40.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.3k papers
- Panjab UniversityIN2.1k papers
- Korea UniversityKR1.9k papers
- Sungkyunkwan UniversityKR1.9k papers
- Charles UniversityCZ1.9k papers
- Princeton UniversityUS1.9k papers
- Institute of High Energy PhysicsCN1.8k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.8k papers
- National Central UniversityTW1.8k papers
- Kyungpook National UniversityKR1.8k papers
- University of Maryland, College ParkUS1.8k papers
- University of California, RiversideUS1.8k papers
43 papers · 2 filters
A new enigmatic radio relic in the low mass cluster Abell 2108
Swarna Chatterjee, Majidul Rahaman, Abhirup Datta +2
We report the discovery of a radio relic in the northeastern periphery of the cluster Abell 2108 (A2108). A2108 is a part of the uGMRT LOw-MAss Galaxy Cluster Survey (GLOMACS), whe…
Revealing Physical Properties of a Tidal Disruption Event: iPTF16fnl
Mageshwaran Tamilan, Gargi Shaw, Sudip Bhattacharyya +1
Tidal disruption event (TDE) iPTF16fnl shows a relatively low optical flare with observationally very weak X-ray emission and the spectroscopic property that the helium emission li…
Low-frequency pulse-jitter measurement with the uGMRT I : PSR J04374715
Tomonosuke Kikunaga, Shinnosuke Hisano, Neelam Dhanda Batra +22
High-precision pulsar timing observations are limited in their accuracy by the jitter noise that appears in the arrival time of pulses. Therefore, it is important to systematically…
Topology of Pulsar Profiles (ToPP). I. Graph theory method and classification of the EPN
D. Vohl, J. van Leeuwen, Y. Maan
Some of the most important information on a radio pulsar is derived from its average pulse profile. Many early pulsar studies were necessarily based on only few such profiles. Ther…
The NANOGrav 12.5-year data set: A computationally efficient eccentric binary search pipeline and constraints on an eccentric supermassive binary candidate in 3C 66B
Gabriella Agazie, Zaven Arzoumanian, Paul T. Baker +85
The radio galaxy 3C 66B has been hypothesized to host a supermassive black hole binary (SMBHB) at its center based on electromagnetic observations. Its apparent 1.05-year period an…
On the need of an ultramassive black hole in OJ 287
Mauri J. Valtonen, Staszek Zola, Achamveedu Gopakumar +25
The highly variable blazar OJ~287 is commonly discussed as an example of a binary black hole system. The 130 year long optical light curve is well explained by a model where the ce…
Observational Implications of OJ 287's Predicted 2022 Disk Impact in the Black Hole Binary Model
Mauri J. Valtonen, Lankeswar Dey, Achamveedu Gopakumar +24
We present a summary of the results of the OJ 287 observational campaign, which was carried out during the 2021/2022 observational season. This season is special in the binary mode…
Multiwavelength Constraints on the Origin of a Nearby Repeating Fast Radio Burst Source in a Globular Cluster
Aaron B. Pearlman, Paul Scholz, Suryarao Bethapudi +26
The precise origins of fast radio bursts (FRBs) remain unknown. Multiwavelength observations of nearby FRB sources can provide important insights into the enigmatic FRB phenomenon.…
Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat
Nazma Husain, Yash Bhargava, Akash Garg +3
4U 1543-47 underwent its brightest outburst in 2021 after two decades of inactivity. During its decay phase, AstroSat conducted nine observations of the source spanning from July $…
Coronal Properties of Low-Accreting AGNs using Swift, XMM-Newton and NuSTAR Observations
Arghajit Jana, Arka Chatterjee, Hsiang-Kuang Chang +6
We studied the broadband X-ray spectra of {\it Swift}/BAT selected low-accreting AGNs using the observations from {\it XMM-Newton}, {\it Swift}, and {\it NuSTAR} in the energy rang…
Correlations between QPO frequencies and spectral parameters of GRS 1915+105 using AstroSat observations
Ruchika Dhaka, Ranjeev Misra, JS Yadav +1
In this work, we study the correlation between Quasi-periodic Oscillation (QPO) frequency and the spectral parameters during various X-ray states in the black hole binary GRS 1915+…
AstroSat view of the neutron star low-mass X-ray binary GX 340+0
Yash Bhargava, Sudip Bhattacharyya, Jeroen Homan +1
