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38 papers · 2 filters
AstroSat/LAXPC observation of Cygnus X-1 in the hard state
Ranjeev Misra, J S Yadav, Jai Verdhan Chauhan +10
We report the first analysis of data from AstroSat/LAXPC observations of Cygnus X-1 in January 2016. LAXPC spectra reveals that the source was in the canonical hard state, represen…
The Effect of Transient Accretion on the Spin-Up of Millisecond Pulsars
Sudip Bhattacharyya, Deepto Chakrabarty
A millisecond pulsar is a neutron star that has been substantially spun up by accretion from a binary companion. A previously unrecognized factor governing the spin evolution of su…
Gamma Ray Bursts -- A radio perspective
Poonam Chandra
Gamma-ray bursts (GRBs) are extremely energetic events at cosmological distances. They provide unique laboratory to investigate fundamental physical processes under extreme conditi…
On the spectral curvature of VHE blazar 1ES\,1011+496: Effect of spatial particle diffusion
Atreyee Sinha, S. Sahayanathan, B. S. Acharya +3
A detailed multi-epoch study of the broadband spectral behaviour of the very high energy (VHE) source, 1ES\,1011+496, provides us with valuable information regarding the underlying…
Search for Gravitational Waves Associated with Gamma-Ray Bursts During the First Advanced LIGO Observing Run and Implications for the Origin of GRB 150906B
LIGO Scientific Collaboration, Virgo Collaboration, IPN Collaboration +1002
We present the results of the search for gravitational waves (GWs) associated with -ray bursts detected during the first observing run of the Advanced Laser Interferometer Gravi…
Explosive and radio-selected Transients: Transient Astronomy with SKA and its Precursors
Poonam Chandra, G. C. Anupama, K. G. Arun +7
With the high sensitivity and wide-field coverage of the Square Kilometre Array (SKA), large samples of explosive transients are expected to be discovered. Radio wavelengths, espec…
Neutron Star Physics in the Square Kilometer Array Era : An Indian Perspective
Sushan Konar, Manjari Bagchi, Debades Bandyopadhyay +14
It is an exceptionally opportune time for Astrophysics when a number of next-generation mega-instruments are poised to observe the universe across the entire electromagnetic spectr…
Geographic and seasonal influences on optical followup of gravitational wave events
Varun Srivastava, Varun Bhalerao, Aravind P. Ravi +2
We investigate the effects of observatory locations on the probability of discovering optical/infrared counterparts of gravitational wave sources. We show that for the LIGO--Virgo…
Differentially Rotating White Dwarfs I: Regimes of Internal Rotation
Pranab Ghosh, J. Craig Wheeler
Most viable models of Type Ia supernovae (SN~Ia) require the thermonuclear explosion of a carbon/oxygen white dwarf that has evolved in a binary system. Rotation could be an import…
Multi-wavelength Temporal Variability of the Blazar 3C 454.3 during 2014 Activity Phase
Pankaj Kushwaha, Alok C. Gupta, Ranjeev Misra +1
We present a multi-wavelength temporal analysis of the blazar 3C 454.3 during the high -ray active period from May-December, 2014. Except for X-rays, the period is well sampled…
AstroSat CZT Imager observations of GRB 151006A: timing, spectroscopy, and polarisation study
A. R. Rao, Vikas Chand, M. K. Hingar +24
AstroSat is a multi-wavelength satellite launched on 2015 September 28. The CZT Imager of AstroSat on its very first day of operation detected a long duration gamma-ray burst (GRB)…
AstroSat/LAXPC reveals the high energy variability of GRS 1915+105 in the chi class
J S Yadav, Ranjeev Misra, Jai Verdhan Chauhan +10
We present the first quick look analysis of data from nine {\it AstroSat}'s LAXPC observations of GRS 1915+105 during March 2016 when the source had the characteristics of being in…
A shock in `El Gordo' cluster and the origin of the radio relic
A. Botteon, F. Gastaldello, G. Brunetti +1
We present an X-ray and radio study of the famous `El Gordo', a massive and distant () galaxy cluster. In the deep (340 ks) Chandra observation, the cluster appears with an…
Constraining the X-ray AGN halo occupation distribution: implications for eROSITA
Priyanka Singh, Alexandre Refregier, Subhabrata Majumdar +1
The X-ray emission from active galactic nucleus (AGN) is a major component of extragalactic X-ray sky. In this paper, we use the X-ray luminosity function (XLF) and halo occupation…
Upper limits on the rates of binary neutron star and neutron-star--black-hole mergers from Advanced LIGO's first observing run
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +958
We report here the non-detection of gravitational waves from the merger of binary neutron star systems and neutron-star--black-hole systems during the first observing run of Advanc…
Gravitomagnetic effect in magnetized neutron stars
Debarati Chatterjee, Chandrachur Chakraborty, Debades Bandyopadhyay
Rotating bodies in General Relativity produce frame dragging, also known as the {\it gravitomagnetic effect} in analogy with classical electromagnetism. In this work, we study the…
Search for transient gravitational waves in coincidence with short duration radio transients during 2007-2013
The LIGO Scientific Collaboration, the Virgo Collaboration, others +999
We present an archival search for transient gravitational-wave bursts in coincidence with 27 single pulse triggers from Green Bank Telescope pulsar surveys, using the LIGO, Virgo a…
Pulse-wise GRB correlation: implication as a cosmological tool
Rupal Basak, A. R. Rao
Gamma-ray bursts (GRBs) are cosmological explosions which carry valuable information from the distant past of the expanding universe. One of the greatest discoveries in modern cosm…
Supplement: The Rate of Binary Black Hole Mergers Inferred from Advanced LIGO Observations Surrounding GW150914
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +964
Supplemental information for a Letter reporting the rate of binary black hole (BBH) coalescences inferred from 16 days of coincident Advanced LIGO observations surrounding the tran…
Anisotropy of partially self-absorbed jets and the jet of Cyg X-1
Andrzej A. Zdziarski, Debdutta Paul, Ruaraidh Osborne +1
We study the angular dependence of the flux from partially synchrotron self-absorbed conical jets (proposed by Blandford \& K{ö}nigl). We consider the jet viewed from either a side…
Time-domain and spectral properties of pulsars at 154 MHz
M. E. Bell, Tara Murphy, S. Johnston +35
We present 154 MHz Murchison Widefield Array imaging observations and variability information for a sample of pulsars. Over the declination range we…
Soft gamma-ray repeaters and anomalous X-ray pulsars as highly magnetized white dwarfs
Banibrata Mukhopadhyay, A. R. Rao
We explore the possibility that soft gamma-ray repeaters (SGRs) and anomalous X-ray pulsars (AXPs) are powered by highly magnetized white dwarfs (B-WDs). We take a sample of SGRs a…
Evidence for two Lognormal States in Multi-wavelength Flux Variation of FSRQ PKS 1510-089
Pankaj Kushwaha, Sunil Chandra, Ranjeev Misra +3
We present a systematic characterization of multi-wavelength emission from blazar PKS 1510-089 using well-sampled data at infrared(IR)-optical, X-ray and -ray energies. The resu…
On the evolution of the inner disk radius with flux in the neutron star low-mass X-ray binary Serpens X-1
Chia-Ying Chiang, Robert A. Morgan, Edward M. Cackett +3
We analyze the latest \emph{Suzaku} observation of the bright neutron star low-mass X-ray binary Serpens X-1 taken in 2013 October and 2014 April. The observation was taken using t…