High-energy neutrino-induced cascade from the direction of the flaring radio blazar TXS 0506+056 observed by the Baikal Gigaton Volume Detector in 2021

Collaboration, Baikal-GVD; Erkenov, A. K.; Kosogorov, N. A.; Kovalev, Y. A.; Kovalev, Y. Y.; Plavin, A. V.; Popkov, A. V.; Pushkarev, A. B.; V., Semikoz, D.; Sotnikova, Yu. V.; Troitsky, S. V.

doi:10.48550/arxiv.2210.01650

Cited by 6 publications

(2 citation statements)

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“…Bottom: RATAN-600 light curve at 11 GHz. The radio light curve is decomposed of three radio flares depicted by the blue dashed lines, the sum of which is represented by a blue thick line [23]. The vertical lines denote the times of neutrino arrival [6,23].…”

Section: Figurementioning

confidence: 99%

Probing Neutrino Production in Blazars by Millimeter VLBI

et al. 2023

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The advancement of neutrino observatories has sparked a surge in multi-messenger astronomy. Multiple neutrino associations among blazars are reported while neutrino production sites are located within their central (sub)parsecs. Yet, many questions remain on the nature of those processes. The next generation Event Horizon Telescope (ngEHT) is uniquely positioned for these studies, as its high frequency and resolution can probe both the accretion disk region and the parsec-scale jet. This opens up new opportunities for connecting the two regions and unraveling the proton acceleration and neutrino production in blazars. We outline observational strategies for ngEHT and highlight what it can contribute to the multi-messenger study of blazars.

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Section: Figurementioning

confidence: 99%

Probing Neutrino Production in Blazars by Millimeter VLBI

et al. 2023

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“…Mounting evidence indicates the presence of high-energy neutrinos arriving from blazars, as seen by all neutrino observatories [e.g. [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Blazars: from radio waves to high-energy neutrinos

Plavin¹,

Kovalev²,

Kovalev³

et al. 2023

Proceedings of 38th International Cosmic Ray Conference — PoS(ICRC2023)

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Blazars are studied through multimessenger eyes over a wide energy spectrum, from radio waves to TeV and PeV neutrinos. We present complete-sample statistical analyses, and demonstrate that very long baseline radio interferometry is uniquely positioned in the multimessenger space. Its high resolution selects beamed parsec-scale synchrotron emission, and neutrinos are likely to experience comparable beaming effects. Evidence for this connection is provided by directional and temporal correlations. We provide new insights on neutrino production in blazars motivated by our recent observational findings.

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MOJAVE – XX. Persistent linear polarization structure in parsec-scale AGN jets

Pushkarev

Aller

et al. 2023

Monthly Notices of the Royal Astronomical Society

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We analysed the parsec-scale linear polarization properties of 436 active galactic nuclei (AGN) based on 15 GHz polarimetric Very Long Baseline Array (VLBA) observations. We present polarization and total intensity images averaged over at least five epochs since 1996 January 19 through 2019 August 4. Stacking improves the image sensitivity down to ∼30 μJy beam−1 and effectively fills out the jet cross-section both in total intensity and linear polarization. It delineates the long-term persistent magnetic field configuration and its regularity by restoring spatial distributions of the electric vector position angle (EVPA) and fractional polarization, respectively. On average, about ten years of stacking period is needed to reveal the stable and most-complete polarization distribution of a source. We find that the degree of polarization significantly increases down and across the jet towards its edges, typically manifesting U or W-shaped transverse profiles, suggesting a presence of a large-scale helical magnetic field associated with the outflow. In some AGN jets, mainly BL Lacs, we detect quasi-constant fractional polarization profiles across the jet, accompanied by EVPAs that closely follow the outflow. BL Lacs show higher fractional polarization values in their cores and jets than those in quasars up to hectoparsec de-projected scales, while on larger scales, they become comparable. High-synchrotron-peaked BL Lac jets are found to be less polarized than intermediate and low-synchrotron-peaked BL Lacs. The spatial distribution of the EVPAs in BL Lacs tend to align with the local jet direction, while quasars show an excess of orthogonal polarization orientation.

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High-energy neutrino-induced cascade from the direction of the flaring radio blazar TXS 0506+056 observed by the Baikal Gigaton Volume Detector in 2021

Cited by 6 publications

References 0 publications

Probing Neutrino Production in Blazars by Millimeter VLBI

Probing Neutrino Production in Blazars by Millimeter VLBI

Blazars: from radio waves to high-energy neutrinos

MOJAVE – XX. Persistent linear polarization structure in parsec-scale AGN jets

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