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54 papers · 2 filters
A Single spark model for PSR J21443933
Dipanjan Mitra, Rahul Basu, George I. Melikidze +1
The partially screened vacuum gap model (PSG) for the inner acceleration region in normal radio pulsars, a variant of the pure vacuum gap model, attempts to account for the observe…
Observed glitches in 8 young pulsars
Avishek Basu, Bhal Chandra Joshi, M. A. Krishnakumar +5
The abrupt change in the pulse period of a pulsar is called a pulsar glitch. In this paper, we present eleven pulsar glitches detected using the Ooty Radio Telescope (ORT) and the…
Periodic Modulation : Newly emergent emission behaviour in Pulsars
Rahul Basu, Dipanjan Mitra, Giorgi I. Melikidze
Periodic modulations are seen in normal period pulsars ( 0.1 sec) over timescales ranging from a few seconds to several minutes. Such modulations have usually been associated…
Unravelling the unusually curved X-ray spectrum of RGB J0710+591 using AstroSat observations
Pranjupriya Goswami, Atreyee Sinha, Sunil Chandra +7
We report the analysis of simultaneous multi-wavelength data of the high energy peaked blazar RGB J0710+591 from the LAXPC, SXT and UVIT instruments on-board AstroSat. The wide ban…
Estimation of the jet inclination angle for the TDE Swift J1644+57
Sudip Chakraborty, Sudip Bhattacharyya, Chandrachur Chakraborty +1
An estimate of the jet inclination angle relative to the accreting black hole's spin can be useful to probe the jet triggering mechanism and the disc--jet coupling. A Tidal Disrupt…
Type IIP Supernova Progenitors II: Stellar Mass and Obscuration by the Dust in the Circumstellar Medium
Gururaj A. Wagle, Alak Ray
It has been well established from a variety of observations that red supergiants (RSGs) loose a lot of mass in stellar wind. Dust formed in this emitted gas over a few decades befo…
New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz
K. Rajpurohit, M. Hoeft, F. Vazza +10
Radio relics are diffuse extended synchrotron sources that originate from shock fronts induced by galaxy cluster mergers. The actual particle acceleration mechanism at the shock fr…
Long term variability and correlation study of the blazar 3C 454.3 in radio, NIR and optical wavebands
A. Sarkar, V. R. Chitnis, A. C. Gupta +11
We performed a long-term optical (B, V, R bands), infra-red (J and K bands) and radio band (15, 22, 37 GHz band) study on the flat spectrum radio quasar, 3C 454.3, using the data c…
Chandra Observations of the Spectacular A3411-12 Merger Event
Felipe Andrade-Santos, Reinout J. van Weeren, Gabriella Di Gennaro +17
We present deep Chandra observations of A3411-12, a remarkable merging cluster that hosts the most compelling evidence for electron re-acceleration at cluster shocks to date. Using…
On the Rate of Neutron Star Binary Mergers from Globular Clusters
Claire S. Ye, Wen-fai Fong, Kyle Kremer +4
The first detection of gravitational waves from a neutron star - neutron star (NS-NS) merger, GW170817, and the increasing number of observations of short gamma-ray bursts (SGRBs)…
Investigating Particle Acceleration in the Wolf-Rayet Bubble G2.4+1.4
Prachi Prajapati, Anandmayee Tej, Santiago del Palacio +5
The supersonic winds produced by massive stars carry a large amount of kinetic power. In numerous scenarios such winds have been proven to produce shocks in which relativistic part…
Super-giant pulses from the Crab pulsar : Energy distribution and occurrence rate
Apurba Bera, Jayaram N. Chengalur
We present statistical analysis of a fluence limited sample of over 1100 giant pulses from the Crab pulsar, with fluence > 130 Jy ms at ~1330 MHz. These were detected in ~260 hours…
Arecibo 4.5/1.4/0.33-GHz Polarimetric Single-Pulse Emission Survey
Timothy E. E. Olszanski, Dipanjan Mitra, Joanna Rankin
