The Fermi Blazar-zone Divide

Details The Fermi Blazar-zone Divide The Fermi Blazar-zone Divide

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3315c&link_type=abstract

American Astronomical Society, HEAD meeting #11, #33.15; Bulletin of the American Astronomical Society, Vol. 41, p.708

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The location of the region responsible for the SED peaks and the gamma-ray emission in blazars (so-called "Blazar zone") is still uncertain. Some scenarios put it inside the Broad Line region, so to produce gamma-rays through Comptonization of UV photons, while others locate it at larger distances, where Comptonization of dust IR photons dominate. BLR photons however are expected to imprint an absorption feature in the gamma-ray spectra above 10 GeV (due to gamma-gamma absorption), and the different distances could yield different variability properties. Fermi-LAT has now detected several FSRQ above 10 GeV, allowing us to discriminate between the different scenarios on a source-by-source basis.

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