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Jets in Gamma-Ray Bursts
Open accessAbstract
In the afterglows of several gamma-ray bursts (GRBs), rapid temporal decay, which is inconsistent with spherical (isotropic) blast-wave models, is observed. In particular, GRB 980519 had the most rapidly fading of the well-documented GRB afterglows, with t -2.05±0.04 in optical as well as in X-rays. We show that such temporal decay is more consistent with the evolution of a jet after it slows down and spreads laterally, for which t - p decay is expected (where p is the index of the electron energy distribution). Such a beaming model would relax the energy requirements on some of the more extreme GRBs by a factor of several hundred. It is likely that a large fraction of the weak- (or no-) afterglow observations are also due to the common occurrence of beaming in GRBs and that their jets have already transitioned to the spreading phase before the first afterglow observations were made. With this interpretation, a universal value of p ≅ 2.4 is consistent with all data.
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Citations
Cites
Fluid dynamics of relativistic blast waves
Blandford, R. D., & McKee, C. F. (1976) · The Physics of Fluids · doi:10.1063/1.861619 · Cited by 1,215
Cited by
Zhang, B., Fan, Y. Z., Dyks, J., Kobayashi, S., Meszaros, P., Burrows, D. N., Nousek, J. A., & Gehrels, N. (2006) · The Astrophysical Journal · doi:10.1086/500723 · Cited by 1,079
The Dynamics and Light Curves of Beamed Gamma‐Ray Burst Afterglows
Rhoads, J. E. (1999) · The Astrophysical Journal · doi:10.1086/307907 · Cited by 787
GAMMA-RAY BURSTS: PROGRESS, PROBLEMS & PROSPECTS
ZHANG, B., & MÉSZÁROS, P. (2004) · International Journal of Modern Physics A · doi:10.1142/s0217751x0401746x · Cited by 783
Fong, W., Berger, E., Margutti, R., & Zauderer, B. A. (2015) · The Astrophysical Journal · doi:10.1088/0004-637x/815/2/102 · Cited by 532
Broadband observations of the naked-eye γ-ray burst GRB 080319B
Racusin, J. L., Karpov, S. V., Sokolowski, M., Granot, J., Wu, X. F., Pal’shin, V., Covino, S., van der Horst, A. J., Oates, S. R., Schady, P., et al. (2008) · Nature · doi:10.1038/nature07270 · Cited by 526
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Metadata
- Authors
- Sari, R., Piran, T., & Halpern, J. P.
- Venue
- The Astrophysical Journal
- Publisher
- American Astronomical Society
- Published
- 1999-07-01
- Volume
- 519
- Issue
- 1
- Pages
- L17-L20
- ISSN
- 0004-637X (ISSN-L)
- OpenAlex
- W1987204710
- Cited by
- 1,053
- References
- 1
- FWCI
- 38.89
- Type
- journal article
- Language
- en
- Open access
- bronze
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- Sari, R., Piran, T., & Halpern, J. P. (1999). Jets in Gamma-Ray Bursts. The Astrophysical Journal. https://doi.org/10.1086/312109
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
