154 citations · 800 across the 31 of their papers we have counts for
29 papers · 1 filter
First Detection of Radio Polarization During Jet Formation in the Changing-Look AGN 1ES 1927+654
Onic I. Shuvo, Eileen T. Meyer, Sibasish Laha +10
We present a multiwavelength radio study of the changing-look AGN 1ES 1927+654 following its renewed X-ray brightening since mid-2022, combining VLBA imaging with multi-band and ti…
A fast radio burst cyclone in technicolour: evidence of plasma lensing
Pavan A. Uttarkar, Ryan M. Shannon, Kelly Gourdji +9
Fast radio bursts (FRBs) are bright, energetic, radio pulses of extragalactic origin. A dichotomy has emerged in the population: some produce repeat bursts, while the majority do n…
The Advanced X-ray Imaging Satellite (AXIS) Community Science Book
Michael Koss, Nafisa Aftab, Steven W. Allen +395
The AXIS Community Science Book represents the collective effort of 592 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (A…
The Role of Electric Dominance for Particle Injection in Relativistic Reconnection
Sanya Gupta, Navin Sridhar, Lorenzo Sironi
Magnetic reconnection in relativistic plasmas -- where the magnetization -- is regarded as an efficient particle accelerator, capable of explaining the most dramatic astrop…
Bulk Motions in the Black Hole Jet Sheath as a Candidate for the Comptonizing Corona
Navin Sridhar, Bart Ripperda, Lorenzo Sironi +2
Using two-dimensional general relativistic resistive magnetohydrodynamic simulations, we investigate the properties of the sheath separating the black hole jet from the surrounding…
The origin of the coherent radio flash potentially associated with GRB 201006A
Nikhil Sarin, Teagan A. Clarke, Spencer J. Magnall +4
Rowlinson et al. 2023 recently claimed the detection of a coherent radio flash 76.6 minutes after a short gamma-ray burst. They proposed that the radio emission may be associated w…
Prospects for Time-Domain and Multi-Messenger Science with AXIS
The AXIS Time-Domain, Multi-Messenger Science Working Group, : +19
The Advanced X-ray Imaging Satellite (AXIS) promises revolutionary science in the X-ray and multi-messenger time domain. AXIS will leverage excellent spatial resolution (<1.5 arcse…
The High Energy X-ray Probe (HEX-P): Probing Accretion onto Stellar Mass Black Holes
Riley Connors, John Tomsick, Paul Draghis +20
Accretion is a universal astrophysical process that plays a key role in cosmic history, from the epoch of reionization to galaxy and stellar formation and evolution. Accreting stel…
The High Energy X-ray Probe (HEX-P): Probing the physics of the X-ray corona in active galactic nuclei
E. Kammoun, A. M. Lohfink, M. Masterson +28
The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission…
Comptonization by Reconnection Plasmoids in Black Hole Coronae III: Dependence on the Guide Field in Pair Plasma
Sanya Gupta, Navin Sridhar, Lorenzo Sironi
We perform two-dimensional particle-in-cell simulations of magnetic reconnection for various strengths of the guide field (perpendicular to the reversing field), in magnetically-do…
Constraints on the persistent radio source associated with FRB 20190520B using the European VLBI Network
Shivani Bhandari, Benito Marcote, Navin Sridhar +7
We present very-long-baseline interferometry (VLBI) observations of a continuum radio source potentially associated with the fast radio burst source FRB 20190520B. Using the Europe…
Mapping Obscured Star Formation in the Host Galaxy of FRB 20201124A
Yuxin Dong, Tarraneh Eftekhari, Wen-fai Fong +23
We present high-resolution 1.5 6 GHz Karl G. Jansky Very Large Array (VLA) and Hubble Space Telescope (HST) optical and infrared observations of the extremely active repeating…
