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VERSION:2.0
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METHOD:PUBLISH
BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110301T000000
DTEND;TZID=Atlantic/Canary:20110301T010000
UID:iactalks-248
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/248
CREATED:2011-03-01T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:MAGIC observations and multiwavelength properties of the quasar 3C 
 279 in 2007 and 2009
DESCRIPTION:MAGIC observations and multiwavelength properties of the quasar
  3C 279 in 2007 and 2009\nDr. Karsten Berger\n\n3C 279, the first quasar d
 iscovered to emit VHE gamma-rays by the MAGIC telescope in 2006, was re-ob
 served by MAGIC in January 2007 during a major optical flare and from Dece
 mber 2008 to April 2009 following an alert from the Fermi space telescope 
 on an exceptionally high gamma -ray state. The January 2007 observations r
 esulted in a detection on January 16 with significance 5.2 sigma, correspo
 nding to a F(> 150 GeV)(3.8±0.8) 10^-11 ph cm-2 s-1 while the ov
 erall data sample does not show significant signal. The December 2008 - Ap
 ril 2009 observations did not detect the source. We study the multi-wavele
 ngth behaviour of the source at the epochs of MAGIC observations, collecti
 ng quasi-simultaneous data at optical and X-ray frequencies and for 2009 a
 lso gamma-ray data from Fermi. We study the light curves and spectral ener
 gy distribution of the source. The spectral energy distributions of three 
 observing epochs (including the February 2006, which has been previously p
 ublished in Albert et al. 2008a) are modelled with one-zone inverse Compto
 n models and the emission on January 16, 2007 also with two zone model and
  with a lepto-hadronic model. We find that the VHE gamma-ray emission dete
 cted in 2006 and 2007 challenges standard one-zone model, based on relativ
 istic electrons in a jet scattering broad line region photons, while the o
 ther studied models fit the observed spectral energy distribution more sat
 isfactorily.
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