A stacked search for spatial coincidences  between IceCube neutrinos and radio pulsars

Pasumarti, Vibhavasu; Desai, Shantanu

doi:10.1088/1475-7516/2024/04/010

J. Cosmol. Astropart. Phys.

2024

DOI: 10.1088/1475-7516/2024/04/010

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A stacked search for spatial coincidences between IceCube neutrinos and radio pulsars

Vibhavasu Pasumarti,

Shantanu Desai

Abstract: We carry out a stacked search for spatial coincidences between all the known radio pulsars and TeV neutrinos from the IceCube 10 year (2008–2018) muon track data, as a followup to our previous work on searching for spatial coincidences with individual pulsars. We consider three different weighting schemes to stack the contributions from each pulsar. We do not find a statistically significant excess using this method. We report the 95% c.l. neutrino flux upper limit as a function of the neutrino en… Show more

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2024

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Search for MeV gamma-ray emission from TeV bright red dwarfs with COMPTEL

Shrivastava,

Manna,

Desai

2024

J. Cosmol. Astropart. Phys.

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The SHALON atmospheric Cherenkov telescope has detected very high energy gamma-ray emission at TeV energies from eight red dwarfs, namely, V388 Cas, V547 Cas, V780 Tau, V962 Tau, V1589 Cyg, GJ 1078, GJ 3684 and GL 851.1. Consequently, these red dwarfs have been suggested as sources of ultra-high energy cosmic rays. In this work, we search for soft gamma-ray emission from these TeV bright red dwarfs between 0.75–30 MeV using archival data from the COMPTEL gamma-ray imaging telescope, as a follow-up to a similar search for GeV gamma-ray emission using the Fermi-LAT telescope. Although, prima-facie, we detect non-zero photon flux from three red dwarfs with high significance, these signals can attributed to contamination from nearby sources such as Crab and Cygnus, which are within the angular resolution of COMPTEL, and have been previously detected as very bright point sources at MeV energies. Therefore, we could not detect any statistically significant signal (> 3σ) from any of these eight red dwarfs from 0.75–30 MeV. We then report the 95% confidence level upper limits on the differential photon flux (at 30 MeV), integral photon flux and integral energy flux for all of the eight red dwarfs. The integral energy flux limits range between 10-11 - 10-10-ergs/cm2/s.

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Search for MeV gamma-ray emission from TeV bright red dwarfs with COMPTEL

Shrivastava,

Manna,

Desai

2024

J. Cosmol. Astropart. Phys.

View full text Add to dashboard Cite

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Lμ−Lτ solution to the IceCube ultrahigh-energy neutrino deficit in light of NA64

de la Vega,

Peinado,

Wudka

2024

Phys. Rev. D

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In this work we analyze the scenario where a MeV scale Lμ−Lτ gauge boson can explain the deficit in the diffuse ultrahigh-energy (UHE) astrophysical neutrino spectrum observed in IceCube, as well as the discrepancy between experimental and e+e− scattering data-driven Standard Model calculations of the muon anomalous magnetic moment. We map the parameter space of the model where the elastic resonant s-channel scattering of UHE neutrinos with the cosmic neutrino background, mediated by the new Z′, can improve the description of the observed cascade and track spectra over the no-scattering hypothesis. Comparing to recent NA64-μ results, we find that some part of the parameter space remains unexplored, but at a data volume of 1011 muons on target NA64-μ will completely probe this region. Published by the American Physical Society 2024

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A stacked search for spatial coincidences between IceCube neutrinos and radio pulsars

Cited by 2 publications

References 43 publications

Search for MeV gamma-ray emission from TeV bright red dwarfs with COMPTEL

Search for MeV gamma-ray emission from TeV bright red dwarfs with COMPTEL

Lμ−Lτ solution to the IceCube ultrahigh-energy neutrino deficit in light of NA64

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