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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20110503T000000
DTEND;TZID=Atlantic/Canary:20110503T010000
UID:iactalks-266
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/266
CREATED:2011-05-03T00:00:00+01:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Probing gamma-ray production in relativistic jets of flat spectrum 
 radio quasars
DESCRIPTION:Probing gamma-ray production in relativistic jets of flat spect
 rum radio quasars\nMiss Josefa Becerra\n\nThe MAGIC telescopes discovered 
 very high energy (VHE, E>100 GeV) gamma-ray emission  coming from the d
 istant Flat Spectrum Radio Quasar (FSRQ) PKS 1222+21 (4C +21.35,  z=0.432)
 . It is the second most distant VHE gamma-ray source, with well measured  
 redshift, detected until now. The detection coincides with high energy MeV
 /GeV gamma-ray  activity measured by the Large Area Telescope (LAT) on boa
 rd the Fermi satellite. The VHE  and MeV/GeV spectra, corrected for the ab
 sorption by the extragalactic background light,  can be described by a sin
 gle power law with photon index 2.72 ± 0.34 between 3 GeV and  400 
 GeV, consistent with gamma-ray emission belonging to a single component in
  the jet.  The absence of a spectral cutoff constrains the gamma-ray emiss
 ion region to lie outside  the Broad Line Region, which would otherwise ab
 sorb the VHE gamma-rays. On the other  hand, the MAGIC measurement of a do
 ubling time of about 9 minutes indicates an extremely  compact emission re
 gion, in conflict with the "far dissipation" scenario. This result  challe
 nges jet emission models in FSRQs and indicates the importance of jet  sub
 -structures.
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