[Todos] Fwd: Charla Martes 18/4 11:15 hs Arrival directions of the high-energy cosmic rays

[Asistentes de Secretaria de Fisica]

-------- Mensaje original -------- 

 		ASUNTO:
 		Charla Martes 18/4 11:15 hs Arrival directions of the high-energy
cosmic rays

 		FECHA:
 		2017-04-17 19:55

 		REMITENTE:
 		Matías Tueros <mjtueros at gmail.com>

 		DESTINATARIO:
 		Secretaria del Dpto.de Física <secre2 at fisica.unlp.edu.ar>

Hola Cecilia.

Podrías enviar esto a todos? Muchas Gracias!

Estimados colegas  
Mañana visita nuestro grupo el Ugo Gregorio Giacarri de la Universidad
Federal de Rio de Janeiro,y dará una charla repasando los estudios sobre
la distribución de las direcciones de arribo de los rayos cósmicos de
ultra alta energía luego de 10 años de operación del Observatorio Auger.
Siendo una charla en carácter de review, puede ser interesante para
cualquiera que quiera estar al tanto del estado del arte en el tema. Los
esperamos!  

Martes 18/4 11:15hs Aula Ex-Gamboa
Ugo Gregorio Giaccari (Rio de Janeiro Federal U. & Pierre Auger Observ.)

 Arrival directions of the high-energy cosmic rays  

after 10 years of operation of the Pierre Auger Observatory Since the
first detection of a cosmic ray particle with energy in excess of 1020
eV by J. Linsley at the Volcano Ranch in 1963, the origin of these
particles, the most energetic produced in nature, is an enduring problem
in Astro-Particle Physics. While the energy spectrum and the chemical
composition measurements provide constraints helping in inferring
properties of the acceleration processes, the identification of the
sources can only be achieved by capturing in the arrival directions a
pattern suggestive in an evident way of a class of astrophysical
objects. This remains however a difficult task, mostly because of the
very small value of the cosmic rays intensity at Earth at high energy
(of the order ∼ 3 × 10-1 km-2 sr-1 yr-1 above 1018 eV). To collect an
increased in flux of events, a jump in cumulated exposure as well as
improved instrumentation have been achieved in the past decade. The
Pierre Auger Observatory, located near the town of Malarg¨ue (Argentina)
and covering an area of ∼ 3000 km2 , is allowing since 2004 a scrutiny
of the ultra high energy cosmic ray sky (except in the northern most
quarter) with a total exposure of ∼ 7.6 × 104 km2 sr yr. The Pierre
Auger Observatory allows an unprecedented sensitivity in searching for
anisotropies in the arrival direction distribution over the celestial
sphere. The object of this talk is to review the different searches
performed after 10 years of operations of the Observatory.
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