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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20161117T103000
DTEND;TZID=Atlantic/Canary:20161117T113000
UID:iactalks-965
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/965
CREATED:2016-11-17T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Very High Energy emission at the Cosmic Gamma Ray Horizon: a MAGIC 
 discovery happened thanks to gravitational lensing 
DESCRIPTION:Very High Energy emission at the Cosmic Gamma Ray Horizon: a MA
 GIC discovery happened thanks to gravitational lensing \nDr. Marina Mangan
 aro\n\nThe Major Atmospheric Gamma-ray Imaging Cherenkov (MAGIC) telescope
 s reported the discovery of the most distant gamma-ray source ever observe
 d at very high energies, thanks to the “replay” of an enormous
  flare by a galactic gravitational lens as foreseen by Einstein’s Ge
 neral Relativity. QSO B0218+357 is a gravitationally lensed blazar located
  at a  redshift of 0.944. The gravitational lensing splits the emitted  ra
 diation into two components separated by a 10–12 day delay. In July 
 2014,  QSO B0218+357 experienced a violent flare observed by the Fermi-LAT
  and followed by the MAGIC telescopes. The spectral energy distribution of
  QSO B0218+357 can give information on the energetics of z ~ 1 very high e
 nergy gamma-ray sources. Moreover the gamma-ray emission can  also be used
  as a probe of the extragalactic background light at z ~ 1. MAGIC performe
 d observations of QSO B0218+357  during the expected arrival time of the d
 elayed component of the  emission. The MAGIC and Fermi-LAT observations we
 re accompanied by quasi-simultaneous optical data from the KVA telescope a
 nd X-ray observations by Swift-XRT.  We construct a multiwavelength spectr
 al energy distribution of QSO  B0218+357 and use it to model the source. T
 he GeV and sub-TeV data  obtained by Fermi-LAT and MAGIC are used to set c
 onstraints on the extragalactic background light. Very high energy gamma-r
 ay emission was  detected from the direction of QSO B0218+357 by the MAGIC
  telescopes  during the expected time of arrival of the trailing component
  of the  flare, making it the farthest very high energy gamma-ray source d
 etected  to date. The combined MAGIC and Fermi-LAT spectral energy  distri
 bution of QSO B0218+357 is consistent with current extragalactic  backgrou
 nd light models. The broadband emission can be modeled in the  framework o
 f a two-zone external Compton scenario, where the GeV  emission comes from
  an emission region in the jet, located outside the  broad line region.\nW
 ork published in A&A 595, A98 (2016) ( http://www.aanda.org/articles/a
 a/abs/2016/11/aa29461-16/aa29461-16.html)\nhttps://magic.mpp.mpg.de/outsid
 ers/results/magic-highlights-5/\nhttp://www.iac.es/divulgacion.php?op1=16&
 amp;id=1133
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