2006A&A...455L...5G

Query : 2006A&A...455L...5G

2006A&A...455L...5G - Astronomy and Astrophysics, volume 455L5-8 (2006/8-3)

Flares in GRB afterglows from delayed magnetic dissipation.

GIANNIOS D.

Abstract (from CDS):

One of the most intriguing discoveries made by the Swift satellite is the flaring activity in about half of the afterglow lightcurves. Flares have been observed on both long and short duration GRBs and on time scales that range from minutes to ∼1 day after the prompt emission. The rapid evolution of some flares led to the suggestion that they are caused by late central engine activity. Here, I propose an alternative explanation that does not need reviving of the central engine. Flares can be powered by delayed magnetic dissipation in strongly magnetized (i.e. with initial Poynting to kinetic flux ratio >1) ejecta during its deceleration due to interaction with the external medium. A closer look at the length scales of the dissipation regions shows that magnetic dissipation can give rise to fast evolving and energetic flares. Multiple flares are also expected in the context of the model.

Abstract Copyright: ∼

Journal keyword(s): gamma rays: bursts - magnetohydrodynamics (MHD) - instabilities

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 050502B gB 09 30 10.024 +16 59 48.07           ~ 169 0

Query : 2006A&A...455L...5G

Basic data :
GRB 050502B -- Gamma-ray Burst
Other object types: otypes_help 		gB (GRB), UV (2009ApJ)
ICRS coord. (ep=J2000) : 		09 30 10.024 +16 59 48.07 (Ultraviolet) [ 1000 1000 90 ] D 2009ApJ...690..163R
FK4 coord. (ep=B1950 eq=1950) : 		09 27 23.678 +17 12 59.85 [ 1000 1000 90 ]
Gal coord. (ep=J2000) : 		214.355021 +42.590498 [ 1000 1000 90 ]
Radial velocity / Redshift / cz : 		V(km/s) 284590 [~] / z(photometric) 5.2 [~] / cz 1558921 [~]
   E 2015ApJ...807...76L
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Identifiers (1) :
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GRB 050502B

References (169 between 1850 and 2026) (Total 169)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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