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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20211019T103000
DTEND;TZID=Atlantic/Canary:20211019T113000
UID:iactalks-1510
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1510
CREATED:2021-10-19T10:30:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Galaxy evolution and cosmology using gamma rays observed with Fermi
 -LAT
DESCRIPTION:Galaxy evolution and cosmology using gamma rays observed with F
 ermi-LAT\nDr. Alberto Dominguez\n\nThe light emitted by all galaxies acros
 s the history of the Universe is encoded in the intensity of the extragala
 ctic background light (EBL), the diffuse cosmic radiation field at ultravi
 olet, optical, and infrared wavelengths. The EBL is a source of opacity fo
 r very high energy gamma rays via pair production, leaving a characteristi
 c attenuation imprint in the spectra of distant gamma-ray sources. In this
  seminar, I will report on new measurements of the EBL using gamma-ray dat
 a from both the Large Area Telescope on board the Fermi Gamma-ray Space Te
 lescope and ground-based Imaging Atmospheric Cherenkov Telescopes. These u
 nprecedented measurements have allowed us to derive the cosmic star-format
 ion history, the number density of faint galaxies during the re-ionization
  epoch, and also the expansion rate of the Universe and its matter content
 . These results demonstrate that gamma-ray astrophysics has matured to the
  point of providing competitive measurements of cosmic properties previous
 ly restricted to techniques used by more traditional astronomy.
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