The Importance of Off-Axis Beaming in Gamma-Ray Burst Jet Models

Details The Importance of Off-Axis Beaming in Gamma-Ray Burst Jet Models The Importance of Off-Axis Beaming in Gamma-Ray Burst Jet Models

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715103d&link_type=abstract

American Astronomical Society Meeting 207, #151.03; Bulletin of the American Astronomical Society, Vol. 37, p.1410

Astronomy and Astrophysics

Astronomy

Scientific paper

Gamma-Ray Bursts (GRBs) are widely thought to originate from collimated jets of material moving at relativistic velocities. Emission from such a jet should be visible even when viewed from outside the angle of collimation. We summarize current work on the relativistic beaming transformation of the burst quantities Eiso and Epeak as a function of viewing angle. These formulae serve as input for our Monte Carlo population synthesis method, with which we investigate the importance of off-axis beaming in the context of several variable opening-angle uniform jet models. Such models should produce large populations of observable off-axis bursts that lie away from the Epeak Eiso1/2 relation, but are not seen in current datasets. We investigate the effect of the bulk γ value upon this off-axis population, as well as the effect of including an Ω jet-Eγ correlation to jointly fit the Epeak Eiso1/2 and Epeak Eγ β relations. We find that an inverse correlation between Γ and Ω jet has the effect of greatly reducing the visibility of off-axis events. We also find that the X-Ray Flashes (XRFs) seen by HETE-2 and BeppoSAX cannot be easily explained as classical GRBs viewed off-axis.

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