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17 papers · 2 filters
Coupled HBO and NBO variations in the Z source GX 5-1: inner accretion disk as the location of QPOs
K. Sriram, A. R. Rao, C. S. Choi
The simultaneous and coupled evolution of horizontal branch oscillation (HBO) and normal branch oscillation (NBO) in Z-type sources suggests that the production of HBO is connected…
Collective Properties of X-ray Binary Populations of Galaxies. I. Luminosity and Orbital Period Distributions of High-Mass X-ray Binaries
Harshal Bhadkamkar, Pranab Ghosh
We introduce a method for obtaining the X-ray luminosity function (XLF) and the binary-period distribution of populations of high-mass X-ray binaries (HMXBs) in the stellar fields…
Accelerated Orbital Expansion And Secular Spin Down of the Accreting Millisecond Pulsar SAX J1808.4-3658
A. Patruno, P. Bult, A. Gopakumar +4
The accreting millisecond pulsar SAX J1808.4-3658 has shown a peculiar orbital evolution in the past with an orbital expansion much faster than expected from standard binary evolut…
Multiwavelength study of TeV Blazar Mrk421 during giant flare and observations of TeV AGNs with HAGAR
A. Shukla, P. R. Vishwanath, G. C. Anupama +7
The radiation mechanism of very high energy -ray emission from blazars and crucial parameters like magnetic field, and size of the emitting region are not well understood yet. T…
Measuring the pulse of GRB 090618: A Simultaneous Spectral and Timing Analysis of the Prompt Emission
Rupal Basak, A. R. Rao
We develop a new method for simultaneous timing and spectral studies of Gamma Ray Burst (GRB) prompt emission and apply it to make a pulse-wise description of the prompt emission o…
PSR J1903+0327 : A Unique Milli-Second Pulsar with a Main-Sequence Companion Star
Juthika Khargharia, John T. Stocke, Cynthia S. Froning +2
PSR J1903+0327 is a mili-second pulsar with a mass of 1.67 M_{\odot} in a highly eccentric orbit (e=0.44) around a main-sequence star. This unique system cannot be reconciled with…
Ways to constrain neutron star equation of state models using relativistic disc lines
Sudip Bhattacharyya
Relativistic spectral lines from the accretion disc of a neutron star low-mass X-ray binary can be modelled to infer the disc inner edge radius. A small value of this radius tentat…
Timing and spectral study of XB 1254-690 using new RXTE PCA data
Arunava Mukherjee, Sudip Bhattacharyya
We have analyzed the new Rossi X-ray Timing Explorer Proportional Counter Array data of the atoll neutron star (NS) low-mass X-ray binary (LMXB) system XB 1254-690. The colour-colo…
The central point source in G76.9+1.0
V. R. Marthi, J. N. Chengalur, Y. Gupta +2
We describe the serendipitous discovery of a radio point source in a 618 MHz image of the supernova remnant(SNR) G76.9+1.0. The SNR has a bipolar structure and the point source is…
X-ray spectral state evolution in IGR J17091-3624 and comparison of its heartbeat oscillation properties with those of GRS 1915+105
Mayukh Pahari, J. S. Yadav, Sudip Bhattacharyya
In this work, we study the X-ray timing and spectral evolution of the transient low mass X-ray binary IGR J17091-3624 during first 66 days of its 2011 outburst. We present results…
Afterglows of Mildly Relativistic Supernovae: Baryon Loaded Blastwaves
Sayan Chakraborti, Alak Ray
Relativistic supernovae have been discovered until recently only through their association with long duration Gamma Ray Bursts (GRB). As the ejecta mass is negligible in comparison…
Engine-driven Relativistic Supernovae as Sources of Ultra High Energy Cosmic Rays
Alak Ray, Sayan Chakraborti
Understanding the origin of the highest energy cosmic rays is a crucial step in probing new physics at energies unattainable by terrestrial accelerators. Their sources remain an en…
Highly coherent kilohertz quasi-periodic oscillations from a neutron star X-ray binary EXO 1745-248
Arunava Mukherjee, Sudip Bhattacharyya
We report the discovery () of kilohertz quasi-periodic oscillations (kHz QPOs) at ~ 690 Hz from the transient neutron star low-mass X-ray binary EXO 1745-248. We find that thi…
A Fast X-ray Disk Wind in the Transient Pulsar IGR J17480-2446 in Terzan 5
Jon M. Miller, Dipankar Maitra, Edward M. Cackett +2
Accretion disk winds are revealed in Chandra gratings spectra of black holes. The winds are hot and highly ionized (typically composed of He-like and H-like charge states), and sho…
X-ray bursts from the Terzan 5 transient IGR J17480-2446: nuclear rather than gravitational
Manoneeta Chakraborty, Sudip Bhattacharyya
The 2010 outburst of the transient neutron star low-mass X-ray binary IGR J17480-2446 has exhibited a series of unique X-ray bursts, as well as millihertz (mHz) quasi-periodic osci…
Terzan 5 transient IGR J17480-2446: variation of burst and spectral properties with spectral states
Manoneeta Chakraborty, Sudip Bhattacharyya, Arunava Mukherjee
We study the spectral state evolution of the Terzan 5 transient neutron star low-mass X-ray binary IGR J17480-2446, and how the best-fit spectral parameters and burst properties ev…
Hysteresis in the spectral states of the neutron star low-mass X-ray binary EXO 1745-248
Arunava Mukherjee, Sudip Bhattacharyya
We study the low-frequency timing properties and the spectral state evolution of the transient neutron star low-mass X-ray binary EXO 1745-248 using the entire Rossi X-ray Timing E…