Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Alexander Philippov"'
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 2, p 140 (2024)
NICER has observed a few millisecond pulsars where the geometry of the X-ray-emitting hotspots on the neutron star have been analyzed in order to constrain the mass and radius from X-ray light-curve modeling. One example, PSR J0030 + 0451, has been s
Externí odkaz:
https://doaj.org/article/8ce8334f093142bd82aee22a7b309830
Publikováno v:
The Astrophysical Journal, Vol 957, Iss 2, p 103 (2023)
Low-collisionality plasma in a magnetic field generically develops anisotropy in its distribution function with respect to the magnetic field direction. Motivated by the application to radiation from accretion flows and jets, we explore the effect of
Externí odkaz:
https://doaj.org/article/95610c1d119642c0b6fed7e1f33448d3
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 122 (2023)
We present the results of 3D particle-in-cell simulations that explore relativistic magnetic reconnection in pair plasma with strong synchrotron cooling and a small mass fraction of nonradiating ions. Our results demonstrate that the structure of the
Externí odkaz:
https://doaj.org/article/2a7b551a622d4e60a7afa2085ad9f383
Publikováno v:
The Astrophysical Journal, Vol 943, Iss 2, p 105 (2023)
Some of the most energetic pulsars exhibit rotation-modulated γ -ray emission in the 0.1–100 GeV band. The luminosity of this emission is typically 0.1%–10% of the pulsar spin-down power ( γ -ray efficiency), implying that a significant fractio
Externí odkaz:
https://doaj.org/article/d504ca513a81435abe9ab7c585b2410d
Autor:
Alisa Galishnikova, Alexander Philippov, Eliot Quataert, Fabio Bacchini, Kyle Parfrey, Bart Ripperda
Publikováno v:
Physical Review Letters. 130
We study the accretion of collisionless plasma onto a rotating black hole from first principles using axisymmetric general-relativistic particle-in-cell simulations. We carry out a side-by-side comparison of these results to analogous general-relativ
Some of the most energetic pulsars exhibit rotation-modulated gamma-ray emission in the $0.1$ to $100$ GeV band. The luminosity of this emission is typically $0.1\text{-}10\%$ of the pulsar spin-down power (gamma-ray efficiency), implying that a sign
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a1cbc3133e1306d0ce74a53ec146ce09
http://arxiv.org/abs/2209.02121
http://arxiv.org/abs/2209.02121
Electromagnetic fireworks: Fast radio bursts from rapid reconnection in the compressed magnetar wind
One scenario for the generation of fast radio bursts (FRBs) is magnetic reconnection in a current sheet of the magnetar wind. Compressed by a strong magnetic pulse induced by a magnetar flare, the current sheet fragments into a self-similar chain of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b56ef5cc55d26a4a876f25d902a7c68b
http://arxiv.org/abs/2203.04320
http://arxiv.org/abs/2203.04320
Autor:
Amir Levinson, Ehud Nakar, Arno Vanthieghem, Jens Florian Mahlmann, Alexander Philippov, Frederico Fiuza
The radiation drag in photon-rich environments of cosmic explosions can seed kinetic instabilities by inducing velocity spreads between relativistically streaming plasma components. Such microturbulence is likely imprinted on the breakout signals of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::225bd8e68d0d14f05007171ce082d1ce
Publikováno v:
Astrophysical Journal Letters, 896, 2, pp. 1-7
Astrophysical Journal Letters, 896, 1-7
Astrophysical Journal Letters, 896, 1-7
Magnetized jets in GRBs and AGNs are thought to be efficient accelerators of particles, however, the process responsible for the acceleration is still a matter of active debate. In this work, we study the kink-instability in non-rotating force-free j
Autor:
Alexander Philippov, J. F. Mahlmann, Yajie Yuan, A. Chernoglazov, Bart Ripperda, Amitava Bhattacharjee, J. M. TenBarge, James Juno, Elias R. Most
Publikováno v:
Journal of Plasma Physics. 87
Alfvén waves as excited in black hole accretion disks and neutron star magnetospheres are the building blocks of turbulence in relativistic, magnetized plasmas. A large reservoir of magnetic energy is available in these systems, such that the plasma