Particle theory

Abstract:

Papers on the searches for the sources of astrophysical neutrinos, submitted to the 35th International Cosmic Ray Conference (ICRC 2017, Busan, South Korea) by the IceCube Collaboration

Contents

1 - Searching for VHE gamma-ray emission associated with IceCube astrophysical neutrinos using FACT, H.E.S.S., MAGIC, and VERITAS

2 - Search for point-like sources in the astrophysical muon neutrino flux with IceCube

3 - Search for weak neutrino point sources using angular auto-correlation analyses in IceCube

4 - All-sky search for correlations in the arrival directions of astrophysical neutrino candidates and ultrahigh-energy cosmic rays

5 - Results of IceCube searches for neutrinos from blazars using seven years of through-going muon data

6 - IceCube Search for Neutrinos from 1ES 1959+650: Completing the Picture

7 - Using all-flavor and all-sky event selections by IceCube to search for neutrino emission from the Galactic plane

8 - Constraints on diffuse neutrino emission from the Galactic Plane with 7 years of IceCube data

9 - Search for extended sources of neutrino emission with 7 years of IceCube data

10 - Search for a cumulative neutrino signal from blazar flares using IceCube data

11 - Investigation of Obscured Flat Spectrum Radio AGN with the IceCube Neutrino Observatory

12 - Realtime neutrino alerts and follow-up in IceCube

13 - Search for High-Energy Neutrino Emission from Fast Radio Bursts

14 - IceCube as a Neutrino Follow-up Observatory for Astronomical Transients

Abstract:

We present an all-sky search for muon neutrinos produced during the prompt γ-ray emission of 1172 gamma-ray bursts (GRBs) with the IceCube Neutrino Observatory. The detection of these neutrinos would constitute evidence for ultra-high-energy cosmic-ray (UHECR) production in GRBs, as interactions between accelerated protons and the prompt γ-ray field would yield charged pions, which decay to neutrinos. A previously reported search for muon neutrino tracks from northern hemisphere GRBs has been extended to include three additional years of IceCube data. A search for such tracks from southern hemisphere GRBs in five years of IceCube data has been introduced to enhance our sensitivity to the highest energy neutrinos. No significant correlation between neutrino events and observed GRBs is seen in the new data. Combining this result with previous muon neutrino track searches and a search for cascade signature events from all neutrino flavors, we obtain new constraints for single-zone fireball models of GRB neutrino and UHECR production.

Abstract:

We extend previous searches for X-ray spectral modulations induced by ALP-photon conversion to a variety of new sources, all consisting of quasars or AGNs located in or behind galaxy clusters. We consider a total of seven new sources, with data drawn from the Chandra archive. In all cases the spectrum is well fit by an absorbed power-law with no evidence for spectral modulations, allowing constraints to be placed on the ALP-photon coupling parameter $g_{a\gamma\gamma}$. Two sources are particularly good: the Seyfert galaxy 2E3140 in A1795 and the AGN NGC3862 within the cluster A1367, leading to 95\% bounds for light ALPs ($m_a \lesssim 10^{-12} {\rm eV}$) of $g_{a\gamma\gamma} \lesssim 1.5 \times 10^{-12} {\rm GeV}^{-1}$ and $g_{a\gamma\gamma} \lesssim 2.4 \times 10^{-12} {\rm GeV}^{-1}$ respectively.