Understanding the spectral evolution along the `Z'-shaped track in the hardness-intensity diagram of Z-sources, which are a class of luminous neutron star low-mass X-ray binaries,…
A fast radio burst localized at detection to an edge-on galaxy using very-long-baseline interferometry
Tomas Cassanelli, Calvin Leung, Pranav Sanghavi +48
Fast radio bursts (FRBs) are millisecond-duration, luminous radio transients of extragalactic origin. These events have been used to trace the baryonic structure of the Universe us…
Unified treatment of mean-field dynamo and angular-momentum transport in magnetorotational instability-driven turbulence
Tushar Mondal, Pallavi Bhat
Magnetorotational instability (MRI)-driven turbulence and dynamo phenomena are analyzed using direct statistical simulations. Our approach begins by developing a unified mean-field…
Accelerated binary black holes in globular clusters: forecasts and detectability in the era of space-based gravitational-wave detectors
Avinash Tiwari, Aditya Vijaykumar, Shasvath J. Kapadia +2
The motion of the center of mass of a coalescing binary black hole (BBH) in a gravitational potential imprints a line-of-sight acceleration (LOSA) onto the emitted gravitational wa…
The second data release from the European Pulsar Timing Array II. Customised pulsar noise models for spatially correlated gravitational waves
J. Antoniadis, P. Arumugam, S. Arumugam +95
The nanohertz gravitational wave background (GWB) is expected to be an aggregate signal of an ensemble of gravitational waves emitted predominantly by a large population of coalesc…
Meterwavelength Single-pulse Polarimetric Emission Survey. VI. Towards understanding the Phenomenon of Pulsar Polarization in Partially Screened Vacuum Gap model
Dipanjan Mitra, George I. Melikidze, Rahul Basu
We have observed 123 pulsars with periods longer than 0.1 seconds in the Meterwavelength Single-pulse Polarimetric Emission Survey. In this work a detailed study of polarization be…
High hard X-ray polarization in Cygnus X-1 confined to the intermediate hard state: evidence for a variable jet component
Tanmoy Chattopadhyay, Abhay Kumar, A. R. Rao +7
Cygnus X-1, the well-known accreting black hole system, exhibits several observational features hinting at an intricate interplay between the accretion disk, its atmosphere known a…
Broadband spectro-temporal investigation of neutron star low-mass X-ray binary GX 349+2
Unnati Kashyap, Manoneeta Chakraborty, Sudip Bhattacharyya +1
We report a broadband investigation of the Z-type neutron star (NS) low mass X-ray binary (LMXB) GX 349+2 using AstroSat and NICER. AstroSat observed the source exhibiting large sc…
Disk-corona modeling for spectral index and luminosity correlation of tidal disruption events
T. Mageshwaran, Sudip Bhattacharyya
We present a relativistic disk-corona model for a steady state advective accretion disk to explain the UV to X-ray spectral index evolution of \textbf{four} tidal d…
Refining the 2022 OJ 287 impact flare arrival epoch
Mauri J. Valtonen, Staszek Zola, Gopakumar +24
The bright blazar OJ~287 routinely parades high brightness bremsstrahlung flares, which are explained as being a result of a secondary supermassive black hole (SMBH) impacting the…
Associating fast radio bursts with compact binary mergers via gravitational lensing
Mukesh Kumar Singh, Shasvath J. Kapadia, Soummyadip Basak +2
The origin of fast radio bursts (FRBs) is currently an open question with several proposed sources and corresponding mechanisms for their production. Among them are compact binary…
Flux-resolved Spectropolarimetric Evolution of the X-Ray Pulsar Hercules X-1 Using IXPE
Akash Garg, Divya Rawat, Yash Bhargava +2
We conduct a spectro-polarimetric study of the accreting X-ray pulsar Hercules X-1 using observations with the Imaging X-ray Polarimetry Explorer (IXPE). IXPE monitored the source…
Estimating the evolution of Sparks in Partially Screened Gap of Pulsars from Subpulse Drifting
Rahul Basu, Dipanjan Mitra, George I. Melikidze
A novel scheme has been developed to show that the observed phase behaviour associated with subpulse drifting from two pulsars, J10343224 and J17202933, can be used to obtain…