TY - JOUR

T1 - A new multi-messenger description of starburst galaxies emission

T2 - perspectives for neutrino and gamma-ray observations

AU - Marinelli, Antonio

AU - Ambrosone, Antonio

AU - Chianese, Marco

AU - Fiorillo, Damiano

AU - Miele, Gennaro

AU - Pisanti, Ofelia

PY - 2023/1/26

Y1 - 2023/1/26

N2 - Star-forming and starburst galaxies (SBGs), which are well-known cosmic-ray (CR) reservoirs, are expected to emit gamma rays and neutrinos predominantly via hadronic collisions. In this work we analyze the 10-year Fermi-Low Energy Technique (LAT) spectral energy distributions of 13 nearby galaxies by means of a physical model that accounts for high-energy proton transport in starburst nuclei and includes the contribution of primary and secondary electrons. In particular, we test the hypothesis that the observed gamma-ray fluxes are mostly due to star-forming activity, which is in agreement with the available star formation rates coming from infrared (IR) and ultraviolet (UV) observations. Through this observation-based approach, we determine the most-likely neutrino counterparts from star-forming and SBGs and quantitatively assess the ability of current and upcoming neutrino telescopes to detect them as point-like sources. We also generate mock gamma-ray data to simulate the Cherenkov Telescope Array (CTA) performance in detecting these sources. Moreover, we propose a test to discriminate between the two different CR transport models for the starburst nuclei by looking at the different gamma-ray expectations. We point out that current data already gives a slight preference to CR models, which are dominated by advection.

AB - Star-forming and starburst galaxies (SBGs), which are well-known cosmic-ray (CR) reservoirs, are expected to emit gamma rays and neutrinos predominantly via hadronic collisions. In this work we analyze the 10-year Fermi-Low Energy Technique (LAT) spectral energy distributions of 13 nearby galaxies by means of a physical model that accounts for high-energy proton transport in starburst nuclei and includes the contribution of primary and secondary electrons. In particular, we test the hypothesis that the observed gamma-ray fluxes are mostly due to star-forming activity, which is in agreement with the available star formation rates coming from infrared (IR) and ultraviolet (UV) observations. Through this observation-based approach, we determine the most-likely neutrino counterparts from star-forming and SBGs and quantitatively assess the ability of current and upcoming neutrino telescopes to detect them as point-like sources. We also generate mock gamma-ray data to simulate the Cherenkov Telescope Array (CTA) performance in detecting these sources. Moreover, we propose a test to discriminate between the two different CR transport models for the starburst nuclei by looking at the different gamma-ray expectations. We point out that current data already gives a slight preference to CR models, which are dominated by advection.

KW - high-energy neutrinos

KW - non-thermal emission

KW - starburst galaxies

KW - STAR-FORMATION

KW - FERMI-LAT

KW - TRANSPORT

KW - ORIGIN

U2 - 10.1002/asna.20220137

DO - 10.1002/asna.20220137

M3 - Journal article

VL - 344

JO - Astronomische Nachrichten

JF - Astronomische Nachrichten

SN - 0004-6337

IS - 1-2

M1 - e220137

ER -