Remnants from Gamma-Ray Bursts
Abstract
We model the intermediate time evolution of a "jetted" gamma-ray burst by two blobs of matter colliding with the interstellar medium. We follow the hydrodynamical evolution of this system numerically and calculate the bremsstrahlung and synchrotron images of the remnant. We find that for a burst energy of 1051 erg the remnant becomes spherical after 5000 years when it collects 50M of interstellar mass. This result is independent of the exact details of the GRB, such as the opening angle. After this time a gamma-ray burst remnant has an expanding sphere morphology. The similarity to a supernova remnant makes it difficult distinguish between the two at this stage. The expected number of non-spherical gamma-ray burst remnants is 0.05 per galaxy for a beaming factor of 0.01 and a burst energy of 1051 erg. Our results suggest that that the double-shell object DEM L 316 is not a GRB remnant.
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