2017/10/01 by Maxim Lyutikov, Lyutikov, Maxim
Engineering · Physics and Astronomy · #Atomic and Molecular Physics #Laser-induced spectroscopy and plasma #Solar and Space Plasma Dynamics #astro-ph.HE
paper · pdf · doi:10.48550/arxiv.1710.00373
arxiv created 2017/10/01 · arxiv updated 2017/10/03
We consider structure and emission properties of a pair plasma fireball that cools due to radiation. At temperatures T ≥ 0.5 me c2 the cooling takes a form of clearly defined cooling wave, whereby the temperature and pair density experience a sharp drop within a narrow region. The surface temperature, corresponding to the location where the optical depth to infinity reaches unity, never falls much below 0.1 me c2 ≈ 50 keV. The propagation velocity of the cooling wave is much smaller than the speed of light and decreases with increasing bulk temperature.