We report on an Arecibo 4.5-GHz polarimetric single-pulse survey of the brightest pulsars at high frequency within its sky. The high frequency profiles are accompanied by a collect…
Long Term Variability of a Black Widow's Eclipses -- A Decade of PSR J20510827
E. J. Polzin, R. P. Breton, B. W. Stappers +5
In this paper we report on years of observations of PSR J20510827, at radio frequencies in the range 110--4032 MHz. We investigate the eclipse phenomena of this black w…
Distinct properties of the radio burst emission from the magnetar XTE J1810-197
Yogesh Maan, Bhal Chandra Joshi, Mayuresh P. Surnis +2
XTE J1810-197 (PSR J1809-1943) was the first ever magnetar which was found to emit transient radio emission. It has recently undergone another radio and high-energy outburst. This…
Time varying polarized gamma-rays from GRB 160821A: evidence for ordered magnetic fields
Vidushi Sharma, Shabnam Iyyani, Dipankar Bhattacharya +8
GRB 160821A is the third most energetic gamma ray burst observed by the {\it Fermi} gamma-ray space telescope. Based on the observations made by Cadmium Zinc Telluride Imager (CZTI…
Probing the Survival of Planetary Systems in Globular Clusters with Tidal Disruption Events
Kyle Kremer, Daniel J. D'Orazio, Johan Samsing +2
Among the growing list of confirmed exoplanets, the number of planets identified in dense star clusters remains sparse. Previous analyses have suggested this may be due in part to…
An Optically Targeted Search for Gravitational Waves emitted by Core-Collapse Supernovae during the First and Second Observing Runs of Advanced LIGO and Advanced Virgo
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1195
We present the results from a search for gravitational-wave transients associated with core-collapse supernovae observed within a source distance of approximately 20 Mpc during the…
Evaluating the Evidence of Multipolar Surface Magnetic Field in PSR J01081431
Prakash Arumugasamy, Dipanjan Mitra
PSR J01081431 is an old pulsar where the X-ray emission is expected to have a thermal component from the polar cap and a non-thermal component from the magnetosphere. Although t…
The frequency-dependent behaviour of subpulse drifting: I. Carousel geometry and emission heights of PSR B0031-07
S. J. McSweeney, N. D. R. Bhat, G. Wright +2
The carousel model of pulsar emission attributes the phenomenon of subpulse drifting to a set of discrete sparks located very near the stellar surface rotating around the magnetic…
Study of Particle Multiplicity of Cosmic Ray Events using 2m2m Resistive Plate Chamber Stack at IICHEP-Madurai
Suryanarayan Mondal, V. M. Datar, Gobinda Majumder +4
An experimental setup consisting of 12 layers of glass Resistive Plate Chambers (RPCs) of size 2\,m\,\,2\,m has been built at IICHEP-Madurai (\ang{9;56;14.5}\,N \ang{78;00;…
A variable-frequency HFQPO in GRS 1915+105 as observed with Astrosat
Tomaso M. Belloni, Dipankar Bhattacharya, Pietro Caccese +3
From the analysis of more than 92 ks of data obtained with the laxpc instrument on board Astrosat we have detected a clear high-frequency QPO whose frequency varies between 67.4 an…
Accretion Disk Parameters determined from the great 2015 flare of OJ 287
Mauri J. Valtonen, Staszek Zola, Pauli Pihajoki +17
In the binary black hole model of OJ 287 the secondary black hole orbits a much more massive primary, and impacts on the primary accretion disk at predictable times. We update the…
Search for Eccentric Binary Black Hole Mergers with Advanced LIGO and Advanced Virgo during their First and Second Observing Runs
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1183
When formed through dynamical interactions, stellar-mass binary black holes may retain eccentric orbits ( at 10 Hz) detectable by ground-based gravitational-wave detectors.…