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http://hdl.handle.net/20.500.12386/25228
Campo DC | Valore | Lingua |
---|---|---|
dc.contributor.author | Beniamini, Paz | en_US |
dc.contributor.author | Nava, Lara | en_US |
dc.contributor.author | Piran, Tsvi | en_US |
dc.date.accessioned | 2020-05-27T13:08:09Z | - |
dc.date.available | 2020-05-27T13:08:09Z | - |
dc.date.issued | 2016 | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.uri | http://hdl.handle.net/20.500.12386/25228 | - |
dc.description.abstract | The prompt gamma-ray bursts' (GRBs) efficiency is an important clue on the emission mechanism producing the γ-rays. Previous estimates of the kinetic energy of the blast waves, based on the X-ray afterglow luminosity L<SUB>X</SUB>, suggested that this efficiency is large, with values above 90 per cent in some cases. This poses a problem to emission mechanisms and in particular to the internal shocks model. These estimates are based, however, on the assumption that the X-ray emitting electrons are fast cooling and that their Inverse Compton (IC) losses are negligible. The observed correlations between L<SUB>X</SUB> (and hence the blast wave energy) and E<SUB>γ, iso</SUB>, the isotropic equivalent energy in the prompt emission, has been considered as observational evidence supporting this analysis. It is reasonable that the prompt gamma-ray energy and the blast wave kinetic energy are correlated and the observed correlation corroborates, therefore, the notion L<SUB>X</SUB> is indeed a valid proxy for the latter. Recent findings suggest that the magnetic field in the afterglow shocks is significantly weaker than was earlier thought and its equipartition fraction, ∊<SUB>B</SUB>, could be as low as 10<SUP>-4</SUP> or even lower. Motivated by these findings we reconsider the problem, taking now IC cooling into account. We find that the observed L<SUB>X</SUB> - E<SUB>γ, iso</SUB> correlation is recovered also when IC losses are significant. For small ∊<SUB>B</SUB> values the blast wave must be more energetic and we find that the corresponding prompt efficiency is significantly smaller than previously thought. For example, for ∊<SUB>B</SUB> ∼ 10<SUP>-4</SUP> we infer a typical prompt efficiency of ∼15 per cent. | en_US |
dc.language.iso | eng | en_US |
dc.title | A revised analysis of gamma-ray bursts' prompt efficiencies | en_US |
dc.type | Article | - |
dc.identifier.doi | 10.1093/mnras/stw1331 | en_US |
dc.identifier.scopus | 2-s2.0-84988841646 | en_US |
dc.identifier.isi | 000383272500005 | en_US |
dc.identifier.url | https://academic.oup.com/mnras/article/461/1/51/2595292 | en_US |
dc.relation.medium | STAMPA | en_US |
dc.relation.volume | 461 | en_US |
dc.relation.issue | 1 | en_US |
dc.relation.firstpage | 51 | en_US |
dc.type.referee | REF_1 | en_US |
dc.description.numberofauthors | 3 | en_US |
dc.description.international | sì | en_US |
dc.contributor.country | ISR | en_US |
dc.relation.scientificsector | FIS/05 - ASTRONOMIA E ASTROFISICA | en_US |
dc.relation.journal | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | en_US |
dc.type.miur | 262 Articolo in rivista | - |
dc.identifier.adsbibcode | 2016MNRAS.461...51B | en_US |
dc.relation.fund | FP7 | en_US |
dc.relation.ercsector | ERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation | en_US |
dc.description.apc | no | en_US |
dc.description.oa | 1 – prodotto con file in versione Open Access (allegare il file al passo 5-Carica) | en_US |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.openairetype | Article | - |
item.languageiso639-1 | en | - |
item.cerifentitytype | Publications | - |
item.grantfulltext | open | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | O.A. Brera | - |
crisitem.author.orcid | 0000-0001-5960-0455 | - |
crisitem.journal.journalissn | 0035-8711 | - |
crisitem.journal.ance | E112946 | - |
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