[SEMINARI] The role of time-dependent injection in blazar flares

[Enric Marco]

Title: The role of time-dependent injection in blazar flares

Speaker: Michael Zacharias

From: Landessternwarte Konigstuhl, Heidelberg, Alemanya

Where: Seminari del departament d'Astronomia i Astrofisica

Date: Dijous 18 setembre 2014, 15:00 h.

Abstract

Rapid flaring events in blazars on timescales of a few minutes challenge 
the standard particle evolution scenarios of jets. Most new theories 
that can model the fast flares, depend on the underlying assumption of a 
continuous injection of particles. In this talk I will present 
analytical calculations on a time-dependent injection scenario. Since 
the electrons cannot reach equilibrium for non-continuous injection, the 
feedback with the radiative processes causes non-linear effects inducing 
a much quicker cooling of the electrons. The results are manifold: The 
total spectral energy distributions (SEDs) exhibit unique breaks, which 
would otherwise be modeled with a complicated electron distribution. 
Fractional SEDs, which are not integrated over the entire flare, 
indicate the need for the knowledge of the observation time relative to 
the onset of the flare. Otherwise, parameters and conclusions drawn from 
modeling might be wrong. The lightcurves show reduced variability 
timescales implying less extreme parameters as in other models. Lastly, 
I will briefly comment on the internal photon-photon absorption. It 
turns out that photon-photon absorption should not be a problem for the 
model.

http://celeste.uv.es/daa/seminari.php.UTF8?id=1088

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Dr. Enric Marco
Departament d'Astronomia i Astrofísica
Facultat de Física
Universitat de València
C/  Dr. Moliner, 50
46100 Burjassot, Spain
Phone: (34)-96-354-3069
Fax:(34)-96-354-3084
enric.marco en uv.es
www.uv.es/marco
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