Joint Constraints on Galactic Diffuse Neutrino Emission from the ANTARES and IceCube Neutrino Telescopes

Abstract

The existence of diffuse Galactic neutrino production is expected from cosmic-ray interactions with Galactic gas and radiation fields. Thus, neutrinos are a unique messenger offering the opportunity to test the products of Galactic cosmic-ray interactions up to energies of hundreds of TeV. Here we present a search for this production using ten years of Astronomy with a Neutrino Telescope and Abyss environmental RESearch (ANTARES) track and shower data, as well as seven years of IceCube track data. The data are combined into a joint likelihood test for neutrino emission according to the KRA g model assuming a 5 PeV per nucleon Galactic cosmic-ray cutoff. No significant excess is found. As a consequence, the limits presented in this Letter start constraining the model parameter space for Galactic cosmic-ray production and transport.

Search for Sources of Astrophysical Neutrinos Using Seven Years of IceCube Cascade Events

“…The sensitivities of the diffuse Galactic template analyses are listed in Table 2. This analysis obtains ∼30% (40%) better sensitivity to g KRA 5 ( g KRA 50 ) than the recent joint IceCube +ANTARES analysis (Albert et al 2018). Compared to the IceCube analysis using seven years of tracks (Aartsen et al 2017b), this analysis obtains ∼15% better sensitivity to emission following the spatial profile of the Fermi-LATπ 0 -decay measurement.…”

“…The latest constraints on diffuse Galactic neutrino emission depend on the g KRA models and were obtained in a joint IceCube and ANTARES analysis (Albert et al 2018) which made use of complementary features of the IceCube track analysis (Aartsen et al 2017b) and ANTARES track and cascade combined analysis (Albert et al 2017b). In this work we search for emission following g KRA 5 as the primary diffuse Galactic emission result; we also test for emission following g KRA 50 .…”

“…5 · ( ) · in units 10 −11 TeV cm −2 s −1 for Fermi-LAT π 0 decay. The latest previous results are from a joint IceCube-ANTARES analysis (Albert et al 2018) for g KRA and from IceCube tracks (Aartsen et al 2017b) for Fermi-LAT π 0 decay. efficient rejection of atmospheric backgrounds for the cascade data set used in this work.…”

Observing EeV neutrinos through Earth: GZK and the anomalous ANITA events

“…These initial measurements have been confirmed recently with 9.5 years of northern sky muon-neutrino data [13] and 7.5 years of all-sky starting event data [14]. The astrophysical flux observed by IceCube saturates the theoretical flux expectations [15] and is predominantly extragalactic [16]. Intriguingly, as well, the total energy density in high-energy neutrinos is similar to the energy density of the UHECRs which might hint at their common origin.…”

High Energy Neutrino Astronomy: Where Do We Stand, Where Do We Go?

“…Although no significant correlations have been detected so far, the IceCube/ANTARES alerts and the triggered electromagnetic-domain observations herald the era of multi-messenger observation. This remark also applies to the follow-up programs where IceCube scrutinizes its own data to search for correlations with signals from Gravitational Waves [32].…”