Do fireballs in the interstellar medium necessarily imply blast wave propagation?

Details Do fireballs in the interstellar medium necessarily imply blast wave propagation? Do fireballs in the interstellar medium necessarily imply blast wave propagation?

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...313l...9m&link_type=abstract

Astronomy and Astrophysics, v.313, p.L9-L12

Astronomy and Astrophysics

Astrophysics

7

Gamma Rays: Bursts, Cosmic Rays: Propagation, Shocks: Collisionless

Scientific paper

The current version of cosmic fireball (FB) models for understanding the mechanism of Gamma Ray Bursts (GRBs), expounded by Meszaros, Rees and their coworkers (MRC), envisage that the initial leptonic fire-ball energy is converted into bulk kinetic energy of the polluting baryons and which decelerate by interacting with the interstellar medium (ISM) and form a forward shock. From elementary, yet hitherto overlooked, considerations we show that the relativistic baryons (protons) are unlikely to see the standard ISM as a fluid and interact efficiently with it on the acceptable GRB time scales (0.1-100s). If we invoke the known value of the ISM spatial diffusion coefficient in the present problem, we need to assume the existence of very strong magnetic field (~104G) at the BF-ISM interface to alleviate this foregoing problem. Alternatively, we must assume that there is indeed strong magnetic turbulence near the interface and the scattering lengh is directly determined by the much shorter value of the gyro-radii of the protons. Simultaneously, we need to assume that substantial fraction of the FB energy is converted into magnetic field and remains frozen into the BF to a yield a value of the magnetic field ~0.1G near the expected deceleration radius (r_d_~10^15^-10^16^cm). Still it turns out to be far from clear how the BF-ISM interaction can indeed be seen as a collision between two fluids and occuring on a time scale shorter than the expected GRB time scales.

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