High-energy neutrinos from X-rays flares of blazars frequently observed by the Swift X-Ray Telescope

Abstract

Blazar flares have been suggested as ideal candidates for enhanced neutrino production. While the neutrino signal of $\gamma$-ray flares has been widely discussed, the neutrino yield of X-ray flares has received less attention. Here, we compute the predicted neutrino signal from X-ray flares detected in 66 blazars observed more than 50 times with the X-ray Telescope (XRT) on board the Neil Gehrels Swift Observatory. We consider a scenario where X-ray flares are powered by synchrotron radiation of relativistic protons, and neutrinos are produced through photomeson interactions between protons with their own synchrotron X-ray photons. Using the 1 keV X-ray light curves for flare identification, the 0.5-10 keV fluence of each flare as a proxy for the all-flavour neutrino fluence, and the IceCube point-source effective area for different detector configurations, we calculate the number of muon and antimuon neutrinos above 100 TeV expected for IceCube from each flaring source. The bulk of the neutrino events from the sample originates from flares with durations $\sim 1-10$ d. Accounting for the X-ray flare duty cycle of the sources in the sample, which ranges between $\sim 2$ and 24 per cent, we compute an average yearly neutrino rate for each source. The median of the distribution (in logarithm) is $\sim 0.03$ yr${}^{-1}$, with Mkn 421 having the highest predicted rate $1.2\pm 0.3$ yr${}^{-1}$, followed by 3C 273 $(0.33\pm 0.03$ yr${}^{-1})$ and PG 1553+113 ($0.25\pm 0.02$ yr${}^{-1}$). Next-generation neutrino detectors together with regular X-ray monitoring of blazars could constrain the duty cycle of hadronic X-ray flares.

17 pages, 16 figures, Accepted for publication in MNRAS

References in corpus (19)

• Calculation of atmospheric neutrino flux using the interaction model calibrated with atmospheric muon data
• Time-integrated Neutrino Source Searches with 10 years of IceCube Data
• The 5th edition of the Roma-BZCAT. A short presentation
• Constraining High-Energy Cosmic Neutrino Sources: Implications and Prospects
• The Pacific Ocean Neutrino Experiment
• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
• Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?
• The Central Engines of Fermi Blazars
• Astrophysical Sources of High Energy Neutrinos in the IceCube Era
• Structured jets in BL Lac objects: efficient PeV neutrino factories?
• A Neutral Beam Model for High-Energy Neutrino Emission from the Blazar TXS 0506+056
• IceCube Data for Neutrino Point-Source Searches Years 2008-2018
• The BH mass of nearby QSOs: a comparison of the bulge luminosity and virial methods
• Proton Synchrotron $\gamma$-rays and the Energy Crisis in Blazars
• Revisiting AGN as the Source of IceCube's Diffuse Neutrino Flux
• Redshift determination of the BL Lac object 3C66A by the detection of its host galaxy cluster at $z=0.340$
• The strange case of the transient HBL blazar 4FGL J1544.3-0649
• Hadronic X-ray Flares from Blazars

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