An X-ray Census of Fast Radio Burst Host Galaxies: Constraints on AGN and X-ray Counterparts
T. Eftekhari, W. Fong, A. C. Gordon +16
We present the first X-ray census of fast radio burst (FRB) host galaxies to conduct the deepest search for AGN and X-ray counterparts to date. Our sample includes seven well-local…
High-Energy Neutrinos from Gamma-Ray-Faint Accretion-Powered Hypernebulae
Navin Sridhar, Brian D. Metzger, Ke Fang
Hypernebulae are inflated by accretion-powered winds accompanying hyper-Eddington mass transfer from an evolved post-main sequence star onto a black hole or neutron star companion.…
A non-repeating fast radio burst in a dwarf host galaxy
Shivani Bhandari, Alexa C. Gordon, Danica R. Scott +14
We present the discovery of as-of-yet non-repeating Fast Radio Burst (FRB), FRB 20210117A, with the Australian Square Kilometer Array Pathfinder (ASKAP) as a part of the Commensal…
Radio Nebulæ from Hyper-Accreting X-ray Binaries as Common Envelope Precursors and Persistent Counterparts of Fast Radio Bursts
Navin Sridhar, Brian D. Metzger
Roche lobe overflow from a donor star onto a black hole or neutron star binary companion can evolve to a phase of unstable runaway mass-transfer, lasting as short as hundreds of or…
Comptonization by Reconnection Plasmoids in Black Hole Coronae II: Electron-Ion Plasma
Navin Sridhar, Lorenzo Sironi, Andrei M. Beloborodov
We perform two-dimensional particle-in-cell simulations of magnetic reconnection in electron-ion plasmas subject to strong Compton cooling and calculate the X-ray spectra produced…
A Toy Model for the Time-Frequency Structure of Fast Radio Bursts: Implications for the CHIME Burst Dichotomy
Brian D. Metzger, Navin Sridhar, Ben Margalit +2
We introduce a toy model for the time-frequency structure of fast radio bursts (FRB), in which the observed emission is produced as a narrowly-peaked intrinsic spectral energy dist…
Comptonization by Reconnection Plasmoids in Black Hole Coronae I: Magnetically Dominated Pair Plasma
Navin Sridhar, Lorenzo Sironi, Andrei M. Beloborodov
We perform two-dimensional particle-in-cell simulations of reconnection in magnetically dominated electron-positron plasmas subject to strong Compton cooling. We vary the magnetiza…
Periodic Fast Radio Bursts from Luminous X-ray Binaries
Navin Sridhar, Brian D. Metzger, Paz Beniamini +4
The discovery of periodicity in the arrival times of the fast radio bursts (FRBs) poses a challenge to the oft-studied magnetar scenarios. However, models that postulate that FRBs…
Reflection Modeling of the Black Hole Binary 4U~163047: the Disk Density and Returning Radiation
Riley Connors, Javier García, John Tomsick +11
We present the analysis of X-ray observations of the black hole binary 4U~163047 using relativistic reflection spectroscopy. We use archival data from the RXTE, Swift, and NuSTA…
Shock-powered radio precursors of neutron star mergers from accelerating relativistic binary winds
Navin Sridhar, Jonathan Zrake, Brian D. Metzger +2
During the final stages of a compact object merger, if at least one of the binary components is a magnetized neutron star (NS), then its orbital motion substantially expands the NS…
Implications of a "Fast Radio Burst" from a Galactic Magnetar
Ben Margalit, Paz Beniamini, Navin Sridhar +1
A luminous radio burst was recently detected in temporal coincidence with a hard X-ray flare from the Galactic magnetar SGR 1935+2154 with a time and frequency structure consistent…
Evidence for Returning Disk Radiation in the Black Hole X-ray Binary XTE J1550-564
Riley M. T. Connors, Javier A. Garcia, Thomas Dauser +7
We explore the accretion properties of the black hole X-ray binary \j1550\ during its outbursts in 1998/99 and 2000. We model the disk, corona, and reflection components of X-ray s…