Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...723.1082a&link_type=abstract
The Astrophysical Journal, Volume 723, Issue 2, pp. 1082-1096 (2010).
Astronomy and Astrophysics
Astronomy
34
Diffuse Radiation, Dust, Extinction, Gamma Rays: General
Scientific paper
The extragalactic background light (EBL) includes photons with wavelengths from ultraviolet to infrared, which are effective at attenuating gamma rays with energy above ~10 GeV during propagation from sources at cosmological distances. This results in a redshift- and energy-dependent attenuation of the γ-ray flux of extragalactic sources such as blazars and gamma-ray bursts (GRBs). The Large Area Telescope on board Fermi detects a sample of γ-ray blazars with redshift up to z ~ 3, and GRBs with redshift up to z ~ 4.3. Using photons above 10 GeV collected by Fermi over more than one year of observations for these sources, we investigate the effect of γ-ray flux attenuation by the EBL. We place upper limits on the γ-ray opacity of the universe at various energies and redshifts and compare this with predictions from well-known EBL models. We find that an EBL intensity in the optical-ultraviolet wavelengths as great as predicted by the "baseline" model of Stecker et al. can be ruled out with high confidence.
Abdo Aws Ahmad
Ackermann Marcelo
Ajello Marco
Allafort Alice
Atwood William B.
No associations
LandOfFree
Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fermi Large Area Telescope Constraints on the Gamma-ray Opacity of the Universe will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1160140