NDLI: New theoretical estimates of the contribution of unresolved star-forming galaxies to the extragalactic gamma-ray background (egb) as measured by egret and the fermi-lat

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New theoretical estimates of the contribution of unresolved star-forming galaxies to the extragalactic gamma-ray background (egb) as measured by egret and the fermi-lat

Content Provider	NASA Technical Reports Server (NTRS)
Author	Venters, Tonia M.
Copyright Year	2011
Description	We present new theoretical estimates of the contribution of unresolved star-forming galaxies to the extragalactic gamma-ray background (EGB) as measured by EGRET and the Fermi-LAT. We employ several methods for determining the star-forming galaxy contribution the the EGB, including a method positing a correlation between the gamma-ray luminosity of a galaxy and its rate of star formation as calculated from the total infrared luminosity, and a method that makes use of a model of the evolution of the galaxy gas mass with cosmic time. We find that depending on the model, unresolved star-forming galaxies could contribute significantly to the EGB as measured by the Fermi-LAT at energies between approx. 300 MeV and approx. few GeV. However, the overall spectrum of unresolved star-forming galaxies can explain neither the EGRET EGB spectrum at energies between 50 and 200 MeV nor the Fermi-LAT EGB spectrum at energies above approx. few GeV.
File Size	32305
Page Count	1
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20110020749
Archival Resource Key	ark:/13960/t12p03w4d
Language	English
Publisher Date	2011-09-07
Access Restriction	Open
Subject Keyword	Astrophysics Correlation Galaxies Galactic Evolution Gamma Ray Observatory Luminosity Spectra Estimates Gamma Rays Gamma Ray Telescopes Star Formation Reaction Kinetics Astronomical Models Infrared Radiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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