Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Plavin, A. V.; Kovalev, Y. Y.; Kovalev, Y. A.; Troitsky, S. V.

doi:10.48550/arxiv.2009.08914

Cited by 3 publications

(5 citation statements)

References 51 publications

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“…We simply note that there is no obvious reason to exclude any of the sources as a possible neutrino emitter. This is also in line with the discussion in Plavin et al (2020b). They did not find reasons to disfavor the non γ-ray AGNs as neutrino sources in terms of target photon fields or the accelerated protons.…”

Section: Connection With γ-Ray Emissionsupporting

confidence: 87%

“…The number of associations we find is in general small, only with 12 − 28% of the 57 neutrino events, depending on the radio sample used. The small number of associations can be largely explained by incomplete parent samples of radio sources used in this study and is not in contradiction with the recent studies of Plavin et al (2020a); Plavin et al (2020b) associating the observed astrophysical neutrino flux to radio bright AGN.…”

Section: Discussioncontrasting

confidence: 46%

“…Moreover, 1 http://astrogeo.org/vlbi/solutions/rfc_2019c/ they found an average increase of radio emission at frequencies above 10 GHz around neutrino arrival times for several AGNs on the basis of RATAN-600 monitoring. In Plavin et al (2020b) they further analyzed the IceCube point source likelihood map, including also lower energy events, against the RFC catalogue and found a 3σ significance for the correlation between them.…”

Section: Introductionmentioning

confidence: 99%

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Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories

Hovatta,

Lindfors,

Kiehlmann

et al. 2020

Preprint

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Context. Identifying the most likely sources for high-energy neutrino emission has been one of the main topics in high-energy astrophysics ever since the first observation of high-energy neutrinos by the IceCube Neutrino Observatory. Active galactic nuclei with relativistic jets, blazars, have been considered to be one of the main candidates due to their ability to accelerate particles to high energies.Aims. We study the connection between radio emission and IceCube neutrino events using data from the Owens Valley Radio Observatory and Metsähovi Radio Observatory blazar monitoring programs. Methods. We identify sources in our radio monitoring sample, which are positionally consistent with IceCube high-energy neutrino events. We estimate their mean flux density and variability amplitudes around the neutrino arrival time, and compare these with values from random samples to establish the significance of our results. Results. We find radio source associations within our samples with 16 high-energy neutrino events detected by IceCube. Nearly half of the associated sources are not detected in the γ-ray energies, but their radio variability properties and Doppler boosting factors are similar to the γ-ray detected objects in our sample so that they could still be potential neutrino emitters. We find that the number of strongly flaring objects in our samples is unlikely to occur due to a random coincidence (at 2σ level), and in the case of OVRO samples, the sample of associated sources is on average at an active state compared to random samples. Conclusions. Based on our results we conclude that although it is clear that not all neutrino events are associated with strong radio flaring blazars, when we see large amplitude radio flares in a blazar at the same time as a neutrino event, it is unlikely to happen by random coincidence.

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Section: Connection With γ-Ray Emissionsupporting

confidence: 87%

Section: Discussioncontrasting

confidence: 46%

Section: Introductionmentioning

confidence: 99%

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Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories

Hovatta,

Lindfors,

Kiehlmann

et al. 2020

Preprint

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“…The coincidence of the two highest energy alerts to date with extended periods of radio emission has led to the speculation that all, 67 or at least some, 68 cosmic neutrinos originate in radio-bright galaxies. The significance of the correlation and its physical origin, if any, 69 are debated.…”

Section: The Blueprint Of the Txs 0506+056 Beam Dump?mentioning

confidence: 99%

The Observation of High-Energy Neutrinos from the Cosmos: Lessons Learned for Multimessenger Astronomy

Halzen

2021

Preprint

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The IceCube neutrino telescope discovered PeV-energy neutrinos originating beyond our Galaxy with an energy flux that is comparable to that of GeV-energy gamma rays and EeV-energy cosmic rays. These neutrinos provide the only unobstructed view of the cosmic accelerators that power the highest energy radiation reaching us from the universe. We will review the results from IceCube's first decade of operations, emphasizing the measurement of the diffuse multiflavored neutrino flux from the universe and the identification of the supermassive black hole TXS 0506+056 as a source of cosmic neutrinos and, therefore, cosmic rays. We will speculate on the lessons learned for multimessenger astronomy, among them that extragalactic neutrino sources may be a relatively small subset of the cosmic accelerators observed in high-energy gamma rays and that these may be gamma-ray-obscured at the times that they emit neutrinos.

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“…[3,4] for reviews. Recent studies indicate [5,6] that the entire astrophysical neutrino flux between 1 TeV and 1 PeV, estimated from muon-track events 1) Corresponding author; e-mail: st@ms2.inr.ac.ru and extrapolated to lower energies as a power law [7], may be associated with radio blazars. However, analyses of cascade events [8] indicate that this extrapolation may underestimate the flux at several tens TeV.…”

mentioning

confidence: 99%

Carpet-2 search for gamma rays above 100 TeV in coincidence with HAWC and IceCube alerts

Dzhappuev,

Afashokov,

Dzaparova

et al. 2020

Preprint

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We report on the search of astrophysical gamma rays with energies in the 100 TeV to several PeV range arriving in directional and temporal coincidence with public alerts from HAWC (TeV gamma rays) and IceCube (neutrinos above ∼ 100 TeV). The observations have been performed with the Carpet-2 air-shower detector at the Baksan Neutrino Observatory, working in the "photon-friendly" mode since 2018. Photon candidate showers are selected by their low muon content. No significant excess of the photon candidates have been observed, and upper limits on gamma-ray fluences associated with the alerts are obtained. For events with good viewing conditions, the Carpet-2 effective area for photons is of the order of the IceCube effective area for neutrinos of the same energy, so the constraints start to probe the production of neutrinos in fast flares of Galactic sources.

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Directional association of TeV to PeV astrophysical neutrinos with radio blazars

Cited by 3 publications

References 51 publications

Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories

Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories

The Observation of High-Energy Neutrinos from the Cosmos: Lessons Learned for Multimessenger Astronomy

Carpet-2 search for gamma rays above 100 TeV in coincidence with HAWC and IceCube alerts

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