High Power Laser Science and Engineering, 2019, 7 (1): 01000e17, Published Online: Apr. 4, 2019  

Maser radiation from collisionless shocks: application to astrophysical jets Download: 655次

Author Affiliations
1 Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 0NG, UK
2 Department of Physics, West Virginia University, Morgantown, WV 26506-6315, USA
3 School of Mathematics and Statistics, University of St. Andrews, Fife, KY16 9SS, UK
4 Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
5 GoLP/Instituto de Plasmas e Fusãu Nuclear, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisbon, Portugal
6 STFC Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, UK
7 Laboratoire pour l’Utilisation de Lasers Intenses, UMR7605, CNRS CEA, Université Paris VI Ecole Polytechnique, 91128 Palaiseau Cedex, France
8 Department of Physics, University of Oxford, Parks Road, Oxford, OX1 3PU, UK
9 Departments of Planetary Sciences and Astronomy, University of Arizona, Tucson, AZ 85721, USA
10 AWE, Aldermaston, Reading, West Berkshire, RG7 4PR, UK
11 Department of Physics, National Central University, Taoyuan 320, China
12 Institute of Laser Engineering, Osaka University, 2-6 Yamadaoka, Suita, Osaka 565-0871, Japan
13 School of Mathematics and Physics, Queen’s University Belfast, Belfast, BT7 1NN, UK
14 Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637, USA
15 Imperial College London, London, SW72AZ, UK
Abstract
This paper describes a model of electron energization and cyclotron-maser emission applicable to astrophysical magnetized collisionless shocks. It is motivated by the work of Begelman, Ergun and Rees [Astrophys. J. 625, 51 (2005)] who argued that the cyclotron-maser instability occurs in localized magnetized collisionless shocks such as those expected in blazar jets. We report on recent research carried out to investigate electron acceleration at collisionless shocks and maser radiation associated with the accelerated electrons. We describe how electrons accelerated by lower-hybrid waves at collisionless shocks generate cyclotron-maser radiation when the accelerated electrons move into regions of stronger magnetic fields. The electrons are accelerated along the magnetic field and magnetically compressed leading to the formation of an electron velocity distribution having a horseshoe shape due to conservation of the electron magnetic moment. Under certain conditions the horseshoe electron velocity distribution function is unstable to the cyclotron-maser instability [Bingham and Cairns, Phys. Plasmas 7, 3089 (2000); Melrose, Rev. Mod. Plasma Phys. 1, 5 (2017)].

D. C. Speirs, K. Ronald, A. D. R. Phelps, M. E. Koepke, R. A. Cairns, A. Rigby, F. Cruz, R. M. G. M. Trines, R. Bamford, B. J. Kellett, B. Albertazzi, J. E. Cross, F. Fraschetti, P. Graham, P. M. Kozlowski, Y. Kuramitsu, F. Miniati, T. Morita, M. Oliver, B. Reville, Y. Sakawa, S. Sarkar, C. Spindloe, M. Koenig, L. O. Silva, D. Q. Lamb, P. Tzeferacos, S. Lebedev, G. Gregori, R. Bingham. Maser radiation from collisionless shocks: application to astrophysical jets[J]. High Power Laser Science and Engineering, 2019, 7(1): 01000e17.

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