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Stability analysis of relativistic jets from collapsars and its implications on the short-term variability of gamma-ray bursts

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Stability analysis of relativistic jets from collapsars and its implications on the short-term variability of gamma-ray bursts

dc.contributor.author	Aloy Toras, Miguel Angel
dc.contributor.author	Ibáñez Cabanell, José María
dc.contributor.author	Miralles Torres, Juan Antonio
dc.contributor.author	Urpin, Vadim
dc.date.accessioned	2010-07-30T11:18:02Z
dc.date.available	2010-07-30T11:18:02Z
dc.date.issued	2002
dc.identifier.citation	ALOY, M.A. ; Ibanez Cabanell, Jose Maria ; Miralles, J.A. ; Urpin, V., 2002, Stability analysis of relativistic jets from collapsars and its implications on the short-term variability of gamma-ray bursts, Astronomy and Astrophysics, vol. 396, no. 2, p. 693-703	en
dc.identifier.uri	http://hdl.handle.net/10550/16756
dc.description.abstract	We consider the transverse structure and stability properties of relativistic jets formed in the course of the collapse of a massive progenitor. Our numerical simulations show the presence of a strong shear in the bulk velocity of such jets. This shear can be responsible for a very rapid shear–driven instability that arises for any velocity profile. This conclusion has been confirmed both by numerical simulations and theoretical analysis. The instability leads to rapid fluctuations of the main hydrodynamical parameters (density, pressure, Lorentz factor, etc.). However, the perturbations of the density are e ectively decoupled from those of the pressure because the beam of the jet is radiation–dominated. The characteristic growth time of instability is much shorter than the life time of the jet and, therefore, may lead to a complete turbulent beam. In the course of the non-linear evolution, these fluctuations may yield to internal shocks which can be randomly distributed in the jet. In the case that internal shocks in a ultrarelativistic outflow are responsible for the observed phenomenology of gamma-ray bursts, the proposed instability can well account for the short-term variability of gamma-ray light curves down to milliseconds.	en
dc.language.iso	en	en
dc.subject	Magnetohydradynamics (MHD) : Gamma rays ; Bursts ; Gamma ray theory ; ISM jets and outflows ; galaxies jets	en
dc.title	Stability analysis of relativistic jets from collapsars and its implications on the short-term variability of gamma-ray bursts	en
dc.type	journal article	es_ES
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA	en
dc.subject.unesco	UNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia	en
dc.identifier.doi	10.1051/0004-6361:20021367	en
dc.identifier.idgrec	011933	en
dc.type.hasVersion	VoR	es_ES
dc.identifier.url	http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/pdf/2002/47/aa2863.pdf	en