[Alumnes] HOY: 14:00hs - Seminario FCAG - Dra. Anabella Araudo

[Secretaría de Ciencia y Técnica]

Estimados,

Les recordamos que en el día de hoy, a las 14:00 hs. en el Salón 
Meridiano, tendremos un seminario a cargo de la Dra. Anabella Araudo 
(Institute of Physics, Academy of Sciences, Czech Republic)*, el cual 
**se  titula "Acceleration of UHECRs in AGN jets******". El**resumen del 
mismo lo pueden leer al final de este mensaje.*

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**Les recordamos, además, que los objetivos de estos seminarios son el 
de generar un espacio ameno y activo de intercambio de ideas, para 
exponer nuestros trabajos y temas de investigación, o bien el de 
aquellos que circunstancialmente nos visitan en nuestra casa de altos 
estudios. Teniendo en cuenta que nuestra institución nuclea una gran 
diversidad de temas de investigación, y distintos estamentos académicos, 
este espacio resulta de vital importancia para conocernos, acercarnos y 
hasta generar posibles colaboraciones. **

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**Quedan todos cordialmente invitados y los esperamos 15 minuto**s antes 
con café y galletitas.

**Atentamente,

Secyt-FCAG

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*Seminario:Dra. Anabella Araudo -Institute of Physics, Academy of 
Sciences, Czech Republic.****

Título:Acceleration of UHECRs in AGN jets


Resumen:One of the most exciting and unsolved problems in Astrophysics 
is figuring out the origin of the Ultra High Energy Cosmic Rays 
(UHECRs). These are protons and heavy ions having an energy larger than 
1 EeV arriving on Earth from outside our Galaxy, but their origin 
remains unknown. Relativistic jets in Active 10 Galactic Nuclei (AGN) 
are candidates to be the sources where these particles are accelerated. 
Diffusive shock acceleration is the most established mechanism to 
accelerate particles in sources where strong shocks are present, such as 
AGN jets. However, recent theoretical advances combined with 
multi-frequency observational data indicate that relativistic shocks in 
AGN jets are unable to accelerate particles to energies much larger than 
a PeV. The implication of this result is that if UHECRs are accelerated 
by shocks, then those shocks are probably not relativistic, and 
therefore mildly relativistic shocks in the backflow of giant-lobed 
radio galaxies such as Centaurus A and Fornax A are very promising 
candidates to accelerate UHECRs. In this talk I will present the state 
of the art of UHECR acceleration by shocks in AGN. I will focus on 
particle acceleration and magnetic field amplification in termination 
shocks and in the backflows in AGN jets.

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