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26 April 2024 |
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Compton Echoes from Gamma-Ray Bursts: Unveiling Misaligned Jets in Nearby Type Ib/c Supernovae | | Enrico Ramirez-Ruiz
; Piero Madau
; | | Date: |
6 May 2004 | | Journal: | Astrophys.J. 608 (2004) L89-L92 | | Subject: | astro-ph | | Affiliation: | IAS), Piero Madau (UCSC | | Abstract: | There is now compelling evidence of a link between long-duration gamma-ray bursts (GRBs) and Type Ib/c supernovae (SNe). These core-collapse explosions are conjectured to radiate an anisotropic, beamed component associated with a decelerating, relativistic outflow and an unbeamed, isotropic component associated with the slowly expanding stellar debris. The anisotropic emission remains at a very low level until the Doppler cone of the beam intersects the observer’s line of sight, making off-axis GRB jets directly detectable only at long wavelengths and late times. Circumstellar material, however, will Compton scatter the prompt gamma-ray and afterglow radiation flux and give rise to a reflection echo. We show that the Compton echo of a misaligned GRB carries an X-ray luminosity that may exceed by many orders of magnitude that produced by the underlying subrelativistic SN during the first few weeks. Bright scattering echoes may therefore provide a means for detecting a population of misaligned GRBs associated with nearby Type Ib/c SNe and yield crucial information on the environment surrounding a massive star at the time of its death. The question of whether the interpretation of GRB980425 as an ordinary GRB observed off-axis is consistent with the lack of an X-ray echo is addressed, along with the constraints derived on the possible existence of misaligned GRB jets in SN1993J, SN1994I, SN1999em, and SN2002ap. | | Source: | arXiv, astro-ph/0405123 | | Services: | Forum | Review | PDF | Favorites | |
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