July 27, 2015 to August 21, 2015
Nordita, Stockholm
Europe/Stockholm timezone

Beaming of particles and synchrotron radiation in relativistic magnetic reconnection at high magnetizations

Aug 14, 2015, 11:10 AM
FD5 (Nordita, Stockholm)


Nordita, Stockholm

Oral Workshop, August 10-14 Pre-noon V


Dr Daniel Kagan (Tel Aviv University)


We investigate the beaming of particles and the resulting synchrotron radiation in relativistic reconnection with background magnetizations of 4, 40, and 400 via 2D particle-in-cell simulations. First, we verify that the overall rate of energy conversion and the characteristics of radiation are similar at all magnetizations even for configurations including low-density background plasmas, despite the differences in reconnection physics for such plasmas found by Bessho and Bhattacharjee (2012). We then find that particles are accelerated to high energies in all simulations, but bulk outflows are only mildly relativistic with Lorentz factors ~ 3 that are insensitive to magnetization, and that the overall particle momentum and synchrotron radiation is not strongly beamed. High-energy particles in reconnection regions are beamed within an opening angle of 1/gamma, where gamma is their Lorentz factor, but the direction of that beaming changes with location from the direction of the electric field to the direction of outflow as one moves from the center of the X-point towards the magnetic island. Because the magnetic field in the center of the reconnection region is low, the high-energy radiation from reconnection is therefore oriented in two wide fans in the plane of the current sheet that are centered approximately in the directions of reconnection outflows.

Primary author

Dr Daniel Kagan (Tel Aviv University)


Prof. Ehud Nakar (Tel Aviv University) Prof. Tsvi Piran (Hebrew University of Jerusalem)

Presentation materials