Afterglows with High Inferred Values of ɛe and Vegr B: A Clue to the Gamma-Ray Burst Environment?

Details Afterglows with High Inferred Values of ɛe and Vegr B: A Clue to the Gamma-Ray Burst Environment? Afterglows with High Inferred Values of ɛe and Vegr B: A Clue to the Gamma-Ray Burst Environment?

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..662..327k&link_type=abstract

GAMMA-RAY BURST AND AFTERGLOW ASTRONOMY 2001: A Workshop Celebrating the First Year of the HETE Mission. AIP Conference Proceed

Astronomy and Astrophysics

Astronomy

Gamma-Ray Sources, Gamma-Ray Bursts

Scientific paper

Spectral modeling of GRB afterglows using synchrotron-radiation theory has implied high values for the fraction of the internal energy residing in relativistic electrons and positrons (Vegr e>~0.1), and in at least some cases also for the magnetic-to-internal energy ratio (Vegr B ~ 0.01 - 0.1). These results are difficult to understand under the usual assumption that the afterglow-emitting shock propagates into a standard interstellar-medium or stellar-wind environment. We suggest that the high values of Vegr e and Vegr B can be naturally explained if the shock propagates, instead, into a pulsar-wind bubble. One possible scenario in which such an environment is produced is provided by the supranova model of GRB formation, wherein a supernova explosion leaves a rapidly rotating neutron star that emits intense pulsar-type radiation over a period of months to years before collapsing into a black hole and triggering the GRB. Guided by recent results on plerions, we construct a simple model of the bubble structure and show that it can reproduce the source parameter values inferred from the spectral fits.

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