258 citations · 1k across the 25 of their papers we have counts for
25 papers
Radio polarization of millisecond pulsars with multipolar magnetic fields
Ankan Sur, Yajie Yuan, Alexander Philippov
NICER has observed a few millisecond pulsars where the geometry of the X-ray emitting hotspots on the neutron star is analyzed in order to constrain the mass and radius from X-ray…
Evaluation of several explanations of the strong X-ray polarization of the black hole X-ray binary 4U 1630-47
Henric Krawczynski, Yajie Yuan, Alexander Y. Chen +6
The Imaging X-ray Polarimetry Explorer (IXPE) observations of the X-ray binary 4U 1630-47 in the high soft state revealed high linear polarization degrees (PDs) rising from 6% at 2…
Propagation of a Strong Fast Magnetosonic Wave in the Magnetosphere of a Neutron Star
Alexander Y. Chen, Yajie Yuan, Xinyu Li +1
We study the propagation of a strong, low frequency, linearly polarized fast magnetosonic wave inside the magnetosphere of a neutron star. The relative strength of the wave…
Magnetar bursts due to Alfvén wave nonlinear breakout
Yajie Yuan, Andrei M. Beloborodov, Alexander Y. Chen +3
The most common form of magnetar activity is short X-ray bursts, with durations from milliseconds to seconds, and luminosities ranging from to $10^{43}\ {\rm erg}\,{\rm s…
Relativistic Alfvén Waves Entering Charge Starvation in the Magnetospheres of Neutron Stars
Alexander Y. Chen, Yajie Yuan, Andrei M. Beloborodov +1
Instabilities in a neutron star can generate Alfvén waves in its magnetosphere. Propagation along the curved magnetic field lines strongly shears the wave, boosting its electric cu…
Alfvén wave mode conversion in pulsar magnetospheres
Yajie Yuan, Yuri Levin, Ashley Bransgrove +1
The radio emission anomaly coincident with the 2016 glitch of the Vela pulsar may be caused by a star quake that launches Alfvén waves into the magnetosphere, disturbing the origin…
Plasmoid ejection by Alfvén waves and the fast radio bursts from SGR 1935+2154
Yajie Yuan, Andrei M. Beloborodov, Alexander Y. Chen +1
Using numerical simulations we show that low-amplitude Alfvén waves from a magnetar quake propagate to the outer magnetosphere and convert to "plasmoids" (closed magnetic loops) wh…
A Numerical Model for the Multi-wavelength Lightcurves of PSR J0030+0451
Alexander Y. Chen, Yajie Yuan, Georgios Vasilopoulos
Recent modeling of Neutron Star Interior Composition Explorer(NICER) observations of the millisecond pulsar PSR J0030+0451 suggests that the magnetic field of the pulsar is non-dip…
Inverse Compton Cascades in Pair-Producing Gaps: Effects of Triplet Pair Production
Maria Petropoulou, Yajie Yuan, Alexander Y. Chen +1
Inverse Compton-pair cascades are initiated when gamma-rays are absorbed on an ambient soft photon field to produce relativistic pairs, which in turn up-scatter the same soft photo…
Black hole magnetosphere with small scale flux tubes--II. Stability and dynamics
Yajie Yuan, Anatoly Spitkovsky, Roger D. Blandford +1
In some Seyfert Galaxies, the hard X-rays that produce fluorescent emission lines are thought to be generated in a hot corona that is compact and located at only a few gravitationa…
Black hole magnetosphere with small scale flux tubes
Yajie Yuan, Roger D. Blandford, Dan R. Wilkins
There is observational evidence that the X-ray continuum source that creates the broad fluorescent emission lines in some Seyfert Galaxies may be compact and located at a few gravi…
Kinetic simulations of relativistic magnetic reconnection with synchrotron and inverse Compton cooling
Krzysztof Nalewajko, Yajie Yuan, Martyna Chruślińska
First results are presented from kinetic numerical simulations of relativistic collisionless magnetic reconnection in pair plasma that include radiation reaction from both synchrot…
Physics of Pair Producing Gaps in Black Hole Magnetospheres
Alexander Y. Chen, Yajie Yuan, Huan Yang
In some low-luminosity accreting supermassive black hole systems, the supply of plasma in the funnel region can be a problem. It is believed that a local region with unscreened ele…
Magnetoluminescence
Roger Blandford, Yajie Yuan, Masahiro Hoshino +1
Pulsar Wind Nebulae, Blazars, Gamma Ray Bursts and Magnetars all contain regions where the electromagnetic energy density greatly exceeds the plasma energy density. These sources e…
Modelling Jets, Tori and Flares in Pulsar Wind Nebulae
Oliver Porth, Rolf Buehler, Barbara Olmi +5
In this contribution we review the recent progress in the modeling of Pulsar Wind Nebulae (PWN). We start with a brief overview of the relevant physical processes in the magnetosph…
Minute-Timescale >100 MeV gamma-ray variability during the giant outburst of quasar 3C 279 observed by Fermi-LAT in 2015 June
LAT Collaboration
On 2015 June 16, Fermi-LAT observed a giant outburst from the flat spectrum radio quasar 3C 279 with a peak MeV flux of $\sim3.6\times10^{-5}\;{\rm photons}\;{\rm cm}^{-2}\;…
Kinetic study of radiation-reaction-limited particle acceleration during the relaxation of unstable force-free equilibria
Yajie Yuan, Krzysztof Nalewajko, Jonathan Zrake +2
Many powerful and variable gamma-ray sources, including pulsar wind nebulae, active galactic nuclei and gamma-ray bursts, seem capable of accelerating particles to gamma-ray emitti…
Kinetic simulations of the lowest-order unstable mode of relativistic magnetostatic equilibria
Krzysztof Nalewajko, Jonathan Zrake, Yajie Yuan +2
We present the results of particle-in-cell numerical pair plasma simulations of relativistic 2D magnetostatic equilibria known as the 'ABC' fields. In particular, we focus on the l…
Active Galactic Nuclei: The TeV Challenge
R. Blandford, W. East, K. Nalewajko +2
Jets associated with Active Galactic Nuclei (AGN) have been observed for almost a century, initially at optical and radio wavelengths. They are now widely accepted as "exhausts" pr…
On the Implications of Recent Observations of the Inner Knot in the Crab Nebula
Yajie Yuan, Roger Blandford
Recent observations of the Crab Nebula (Rudy et al 2015) have maintained its reputation for high energy astrophysical enlightenment and its use as a testbed for theories of the beh…
Characterization of the Inner Knot of the Crab: The Site of the Gamma-ray Flares?
A. Rudy, D. Horns, A. DeLuca +18
One of the most intriguing results from the gamma-ray instruments in orbit has been the detection of powerful flares from the Crab Nebula. These flares challenge our understanding…
Spontaneous decay of periodic magnetostatic equilibria
William E. East, Jonathan Zrake, Yajie Yuan +1
In order to understand the conditions which lead a highly magnetized, relativistic plasma to become unstable, and in such cases how the plasma evolves, we study a prototypical clas…
Cosmic Ray Origins: An Introduction
Roger Blandford, Paul Simeon, Yajie Yuan
Physicists have pondered the origin of cosmic rays for over a hundred years. However the last few years have seen an upsurge in the observation, progress in the theory and a genuin…
Fermi-LAT Detection of a Break in the Gamma-Ray Spectrum of the Supernova Remnant Cassiopeia A
Y. Yuan, S. Funk, G. Jóhannesson +3
We report on observations of the supernova remnant Cassiopeia A in the energy range from 100 MeV to 100 GeV using 44 months of observations from the Large Area Telescope on board t…