutron star radii can provide a powerful probe of the properties of cold matter beyond nuclear density. Beginning in the late 1970s it was proposed that…
The High-Metallicity Explosion Environment of the Relativistic Supernova 2009bb
E. M. Levesque, A. M. Soderberg, R. J. Foley +23
We investigate the environment of the nearby (d ~ 40Mpc) broad-lined Type Ic supernova SN 2009bb. This event was observed to produce a relativistic outflow likely powered by a cent…
A Relativistic Type Ibc Supernova Without a Detected Gamma-ray Burst
A. M. Soderberg, S. Chakraborti, G. Pignata +21
Long duration gamma-ray bursts (GRBs) mark the explosive death of some massive stars and are a rare sub-class of Type Ibc supernovae (SNe Ibc). They are distinguished by the produc…
Relativistic Lines and Reflection from the Inner Accretion Disks Around Neutron Stars
E. M. Cackett, J. M. Miller, D. R. Ballantyne +6
A number of neutron star low-mass X-ray binaries have recently been discovered to show broad, asymmetric Fe K emission lines in their X-ray spectra. These lines are generally thoug…
Energy Dependent time lags in the Seyfert 1 galaxy NGC 4593
K. Sriram, V. K. Agrawal, A. R. Rao
We investigate the energy-time lag dependence of the source NGC 4593 using XMM-{\it Newton}/EPIC-pn data. We found that the time lag dependency is linear in nature with respect to…
Associated Spectral and Temporal State Transition of the bright ULX NGC1313 X-1
G. C. Dewangan, R. Misra, A. R. Rao +1
(Abridged) Stellar mass black hole X-ray binaries exhibit X-ray spectral states which also have distinct and characteristic temporal properties. These states are believed to corres…
X-ray spectral evolution of the extragalactic Z-source, LMC X-2
V. K. Agrawal, R. Misra
We present the results obtained by a detailed study of the extragalactic Z source, LMC X-2, using broad band Suzaku data and a large ( ksec) data set obtained with the p…
A truncated accretion disk in the galactic black hole source H1743-322
K. Sriram, V. K. Agrawal, A. R. Rao
To investigate the geometry of the accretion disk in the source H1743-322, we have carried out a detailed X-ray temporal and spectral study using RXTE pointed observations. We have…
The Behavior of Matter under Extreme Conditions
F. Paerels, M. Mendez, M. Agueros +29
The cores of neutron stars harbor the highest matter densities known to occur in nature, up to several times the densities in atomic nuclei. Similarly, magnetic field strengths can…
Fractal features in accretion discs
Nirupam Roy, Arnab K. Ray
Fractal concepts have been introduced in the accretion disc as a new feature. Due to the fractal nature of the flow, its continuity condition undergoes modifications. The conserved…