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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110428T000000
DTEND;TZID=Atlantic/Canary:20110428T010000
UID:iactalks-260
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/260
CREATED:2011-04-28T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Extragalactic background light and its implications for galaxy evol
 ution and gamma-ray astronomy
DESCRIPTION:Extragalactic background light and its implications for galaxy 
 evolution and gamma-ray astronomy\nDr. Alberto Dominguez Diaz\n\nThe extra
 galactic background light (EBL) is of fundamental importance both for unde
 rstanding the entire process of galaxy evolution and for gamma-ray astrono
 my, but the overall spectrum of the EBL between 0.1 and 1000 microns has n
 ever been determined directly from galaxy spectral energy distribution (SE
 D) observations over a wide redshift range. Galaxy SED-type fractions from
  z=0.2-1 are estimated from a multi-wavelength sample from the AEGIS colla
 boration that allows a new determination of the evolving EBL. Then, the tr
 ansparency of the Universe to very high energy (VHE) gamma-ray photons is 
 derived. We find the maximum transparency of the Universe allowed by the s
 tandard framework. This result challenges current VHE observations of high
  redshift blazars. A solution to this problem is discussed utilizing VHE s
 pectra of the highest redshift blazars assuming the existence of a plausib
 le dark matter candidate known as axion-like particle.
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