A two-zone model for blazar emission: implications for TXS 0506+056 and the neutrino event IceCube-170922A
| Autor: | Xue, Rui, Liu, Ruo-Yu, Petropoulou, Maria, Oikonomou, Foteini, Wang, Ze-Rui, Wang, Kai, Wang, Xiang-Yu |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| ISSN: | 1538-4357 |
| DOI: | 10.3204/pubdb-2020-00252 |
| Popis: | The astrophysical journal / 1 Part 1 886(1), 23 - (2019). doi:10.3847/1538-4357/ab4b44 A high-energy muon neutrino event, IceCube-170922A, was recently discovered in both spatial and temporal coincidence with a gamma-ray flare of the blazar TXS 0506+056. It has been shown, with standard one-zone models, that neutrinos can be produced in the blazar jet via hadronic interactions, but with a flux which is mostly limited by the X-ray data. In this work, we explore the neutrino production from TXS 0506+056 by invoking two physically distinct emission zones in the jet, separated by the broad line region (BLR). Using the Doppler-boosted radiation of the BLR as the target photon field, the inner zone accounts for the neutrino and gamma-ray emission via $p\gamma$ interactions and inverse Compton scattering respectively, while the outer zone produces the optical and X-ray emission via synchrotron and synchrotron self-Compton processes. The different conditions of the two zones allow us to suppress the X-ray emission from the electromagnetic cascade, and set a much higher upper limit on the muon neutrino flux (i.e., $\sim 10^{-11}\rm erg~cm^{-2}s^{-1}$) than in one-zone models. We compare, in detail, our scenario with one-zone models discussed in the literature, and argue that differentiating between such scenarios will become possible with next generation neutrino telescopes, such as IceCube-Gen2. Published by Institute of Physics Publ., London |
| Databáze: | OpenAIRE |
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