NDLI: Defining the ibl and gamma-ray absorption

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Defining the ibl and gamma-ray absorption

Content Provider	NASA Technical Reports Server (NTRS)
Author	Stecker, Floyd
Copyright Year	2012
Description	We calculate the intensity and photon spectrum of the intergalactic background light (IBL) as a function of redshift using an approach based on observational data obtained in many different wavelength bands from local to deep galaxy surveys. Our empirically based approach allows us, for the first time, to obtain a completely model independent determination of the IBL and to quantify its uncertainties. Using our results on the IBL, we then place 68% confidence upper and lower limits on the opacity of the universe to gamma-rays, independent of previous constraints that were obtained by making theoretical assumptions. We then compare our results with measurements of the extragalactic background light and upper limits obtained from observations made by the Fermi Gamma-ray Space Telescope.
File Size	151846
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20120013701
Archival Resource Key	ark:/13960/t39074410
Language	English
Publisher Date	2012-08-13
Access Restriction	Open
Subject Keyword	Space Radiation Red Shift Light Visible Radiation Intergalactic Media Universe Photons Extraterrestrial Radiation Opacity Gamma Ray Absorption Fermi Gamma-ray Space Telescope Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Presentation

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