FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2883172924> ?p ?o ?g. }

• W2883172924 abstract "Many models of gamma-ray bursts (GRBs) involve a expanding at extreme relativistic speeds. The of material expands in a photon-quiet phase for a period t0 and then becomes gamma-ray active, perhaps due to inhomogeneities in the interstellar medium or the generation of shocks. Based on kinematics, we relate the envelope of the emission of the event to the characteristics of the photon-quiet and photon-active phases. We initially assume local spherical wherein, on average, the same conditions prevail over the shell's surface within angles the order of Γ–1, where Γ is the Lorentz factor for the bulk motion. The contribution of the curvature to the temporal structure is comparable to the contribution from the overall expansion. As a result, GRB time histories from a should have an envelope similar to (fast rise, exponential decay) events in which the rise time is related to the duration of the photon-active phase and the fall time is related to the duration of the photon-quiet phase. This result depends only on local spherical and, since most GRBs do not have such envelopes, we introduce the shell symmetry problem: the observed time history envelopes of most GRBs do not agree with that expected for a relativistic expanding shell.Although FREDs have the signature of a relativistic shell, they may not be due to a single shell, as required by some cosmological models. Some FREDs have precursors in which the peaks are separated by more than the expansion time required to explain FRED shape. Such a burst is most likely explained by a engine; that is, the separation of the multiple peaks occurs because the site produced multiple releases of energy on timescales comparable to the duration of the event. Alternatively, there still could be local spherical of the bulk material, but with a low factor; that is, only a few percent of the viewable surface (which is already very small, 4πΓ–2) ever becomes gamma-ray active.Long complex bursts present a myriad of problems for the models. The duration of the event at the detector is ~t0/(2Γ2). The long duration cannot be due to large t0, since it requires too much energy to sweep up the interstellar medium. Nor can it be due to small Σ if the time variation is due to ambient objects, since the density of such objects is unreasonable (~1018Γ–4 pc–3 for typical parameters). Long events must explain why they almost always violate local spherical or why they have low filling factors.Both precursor and long complex events are likely to be central engines that produce multiple releases of energy over ~100 s. One promising alternative scenario is one in which the becomes thicker than the radius of the curvature within Γ–1. Then it acts as a parallel slab, eliminating the problems associated with local spherical symmetry." @default.
• W2883172924 created "2018-08-03" @default.
• W2883172924 creator A5005033676 @default.
• W2883172924 creator A5006001103 @default.
• W2883172924 creator A5039117039 @default.
• W2883172924 date "1996-12-20" @default.
• W2883172924 modified "2023-09-26" @default.
• W2883172924 title "Expanding relativistic shells and gamma-ray burst temporal structure" @default.
• W2883172924 doi "https://doi.org/10.1086/178210/meta" @default.
• W2883172924 hasPublicationYear "1996" @default.
• W2883172924 type Work @default.
• W2883172924 sameAs 2883172924 @default.
• W2883172924 citedByCount "0" @default.
• W2883172924 crossrefType "journal-article" @default.
• W2883172924 hasAuthorship W2883172924A5005033676 @default.
• W2883172924 hasAuthorship W2883172924A5006001103 @default.
• W2883172924 hasAuthorship W2883172924A5039117039 @default.
• W2883172924 hasConcept C121332964 @default.
• W2883172924 hasConcept C124369789 @default.
• W2883172924 hasConcept C147120987 @default.
• W2883172924 hasConcept C159317903 @default.
• W2883172924 hasConcept C159985019 @default.
• W2883172924 hasConcept C163862864 @default.
• W2883172924 hasConcept C168997771 @default.
• W2883172924 hasConcept C17599544 @default.
• W2883172924 hasConcept C185544564 @default.
• W2883172924 hasConcept C192562407 @default.
• W2883172924 hasConcept C195065555 @default.
• W2883172924 hasConcept C2524010 @default.
• W2883172924 hasConcept C2781052500 @default.
• W2883172924 hasConcept C33923547 @default.
• W2883172924 hasConcept C41008148 @default.
• W2883172924 hasConcept C44280652 @default.
• W2883172924 hasConcept C44870925 @default.
• W2883172924 hasConcept C554190296 @default.
• W2883172924 hasConcept C5667645 @default.
• W2883172924 hasConcept C62520636 @default.
• W2883172924 hasConcept C65155139 @default.
• W2883172924 hasConcept C74650414 @default.
• W2883172924 hasConcept C76155785 @default.
• W2883172924 hasConceptScore W2883172924C121332964 @default.
• W2883172924 hasConceptScore W2883172924C124369789 @default.
• W2883172924 hasConceptScore W2883172924C147120987 @default.
• W2883172924 hasConceptScore W2883172924C159317903 @default.
• W2883172924 hasConceptScore W2883172924C159985019 @default.
• W2883172924 hasConceptScore W2883172924C163862864 @default.
• W2883172924 hasConceptScore W2883172924C168997771 @default.
• W2883172924 hasConceptScore W2883172924C17599544 @default.
• W2883172924 hasConceptScore W2883172924C185544564 @default.
• W2883172924 hasConceptScore W2883172924C192562407 @default.
• W2883172924 hasConceptScore W2883172924C195065555 @default.
• W2883172924 hasConceptScore W2883172924C2524010 @default.
• W2883172924 hasConceptScore W2883172924C2781052500 @default.
• W2883172924 hasConceptScore W2883172924C33923547 @default.
• W2883172924 hasConceptScore W2883172924C41008148 @default.
• W2883172924 hasConceptScore W2883172924C44280652 @default.
• W2883172924 hasConceptScore W2883172924C44870925 @default.
• W2883172924 hasConceptScore W2883172924C554190296 @default.
• W2883172924 hasConceptScore W2883172924C5667645 @default.
• W2883172924 hasConceptScore W2883172924C62520636 @default.
• W2883172924 hasConceptScore W2883172924C65155139 @default.
• W2883172924 hasConceptScore W2883172924C74650414 @default.
• W2883172924 hasConceptScore W2883172924C76155785 @default.
• W2883172924 hasLocation W28831729241 @default.
• W2883172924 hasOpenAccess W2883172924 @default.
• W2883172924 hasPrimaryLocation W28831729241 @default.
• W2883172924 hasRelatedWork W1630926709 @default.
• W2883172924 hasRelatedWork W1814477494 @default.
• W2883172924 hasRelatedWork W1947915464 @default.
• W2883172924 hasRelatedWork W1977926405 @default.
• W2883172924 hasRelatedWork W1979526511 @default.
• W2883172924 hasRelatedWork W2090771094 @default.
• W2883172924 hasRelatedWork W2092944198 @default.
• W2883172924 hasRelatedWork W2157652759 @default.
• W2883172924 hasRelatedWork W2417783802 @default.
• W2883172924 hasRelatedWork W2613173515 @default.
• W2883172924 hasRelatedWork W2951092745 @default.
• W2883172924 hasRelatedWork W2993972271 @default.
• W2883172924 hasRelatedWork W3001091609 @default.
• W2883172924 hasRelatedWork W3099747440 @default.
• W2883172924 hasRelatedWork W3102377846 @default.
• W2883172924 hasRelatedWork W3104948335 @default.
• W2883172924 hasRelatedWork W3106252589 @default.
• W2883172924 hasRelatedWork W3168426876 @default.
• W2883172924 hasRelatedWork W1664525444 @default.
• W2883172924 hasRelatedWork W1892674276 @default.
• W2883172924 isParatext "false" @default.
• W2883172924 isRetracted "false" @default.
• W2883172924 magId "2883172924" @default.
• W2883172924 workType "article" @default.