On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission
Both induced Compton scattering and induced Raman scattering strongly limit the observability of the extremely bright (>10 21 K), prompt coherent radio emission recently predicted to emanate from gamma-ray bursts (GRBs). Induced Compton scattering is the main limiting factor when the region aroun...
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| Format: | Journal Article |
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The American Astronomical Society
2007
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| Online Access: | http://hdl.handle.net/20.500.11937/4957 |
| _version_ | 1848744660318552064 |
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| author | Macquart, Jean-pierre |
| author_facet | Macquart, Jean-pierre |
| author_sort | Macquart, Jean-pierre |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Both induced Compton scattering and induced Raman scattering strongly limit the observability of the extremely bright (>10 21 K), prompt coherent radio emission recently predicted to emanate from gamma-ray bursts (GRBs). Induced Compton scattering is the main limiting factor when the region around the progenitor is not dense but when one still considers the scattering effect of a tenuous circumburst ISM. For a medium of density 0.01n 0.01 cm-3 and a path length Lkpc and emission that is roughly isotropic in its rest frame, the brightness temperature is limited, where 100 100 is the Lorentz factor of the frame in which the emission occurs. Thus, for a burst at distance D the predicted emission is only visible if the jet is ultrarelativistic, with 3 , or if the intrinsic opening angle of the emission is G 10 (D/100 Mpc) extremely small. Thus, the presence or absence of such radio emission provides an excellent constraint on the Lorentz factor of the GRB outflow during the very early stages of its outburst. Induced Raman scattering imposes an even more stringent limit independent of the emission opening angle, but only effective if GRB emission must propagate through a dense progenitor wind within ~10 15 cm from the blast center. |
| first_indexed | 2025-11-14T06:05:00Z |
| format | Journal Article |
| id | curtin-20.500.11937-4957 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T06:05:00Z |
| publishDate | 2007 |
| publisher | The American Astronomical Society |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-49572017-09-13T16:04:15Z On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission Macquart, Jean-pierre plasmas gamma rays waves radiation mechanisms scattering bursts nonthermal Both induced Compton scattering and induced Raman scattering strongly limit the observability of the extremely bright (>10 21 K), prompt coherent radio emission recently predicted to emanate from gamma-ray bursts (GRBs). Induced Compton scattering is the main limiting factor when the region around the progenitor is not dense but when one still considers the scattering effect of a tenuous circumburst ISM. For a medium of density 0.01n 0.01 cm-3 and a path length Lkpc and emission that is roughly isotropic in its rest frame, the brightness temperature is limited, where 100 100 is the Lorentz factor of the frame in which the emission occurs. Thus, for a burst at distance D the predicted emission is only visible if the jet is ultrarelativistic, with 3 , or if the intrinsic opening angle of the emission is G 10 (D/100 Mpc) extremely small. Thus, the presence or absence of such radio emission provides an excellent constraint on the Lorentz factor of the GRB outflow during the very early stages of its outburst. Induced Raman scattering imposes an even more stringent limit independent of the emission opening angle, but only effective if GRB emission must propagate through a dense progenitor wind within ~10 15 cm from the blast center. 2007 Journal Article http://hdl.handle.net/20.500.11937/4957 10.1086/513424 The American Astronomical Society unknown |
| spellingShingle | plasmas gamma rays waves radiation mechanisms scattering bursts nonthermal Macquart, Jean-pierre On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title | On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title_full | On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title_fullStr | On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title_full_unstemmed | On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title_short | On the Detectability of Prompt Coherent Gamma-Ray Burst Radio Emission |
| title_sort | on the detectability of prompt coherent gamma-ray burst radio emission |
| topic | plasmas gamma rays waves radiation mechanisms scattering bursts nonthermal |
| url | http://hdl.handle.net/20.500.11937/4957 |