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A synthesis of the present knowledge on gamma-ray emission from the magnetosphere of a rapidly rotating neutron star is presented, focusing on the electrodynamics of particle accelerators. The combined curvature, synchrotron, and…

Astrophysics · Physics 2009-11-11 Kouichi Hirotani

We study the synchrotron emission of neutrino pairs by relativistic, degenerate electrons in strong magnetic fields. Particular attention is paid to the case in which the dominant contribution comes from one or several lowest cyclotron…

Astrophysics · Physics 2007-05-23 V. G. Bezchastnov , P. Haensel , A. D. Kaminker , D. G. Yakovlev

Synchrotron polarization of relativistic nonthermal electrons in gamma-ray bursts (GRBs) has been widely studied. However, recent numerical simulations of relativistic shocks and magnetic reconnection have found that a more realistic…

High Energy Astrophysical Phenomena · Physics 2024-10-02 Kangfa Cheng , Jirong Mao , Xiaohong Zhao , Hongbang Liu , Merlin Kole , Nicolas Produit , Zhifu Chen

A two-dimensional electrodynamic model is used to study particle acceleration and non-thermal emission mechanisms in the pulsar magnetospheres. We solve distribution of the accelerating electric field with the emission process and the…

Astrophysics · Physics 2009-11-13 J. Takata , H. -K. Chang , S. Shibata

We investigate thermal synchrotron radiation at semi-relativistic and relativistic temperatures. We find an analytic expression for the angle-averaged emission coefficient, and show that it is significantly more accurate that those derived…

Astrophysics · Physics 2009-10-31 Grzegorz Wardzinski , Andrzej A. Zdziarski

We present a model for generation mechanisms of the optical pulsations recently detected from the Geminga pulsar. We argue that this is just a synchrotron radiation emitted along open magnetic field lines at altitudes of a few light…

Astrophysics · Physics 2009-10-31 Janusz Gil , David Khechinashvili , George Melikidze

We use the outer gap model to explain the spectrum and the energy dependent light curves of the X-ray and soft gamma-ray radiations of the spin-down powered pulsar PSR B1509-58. In the outer gap model, most pairs inside the gap are created…

High Energy Astrophysical Phenomena · Physics 2015-06-12 Y. Wang , J. Takata , K. S. Cheng

At laser intensities above 1023W/cm2 the interaction of a laser with a plasma is qualitatively different to the interactions at lower intensities. In this intensity regime solid targets start to become relativistically underdense, gamma-ray…

Plasma Physics · Physics 2015-06-18 C. S. Brady , C. P. Ridgers , T. D. Arber , A. R. Bell

The detected high-energy pulsars' population is growing in number, and thus, having agile and physically relevant codes to analyze it consistently is important. Here, we update our existing synchro-curvature radiation model by including a…

High Energy Astrophysical Phenomena · Physics 2022-09-21 Daniel Íñiguez-Pascual , Daniele Viganò , Diego F. Torres

Magnetic reconnection is ubiquitous in astrophysical systems, and in many such systems, the plasma suffers from significant cooling due to synchrotron radiation. We study relativistic magnetic reconnection in the presence of strong…

High Energy Astrophysical Phenomena · Physics 2023-03-01 Alexander Y. Chen , Dmitri Uzdensky , Jason Dexter

We study the synchrotron radiation emitted by a charged fermion, rotating as a part of a larger system, in a constant magnetic field $B$ parallel to the axis of rotation. The rotation is classical and independent of the magnetic field. The…

High Energy Physics - Phenomenology · Physics 2023-06-21 Matteo Buzzegoli , Jonathan D. Kroth , Kirill Tuchin , Nandagopal Vijayakumar

Synchrotron emission from astrophysical nonthermal sources usually assumes that the emitting particles are isotropic. By means of large-scale two- and three-dimensional particle-in-cell simulations, we demonstrate that the dissipation of…

High Energy Astrophysical Phenomena · Physics 2020-06-04 Luca Comisso , Emanuele Sobacchi , Lorenzo Sironi

In a dense gas plasma a short laser pulse propagates in relativistic self-trapping mode, which enables effective conversion of laser energy to the accelerated electrons. This regime sustains effective loading which maximizes the total…

Plasma Physics · Physics 2021-12-15 M. G. Lobok , I. A. Andriyash , O. E. Vais , V. Malka , V. Yu. Bychenkov

The time evolution of high-energy synchrotron radiation generated in a relativistic pair plasma energized by reconnection of strong magnetic fields is investigated with two- and three-dimensional (2D and 3D) particle-in-cell (PIC)…

High Energy Astrophysical Phenomena · Physics 2023-06-07 K. M. Schoeffler , T. Grismayer , D. Uzdensky , L. O. Silva

We present the results of 3D particle-in-cell (PIC) simulations that explore relativistic magnetic reconnection in pair plasma with strong synchrotron cooling and a small mass fraction of non-radiating ions. Our results demonstrate that the…

High Energy Astrophysical Phenomena · Physics 2023-10-03 Alexander Chernoglazov , Hayk Hakobyan , Alexander A. Philippov

Spontaneous and stimulated emission of an electron in the ion channel is studied. The emission processes are studied in the regime of high harmonic generation when the parameter of plasma wiggler strength is large. Like for conventional…

Optics · Physics 2007-05-23 I. Kostyukov , A. Pukhov

The radiation of a pulsar wind is computed assuming that at roughly 10 to 100 light cylinder radii from the star, magnetic energy is dissipated into particle energy. The synchrotron emission of heated particles appears periodic, with, in…

Astrophysics · Physics 2009-11-07 J. G. Kirk , O. Skjaeraasen , Y. A. Gallant

We demonstrated for the first time the production of highly polarized short-pulse positrons with a finite energy spread in accordance with a new scheme that consists of two-quantum processes, such as inverse Compton scatterings and…

High Energy Physics - Experiment · Physics 2009-11-11 T. Omori , M. Fukuda , T. Hirose , Y. Kurihara , R. Kuroda , M. Nomura , A. Ohashi , T. Okugi , K. Sakaue , T. Saito , J. Urakawa , M. Washio , I. Yamazaki

We present a model for the gamma-ray emission of pulsars in terms of curvature radiation by highly relativistic particles. It is shown that the injection of power-law primary particles from an outer gap and subsequent cooling by curvature…

Astrophysics · Physics 2007-05-23 A. R. Crusius-Waetzel , H. Lesch

The power spectrum formula of the synchrotron radiation generated by the electron and positron moving along the concentric circles at the opposite angular velocities in homogenous magnetic field is derived in the Schwinger version of…

High Energy Physics - Phenomenology · Physics 2007-05-23 Miroslav Pardy