Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21921304a&link_type=abstract
American Astronomical Society, AAS Meeting #219, #213.04
Physics
Scientific paper
Recent detections of the starburst galaxies M82 and NGC 253 by gamma-ray telescopes suggest that galaxies rapidly forming massive stars are more luminous at gamma-ray energies compared to their quiescent relatives. Building upon those results, we examine a sample of 69 dwarf, spiral, and luminous and ultraluminous infrared galaxies using more than two years of data collected by the Large Area Telescope (LAT) on the Fermi Gamma-ray Space Telescope (Fermi). Measured fluxes from significantly detected sources and flux upper limits for the remaining galaxies in the sample are used to explore the physics of cosmic rays in star-forming galaxies. We confirm quasilinear scaling relations between both radio continuum luminosity and total infrared luminosity with gamma-ray luminosity which apply both to quiescent galaxies of the Local Group and low-redshift starburst galaxies. Using the relationship between infrared luminosity and gamma-ray luminosity, we estimate that unresolved star-forming galaxies at redshifts 0 < z < 2.5 constitute 3-25% of the isotropic diffuse gamma-ray background intensity between 0.1-100 GeV.
Ajello Marco
Bechtol Keith
Fermi LAT Collaboration
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