Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3306p&link_type=abstract
American Astronomical Society, HEAD meeting #11, #33.06; Bulletin of the American Astronomical Society, Vol. 41, p.706
Astronomy and Astrophysics
Astronomy
Scientific paper
Despite High Peak BL Lacs (HBL) being observed for tens of years, the existing experimental data set is not sufficient to unambigously identify the physical mechanisms responsible for the electromagnetic emission. The Fermi-LAT instrument, which started operation in August 2008, provides "continuous" source coverage with high sensitivity in the band 0.1-100 GeV, which is rather unexplored for HBLs. In particular, the simultaneous observations of HBLs with Fermi-LAT and Imaging Cherenkov Telescopes (IACTs) have the unprecented capability of resolving the complete high energy bump without gaps, which is a very valuable information to refine (or rule out) the currently available theoretical emission models. In the conference I will report on the long term Fermi view of two classical TeV HBL sources: Markarian 421 and Markarian 501. In addition, I will also show results from the multi-frequency (radio to TeV) observations performed within the 4.5 months long campaigns that we organized on those two objects in 2009. During these campaigns we collected the most complete simultaneous multi-frequency data set from these blazars up to date, which includes, for the first time, the information from the GeV energies measured by Fermi-LAT.
Fermi Collaboration
Paneque David
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