On the pairelectromagnetic pulse from an electromagnetic black hole surrounded by a baryonic remnant
Abstract
The interaction of an expanding PairElectromagnetic pulse (PEM pulse) with a shell of baryonic matter surrounding a Black Hole with electromagnetic structure (EMBH) is analyzed for selected values of the baryonic mass at selected distances well outside the dyadosphere of an EMBH. The dyadosphere, the region in which a super critical field exists for the creation of e^{+}e^{} pairs, is here considered in the special case of a ReissnerNordstrom geometry. The interaction of the PEM pulse with the baryonic matter is described using a simplified model of a slab of constant thickness in the laboratory frame (constantthickness approximation) as well as performing the integration of the general relativistic hydrodynamical equations. Te validation of the constantthickness approximation, already presented in a previous paper Ruffini et al. (1999) for a PEM pulse in vacuum, is here generalized to the presence of baryonic matter. It is found that for a baryonic shell of massenergy less than 1% of the total energy of the dyadosphere, the constantthickness approximation is in excellent agreement with full general relativistic computations. The approximation breaks down for larger values of the baryonic shell mass, however such cases are of less interest for observed Gamma Ray Bursts (GRBs). On the basis of numerical computations of the slab model for PEM pulses, we describe (i) the properties of relativistic evolution of a PEM pulse colliding with a baryonic shell; (ii) the details of the expected emission energy and observed temperature of the associated GRBs for a given value of the EMBH mass; 10^{3}M_sun, and for baryonic massenergies in the range 10^{8} to 10^{2} the total energy of the dyadosphere.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 July 2000
 arXiv:
 arXiv:astroph/0004257
 Bibcode:
 2000A&A...359..855R
 Keywords:

 BLACK HOLE PHYSICS;
 GAMMA RAYS: THEORY;
 GAMMA RAYS: BURSTS;
 GAMMA RAYS: OBSERVATIONS;
 Astrophysics
 EPrint:
 11 pages, 15 figures, to appear in Astronomy and Astrophysics