Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21723102g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #231.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Gamma rays traveling across extragalactic distances are attenuated due to electron-positron pair production interactions with the extragalactic background light (EBL). I will present new EBL calculations based on semi-analytic models. These models predict the EBL by using physically-motivated prescriptions for galaxy formation in a WMAP5 cold dark matter cosmology. Dust reemission of starlight in the mid- and far-IR is included using templates based on Spitzer data. Our latest models are successful in reproducing a large variety of observational constraints such as number counts, mass functions, and evolving luminosity functions at a wide range of wavelengths. Observations of blazars and gamma-ray bursts at GeV and TeV energies can be used to set limits on the background light, and therefore constrain models of structure formation. I will show a comparison of our model with recent limits from gamma-ray telescopes.
This work has been supported by a Fermi Guest Investigator Grant, and by SISSA/ISAS.
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