Search for spatial coincidence between IceCube neutrinos and radio pulsars

Article Astronomy & Astrophysics

Evidence of High-energy Neutrinos from SN1987A by Kamiokande-II and IMB

Yuichi Oyama

Summary: Possible evidence of high-energy neutrinos from SN1987A was found through the observation of upward-going muons recorded by the Kamiokande-II experiment and the IMB experiment.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Constraints on Hadronic Contributions to LHAASO Sources with Neutrino Observations

Tian-Qi Huang et al.

Summary: The LHAASO observed 12 high-energy gamma-ray sources and summarized the neutrino measurements by IceCube and ANTARES to constrain the contribution of hadronic gamma-rays. It was found that gamma-rays from two sources are dominated by leptonic components.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Classification of pulsars using Extreme Deconvolution

Tarun Tej Reddy Ch et al.

Summary: Based on Extreme Deconvolution using Gaussian Mixture Model, we classified the observed pulsar dataset into six clusters, with two clusters for millisecond pulsars and four clusters for ordinary pulsars. However, this classification did not provide additional insights into the pulsar population. Our numerical experiments showed that Extreme Deconvolution-based classification is less sensitive to dataset variations compared to traditional Gaussian Mixture Models. All analysis codes used in this study have been made publicly available.

NEW ASTRONOMY (2022)

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Article Astronomy & Astrophysics

Search for Spatial Correlations of Neutrinos with Ultra-high-energy Cosmic Rays

A. Albert et al.

Summary: This paper presents three different approaches for correlating ultra-high-energy cosmic rays (UHECRs) with high-energy neutrinos in order to solve the unsolved mystery of the origin of UHECRs. Through the analyses, no significant excess was found, leading to further constraints on the neutrino flux spatially correlated with UHECRs.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Combined significance of spatial coincidence of high energy neutrinos from PSR B1509-58 by Super-Kamiokande and MACRO

Shantanu Desai

Summary: In their search for astrophysical point sources of high energy neutrinos, both the Super-Kamiokande and MACRO neutrino detectors observed the largest angular excess from the same source, PSR B1509-58. The probability for the observed number of events by both detectors to be a chance coincidence due to atmospheric neutrino background is estimated to be about 0.4%, corresponding to a significance of 2.6 sigma. Additional tests are proposed to determine if this excess corresponds to an astrophysical signal or is merely a background event.

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS (2022)

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Article Astronomy & Astrophysics

Galactic Contribution to the High-energy Neutrino Flux Found in Track-like IceCube Events

Y. Y. Kovalev et al.

Summary: Researchers analyzed the distribution of arrival directions of high-energy neutrinos in the Galaxy and found deviations from the null hypothesis of isotropic neutrino flux. This suggests the presence of a significant component of high-energy neutrinos of Galactic origin, matching observations of diffuse Galactic gamma rays.

ASTROPHYSICAL JOURNAL LETTERS (2022)

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Article Astronomy & Astrophysics

Investigating the correlations between IceCube high-energy neutrinos and Fermi-LAT γ-ray observations

Rong-Lan Li et al.

Summary: This study investigates the correlation between high-energy neutrinos and various Fermi-LAT gamma-ray samples using ten years of publicly available IceCube data. The results show no significant high-energy neutrino production from the sources in these samples. Compared to previous studies, the constraints are improved due to the longer timeframe of data used.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Search for High-energy Neutrino Emission from Galactic X-Ray Binaries with IceCube

R. Abbasi et al.

Summary: This study presents the first comprehensive search for high-energy neutrino emission from high- and low-mass X-ray binaries conducted by IceCube. The findings are important for understanding the mechanisms behind cosmic-ray and neutrino production in the Milky Way.

ASTROPHYSICAL JOURNAL LETTERS (2022)

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Review Physics, Multidisciplinary

Constraints on models of the origin of high-energy astrophysical neutrinos

S. V. Troitsky

Summary: The existence of astrophysical neutrinos with energies of tens of TeV and higher has been confirmed by the IceCube experiment, but observational results do not fully agree with expectations. The origin of neutrinos remains undetermined and simple theoretical models have limitations. Observational data suggest that the astrophysical neutrino flux may include contributions from both extragalactic and Galactic sources.

PHYSICS-USPEKHI (2021)

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Article Astronomy & Astrophysics

IceCube high-energy starting event sample: Description and flux characterization with 7.5 years of data

R. Abbasi et al.

Summary: The IceCube Neutrino Observatory has confirmed the existence of a high-energy all-sky neutrino flux of astrophysical origin, analyzing the high-energy starting event sample with additional data and improved models. The astrophysical neutrino spectrum is found to be compatible with an unbroken power law, with a preferred spectral index of 2.87 for the 68% confidence interval.

PHYSICAL REVIEW D (2021)

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Article Astronomy & Astrophysics

Search for high-energy neutrino emission from radio-bright AGN

Bei Zhou et al.

Summary: The study suggests that radio-bright AGN are unlikely to be responsible for the TeV-PeV neutrinos detected by IceCube, as the two most significant sources in the catalog do not show high global significance. Stacking analyses reveal no significant correlation between the whole catalog and IceCube neutrinos.

PHYSICAL REVIEW D (2021)

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Article Physics, Multidisciplinary