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Title: STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?

Abstract

The origin of high-energy neutrinos (0.1–1 PeV range) detected by IceCube remains a mystery. In this work, we explore the possibility that efficient neutrino production can occur in structured jets of BL Lac objects, characterized by a fast inner spine surrounded by a slower layer. This scenario has been widely discussed in the framework of the high-energy emission models for BL Lac objects and radio galaxies. One of the relevant consequences of a velocity structure is the enhancement of the inverse Compton emission caused by the radiative coupling of the two zones. We show that a similar boosting could occur for the neutrino output of the spine through the photo-meson reaction of high-energy protons scattering off the amplified soft target photon field of the layer. Assuming the local density and the cosmological evolution of γ-ray BL Lac object derived from Fermi Large Area Telescope data, we calculate the expected diffuse neutrino intensity, which can match the IceCube data for a reasonable choice of parameters.

Authors:
;  [1];  [2]
  1. INAF-Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate (Italy)
  2. INAF-Osservatorio astronomico di Roma, via Frascati 33, I-00040 Monte Porzio Catone (Italy)
Publication Date:
OSTI Identifier:
22364983
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BL LACERTAE OBJECTS; COSMIC NEUTRINOS; COSMIC PROTONS; COUPLING; GAMMA RADIATION; JETS; LAYERS; MESON REACTIONS; PARTICLE PRODUCTION; PEV RANGE; RADIO GALAXIES; SCATTERING; TELESCOPES; VELOCITY

Citation Formats

Tavecchio, Fabrizio, Ghisellini, Gabriele, and Guetta, Dafne. STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?. United States: N. p., 2014. Web. doi:10.1088/2041-8205/793/1/L18.
Tavecchio, Fabrizio, Ghisellini, Gabriele, & Guetta, Dafne. STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?. United States. doi:10.1088/2041-8205/793/1/L18.
Tavecchio, Fabrizio, Ghisellini, Gabriele, and Guetta, Dafne. Sat . "STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?". United States. doi:10.1088/2041-8205/793/1/L18.
@article{osti_22364983,
title = {STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?},
author = {Tavecchio, Fabrizio and Ghisellini, Gabriele and Guetta, Dafne},
abstractNote = {The origin of high-energy neutrinos (0.1–1 PeV range) detected by IceCube remains a mystery. In this work, we explore the possibility that efficient neutrino production can occur in structured jets of BL Lac objects, characterized by a fast inner spine surrounded by a slower layer. This scenario has been widely discussed in the framework of the high-energy emission models for BL Lac objects and radio galaxies. One of the relevant consequences of a velocity structure is the enhancement of the inverse Compton emission caused by the radiative coupling of the two zones. We show that a similar boosting could occur for the neutrino output of the spine through the photo-meson reaction of high-energy protons scattering off the amplified soft target photon field of the layer. Assuming the local density and the cosmological evolution of γ-ray BL Lac object derived from Fermi Large Area Telescope data, we calculate the expected diffuse neutrino intensity, which can match the IceCube data for a reasonable choice of parameters.},
doi = {10.1088/2041-8205/793/1/L18},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 793,
place = {United States},
year = {2014},
month = {9}
}