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arXiv · 1412.8361

Star-forming galaxies as the origin of the IceCube PeV neutrinos

Xiao-Chuan Chang·Ruo-Yu Liu·Xiang-Yu Wang
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Abstract

Star-forming galaxies, due to their high star-formation rates and hence large number of supernova remnants therein, are huge reservoirs of cosmic rays (CRs). These CRs collide with gases in the galaxies and produce high-energy neutrinos through $pp$ collisions. In this paper, we calculate the neutrino production efficiency in star-forming galaxies by considering realistic galaxy properties, such as the gas density and galactic wind in star-forming galaxies. To calculate the accumulated neutrino flux, we use the infrared luminosity function of star-forming galaxies obtained by {\em Herschel} PEP/HerMES survey recently. The intensity of CRs producing PeV neutrinos in star-forming galaxies is normalized with the observed CR flux at EeV ({1\,EeV=$10^{18}\,$eV}), assuming that supernova remnants or hypernova remnants in star-forming galaxies can accelerate protons to EeV energies. Our calculations show that the accumulated neutrino emission produced by CRs in star-forming galaxies can account for the flux and spectrum of the sub-PeV/PeV neutrinos under reasonable assumptions on the CR confinement time in these galaxies.

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Xiao-Chuan Chang, Ruo-Yu Liu, Xiang-Yu Wang. 2015-03-23. Star-forming galaxies as the origin of the IceCube PeV neutrinos. https://doi.org/10.1088/0004-637x%2F805%2F2%2F95

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