Multi-messenger emission from the parsec-scale jet of the flat-spectrum radio quasar PKS 1502+106 coincident with high-energy neutrino IceCube-190730A

Abstract

On July 30th, 2019 IceCube detected a high-energy astrophysical muon neutrino candidate, IC-190730A, with a $67\%$ probability of astrophysical origin. The flat spectrum radio quasar (FSRQ) PKS 1502+106 is in the error circle of the neutrino. Motivated by this observation, we study PKS 1502+106 as a possible source of IC-190730A. PKS 1502+106 was in a quiet state in terms of UV/optical/X-ray/gamma-ray flux at the time of the neutrino alert, we therefore model the expected neutrino emission from the source during its average long-term state, and investigate whether the emission of IC-190730A as a result of the quiet long-term emission of PKS 1502+106 is plausible. We analyse UV/optical and X-ray data and collect additional observations from the literature to construct the multi-wavelength spectral energy distribution of PKS 1502+106. We perform leptohadronic modelling of the multi-wavelength emission of the source and determine the most plausible emission scenarios and the maximum expected accompanying neutrino flux. A model in which the multi-wavelength emission of PKS 1502+106 originates beyond the broad-line region and inside the dust torus is most consistent with the observations. In this scenario, PKS 1502+106 can have produced up to of order one muon neutrino with energy exceeding 100 TeV in the lifetime of IceCube. An appealing feature of this model is that the required proton luminosity is consistent with the average required proton luminosity if blazars power the observed ultra-high-energy-cosmic-ray flux and well below the source's Eddington luminosity. If such a model is ubiquitous among FSRQs, additional neutrinos can be expected from other bright sources with energy $\gtrsim 10$ PeV.

18 pages, 9 figures, published in JCAP

References in corpus (24)

• HI4PI: A full-sky HI survey based on EBHIS and GASS
• An online repository of Swift/XRT light curves of GRBs
• IceCube-Gen2: The Window to the Extreme Universe
• The blazar sequence: a new perspective
• Characteristics of the diffuse astrophysical electron and tau neutrino flux with six years of IceCube high energy cascade data
• The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux
• Constraining High-Energy Cosmic Neutrino Sources: Implications and Prospects
• Photohadronic origin of $\gamma$-ray BL Lac emission: implications for IceCube neutrinos
• Time-Integrated Searches for Point-like Sources of Neutrinos with the 40-String IceCube Detector
• Detection of significant cm to sub-mm band radio and gamma-ray correlated variability in Fermi bright blazars
• Time-correlation between the radio and gamma-ray activity in blazars and the production site of the gamma-ray emission
• Are both BL Lacs and pulsar wind nebulae the astrophysical counterparts of IceCube neutrino events?
• A Comprehensive Approach to Tau-Lepton Production by High-Energy Tau Neutrinos Propagating Through Earth
• Association of IceCube neutrinos with radio sources observed at Owens Valley and Metsähovi Radio Observatories
• Multi-wavelength and neutrino emission from blazar PKS 1502+106
• A Neutral Beam Model for High-Energy Neutrino Emission from the Blazar TXS 0506+056
• Discerning the $\gamma$-ray emitting region in the flat spectrum radio quasars
• Comprehensive Multimessenger Modeling of the Extreme Blazar 3HSP J095507.9+355101 and Predictions for IceCube
• Cosmic neutrinos from temporarily gamma-suppressed blazars
• A ring accelerator? Unusual jet dynamics in the IceCube candidate PKS 1502+106
• Locating the gamma-ray emission region in the brightest Fermi-LAT Flat Spectrum Radio Quasars
• IceCube Sensitivity for Neutrino Flux from Fermi Blazars in Quiescent States
• Curvature induced polarization and spectral index behavior for PKS 1502+106
• EeV Astrophysical neutrinos from FSRQs?