Journal Article

PUBDB-2020-02970

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png The $\gamma$-ray Emission of Star-Forming Galaxies

Ajello, M. (Corresponding author) ; Di Mauro, M. (Corresponding author) ; Paliya, V. S. (Corresponding author)DESY* ; Garrappa, S.DESY*

2020
Chicago, Ill. [u.a.]

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Please use a persistent id in citations: doi:10.3847/1538-4357/ab86a6  doi:10.3204/PUBDB-2020-02970

Report No.: arXiv:2003.05493

Abstract: A majority of the γ-ray emission from star-forming galaxies is generated by the interaction of high-energy cosmic rays with the interstellar gas and radiation fields. Star-forming galaxies are expected to contribute to both the extragalactic γ-ray background and the IceCube astrophysical neutrino flux. Using roughly 10 yr of γ-ray data taken by the Fermi Large Area Telescope, in this study we constrain the γ-ray properties of star-forming galaxies. We report the detection of 11 bona fide γ-ray-emitting galaxies and 2 candidates. Moreover, we show that the cumulative γ-ray emission of below-threshold galaxies is also significantly detected at ∼5σ confidence. The γ-ray luminosity of resolved and unresolved galaxies is found to correlate with the total (8–1000 μm) infrared luminosity as previously determined. Above 1 GeV, the spectral energy distribution of resolved and unresolved galaxies is found to be compatible with a power law with a photon index of ≈2.2–2.3. Finally, we find that star-forming galaxies account for roughly 5% and 3% of the extragalactic γ-ray background and the IceCube neutrino flux, respectively.

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Contributing Institute(s):

1. Neutrinoteleskop (ZEU-ICE)

Research Program(s):

1. 613 - Matter and Radiation from the Universe (POF3-613) (POF3-613)

Experiment(s):

1. IceCube South Pole Neutrino Observatory
2. The Fermi Large Area Telescope

Appears in the scientific report 2020

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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