The gamma-ray and neutrino sky: a consistent picture of Fermi-LAT, H.E.S.S., Milagro, and IceCube results

Gaggero, Daniele; Urbano, Alfredo; Valli, Mauro; Grasso, Dario; Marinelli, Antonio

doi:10.1088/2041-8205/815/2/L25

Article
Report number	arXiv:1504.00227
Title	The gamma-ray and neutrino sky: a consistent picture of Fermi-LAT, H.E.S.S., Milagro, and IceCube results
Author(s)	Gaggero, Daniele (INFN, Pisa ; SISSA, Trieste ; U. Amsterdam, GRAPPA) ; Grasso, Dario (INFN, Pisa ; Pisa U.) ; Marinelli, Antonio (INFN, Pisa ; Pisa U.) ; Urbano, Alfredo (INFN, Trieste ; SISSA, Trieste ; CERN) ; Valli, Mauro (INFN, Trieste ; SISSA, Trieste)
Publication	2015-12-16
Imprint	01 Apr 2015
Number of pages	5
Note	5 pages, 3 figures
In:	Astrophys. J. 815 (2015) L25
DOI	10.1088/2041-8205/815/2/L25
Subject category	Astrophysics and Astronomy
Abstract	In this Letter we propose a novel interpretation of the anomalous TeV gamma-ray diffuse emission observed by Milagro in the inner Galactic plane consistent with the signal reported by H.E.S.S. in the Galactic ridge; remarkably, our picture also accounts for a relevant portion of the neutrino flux measured by IceCube. Our scenario is based on a recently proposed phenomenological model characterized by radially-dependent cosmic-ray (CR) transport properties. Designed to reproduce both Fermi-LAT gamma-ray data and local CR observables, this model offers for the first time a self-consistent picture of both the GeV and the TeV sky.
Copyright/License	arXiv nonexclusive-distrib. 1.0

$The diffuse emission $\gamma$-ray spectrum from the inner Galactic plane ($|b| < 2^\circ$, $30^\circ < b < 65^\circ$) computed for the reference models considered in this Letter is compared with Fermi-LAT and Milagro data. The Milagro differential flux reported here is 17\,\% lower respect to the flux reported in 2008 \cite{MilagroPlane} due to the assumption of a spectral index of 2.4 instead of 2.7 \cite{MilagroPrivate}. The expected sensitivity of HAWC \cite{HAWK} and CTA \cite{CTA} are reported. The spectral components are shown for the KRA$_\gamma$ model only.$ $The computed $\gamma$-ray diffuse emission from the Galactic ridge region is compared with Fermi-LAT and H.E.S.S. data. For each model the spectrum normalization has been varied to minimize the $\chi^2$ against the data. The spectral components are shown for the KRA$_\gamma$ model only. {Fermi-LAT: $5$ years of data, within the event class {\tt ULTRACLEAN} according to Fermi tools {\tt v9r32p5} as described in \cite{WeiEAlfredo}. The point sources taken from the four-year Point Source Catalogue (3FGL) \cite{FermiSourceCat} were substracted from the data.}$ $The computed proton and Helium (in the insert) spectra at the solar circle are compared with a representative set of experimental data. All spectra account for solar modulation with a potential $\Phi = 0.5~{\rm GV}$.$ Show more plots

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