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SUMMARY:MAGIC observations of the February 2014 flare of 1ES 1011+496 appl
 ied to the measurement of the Extragalactic Background Light density
DTSTART;VALUE=DATE-TIME:20151026T075500Z
DTEND;VALUE=DATE-TIME:20151026T081300Z
DTSTAMP;VALUE=DATE-TIME:20260412T065536Z
UID:indico-contribution-950@indico.icrr.u-tokyo.ac.jp
DESCRIPTION:Speakers: Abelardo Moralejo Olaizola (Institut de Físca d'Alt
 es Energies\, Barcelona)\n1ES 1011+496 is a blazar located at a redshift z
 =0.212\, revealed as a very-high-energy gamma-ray emitter by the MAGIC tel
 escopes in 2007. In February 2014 the source underwent an unprecedented fl
 aring episode\, reaching a peak flux of almost 14 times the flux measured 
 at the time of discovery\, before returning to its low state. The MAGIC te
 lescopes observed the source for a total of 17 nights between February 6 a
 nd March 7\, during which the source displayed a remarkably stable spectra
 l shape (estimated intrinsic photon index around 2) and significant flux v
 ariations in timescales of 1 day. The average spectrum during the flare co
 uld be well measured up to a few TeV\, which makes this an ideal observati
 on for probing the Extragalactic Background Light (EBL) through its effect
  on the gamma-ray flux. A maximum likelihood method was applied for the si
 multaneous estimation of the source intrinsic spectral parameters and of t
 he optical depth due to the EBL\, using the EBL model by Domínguez et al 
 (2011) as a template to account for the EBL spectrum and evolution. The re
 sulting measurement of the EBL density is among the most constraining ones
  obtained with gamma-ray telescopes on a single source\, and is compatible
  with current EBL models\, strengthening the case for no significant contr
 ibution of unresolved sources to the EBL.\n\nhttps://indico.icrr.u-tokyo.a
 c.jp/event/23/contributions/950/
LOCATION: Room 5.6
URL:https://indico.icrr.u-tokyo.ac.jp/event/23/contributions/950/
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