Observational evidence for the origin of high-energy neutrinos in
parsec-scale nuclei of radio-bright active galaxies
A. Plavin, Y. Kovalev, Y. Kovalev, and S. Troitsky. (2020)cite arxiv:2001.00930Comment: 19 pages, 5 figures, 3 tables; accepted to ApJ; v2: extended discussion, added a figure and electronic table; v3: fixed typo in a source name.
DOI: 10.3847/1538-4357/ab86bd
Abstract
Observational information on high-energy astrophysical neutrinos is being
continuously collected by the IceCube observatory. However, the sources of
neutrinos are still unknown. In this study, we use radio very-long-baseline
interferometry (VLBI) data for a complete VLBI-flux-density limited sample of
active galactic nuclei (AGN). We address the problem of the origin of
astrophysical neutrinos with energies above 200 TeV in a statistical manner. It
is found that AGN positionally associated with IceCube events have typically
stronger parsec-scale cores than the rest of the sample. The post-trial
probability of a chance coincidence is 0.2%. We select the four strongest AGN
as highly probable associations: 3C 279, NRAO 530, PKS 1741-038, and PKS
2145+067. Moreover, we find an increase of radio emission at frequencies above
10 GHz around neutrino arrival times for several other VLBI-selected AGN on the
basis of RATAN-600 monitoring. The most pronounced example of such behavior is
PKS 1502+106. We conclude that AGN with bright Doppler-boosted jets constitute
an important population of neutrino sources. High-energy neutrinos are produced
in their central parsec-scale regions, probably in proton-photon interactions
at or around the accretion disk. Radio-bright AGN that are likely associated
with neutrinos have very diverse gamma-ray properties suggesting that
gamma-rays and neutrinos may be produced in different regions of AGN and not
directly related. A small viewing angle of the jet-disk axis is, however,
required to detect either of them.
Description
[2001.00930] Observational evidence for the origin of high-energy neutrinos in parsec-scale nuclei of radio-bright active galaxies
cite arxiv:2001.00930Comment: 19 pages, 5 figures, 3 tables; accepted to ApJ; v2: extended discussion, added a figure and electronic table; v3: fixed typo in a source name
%0 Generic
%1 plavin2020observational
%A Plavin, A. V.
%A Kovalev, Y. Y.
%A Kovalev, Y. A.
%A Troitsky, S. V.
%D 2020
%K IceCube alert neutrino plain radio systematics
%R 10.3847/1538-4357/ab86bd
%T Observational evidence for the origin of high-energy neutrinos in
parsec-scale nuclei of radio-bright active galaxies
%U http://arxiv.org/abs/2001.00930
%X Observational information on high-energy astrophysical neutrinos is being
continuously collected by the IceCube observatory. However, the sources of
neutrinos are still unknown. In this study, we use radio very-long-baseline
interferometry (VLBI) data for a complete VLBI-flux-density limited sample of
active galactic nuclei (AGN). We address the problem of the origin of
astrophysical neutrinos with energies above 200 TeV in a statistical manner. It
is found that AGN positionally associated with IceCube events have typically
stronger parsec-scale cores than the rest of the sample. The post-trial
probability of a chance coincidence is 0.2%. We select the four strongest AGN
as highly probable associations: 3C 279, NRAO 530, PKS 1741-038, and PKS
2145+067. Moreover, we find an increase of radio emission at frequencies above
10 GHz around neutrino arrival times for several other VLBI-selected AGN on the
basis of RATAN-600 monitoring. The most pronounced example of such behavior is
PKS 1502+106. We conclude that AGN with bright Doppler-boosted jets constitute
an important population of neutrino sources. High-energy neutrinos are produced
in their central parsec-scale regions, probably in proton-photon interactions
at or around the accretion disk. Radio-bright AGN that are likely associated
with neutrinos have very diverse gamma-ray properties suggesting that
gamma-rays and neutrinos may be produced in different regions of AGN and not
directly related. A small viewing angle of the jet-disk axis is, however,
required to detect either of them.
@misc{plavin2020observational,
abstract = {Observational information on high-energy astrophysical neutrinos is being
continuously collected by the IceCube observatory. However, the sources of
neutrinos are still unknown. In this study, we use radio very-long-baseline
interferometry (VLBI) data for a complete VLBI-flux-density limited sample of
active galactic nuclei (AGN). We address the problem of the origin of
astrophysical neutrinos with energies above 200 TeV in a statistical manner. It
is found that AGN positionally associated with IceCube events have typically
stronger parsec-scale cores than the rest of the sample. The post-trial
probability of a chance coincidence is 0.2%. We select the four strongest AGN
as highly probable associations: 3C 279, NRAO 530, PKS 1741-038, and PKS
2145+067. Moreover, we find an increase of radio emission at frequencies above
10 GHz around neutrino arrival times for several other VLBI-selected AGN on the
basis of RATAN-600 monitoring. The most pronounced example of such behavior is
PKS 1502+106. We conclude that AGN with bright Doppler-boosted jets constitute
an important population of neutrino sources. High-energy neutrinos are produced
in their central parsec-scale regions, probably in proton-photon interactions
at or around the accretion disk. Radio-bright AGN that are likely associated
with neutrinos have very diverse gamma-ray properties suggesting that
gamma-rays and neutrinos may be produced in different regions of AGN and not
directly related. A small viewing angle of the jet-disk axis is, however,
required to detect either of them.},
added-at = {2022-07-13T16:52:51.000+0200},
author = {Plavin, A. V. and Kovalev, Y. Y. and Kovalev, Y. A. and Troitsky, S. V.},
biburl = {https://www.bibsonomy.org/bibtex/2a624fba021497e08a852a9a765a71d6b/jnecker},
description = {[2001.00930] Observational evidence for the origin of high-energy neutrinos in parsec-scale nuclei of radio-bright active galaxies},
doi = {10.3847/1538-4357/ab86bd},
interhash = {c8f051bab0ac7debdc99da19db598b2f},
intrahash = {a624fba021497e08a852a9a765a71d6b},
keywords = {IceCube alert neutrino plain radio systematics},
note = {cite arxiv:2001.00930Comment: 19 pages, 5 figures, 3 tables; accepted to ApJ; v2: extended discussion, added a figure and electronic table; v3: fixed typo in a source name},
timestamp = {2022-07-13T16:52:51.000+0200},
title = {Observational evidence for the origin of high-energy neutrinos in
parsec-scale nuclei of radio-bright active galaxies},
url = {http://arxiv.org/abs/2001.00930},
year = 2020
}