Short Grbs From Compact Object Collisions In Gcs

Details Short Grbs From Compact Object Collisions In Gcs Short Grbs From Compact Object Collisions In Gcs

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0504r&link_type=abstract

American Astronomical Society, HEAD meeting #10, #5.04

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose a theoretical investigation of a new mechanism by which short gamma-ray burst (SGRB) production can be achieved. In this new paradigm, it is supposed that the compact objects are contained within a globular cluster (GC), and that close encounters rather than pure gravitational wave emission drives them together. Although event rates within galaxies are found to be much too low to be of interest, such encounters may be frequent enough in GCs to have an important effect on the production of SGRBs. Precise modeling of the dynamics allows for a detailed description of the encounter, and preliminary calculations show that there is in principle no problem in accounting for the global energy budget of a typical SGRB. The particulars of each collision, however, are variable in several aspects, and can lead to interesting diversity. First and most importantly, the nature of the encounter is highly dependent on the impact parameter. This is in contrast to the merger scenario, in which the masses of the compact objects dictate the characteristic length and luminosity scale for SGRB activity. Second, the nature of the compact star itself can produce very different outcomes. Third, the presence of tidal tails in which material will fall back onto the central object at a later time is a generic feature of the present set of calculations. The mass involved in these structures is considerably larger than for binary mergers. It is thus possible, in principle, to account genericaly in this scenario for a prompt episode of energy release as well as for activity many dynamical time scales later. Finally, due to the large star density in the star cluster core, there is the possibility for the interaction of the external shock with a denser external medium than that of the IGM.

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