Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3313g&link_type=abstract
American Astronomical Society, HEAD meeting #11, #33.13; Bulletin of the American Astronomical Society, Vol. 41, p.707
Astronomy and Astrophysics
Astronomy
Scientific paper
We propose a method for setting upper limits to the infrared to ultraviolet extragalactic background light (EBL). Our method uses simultaneous Fermi-LAT GeV and ground-based TeV observations of blazars and is based on the assumption that the intrinsic TeV spectral energy distribution (SED) of TeV blazars lies
below the extrapolation of the GeV SED from GeV toTeV energies. If this is the case, by extrapolating the Fermi-LAT spectrum, which is practically unattenuated by photon-photon pair production with EBL photons, to TeV energies, a firm upper limit on the intrinsic TeV SED is provided. The ratio of this upper limit on the TeV spectrum to the observed TeV spectrum provides an upper limit to the optical depth for the propagation of the TeV photons due to pair production on the EBL, which in turn sets firm upper limits on the EBL. We demonstrate this method using recent simultaneous observations with Fermi-LAT and TeV atmospheric Cherenkov telescopes of the blazar object PKS 2155-304.
Finke Justin
Georganopoulos Markos
Reyes Luis
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