TY - JOUR
T1 - STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES?
T2 - Efficient PeV neutrino factories?
AU - Tavecchio, Fabrizio
AU - Ghisellini, Gabriele
AU - Guetta, Dafne
N1 - Publisher Copyright:
© 2014. The American Astronomical Society. All rights reserved. Printed in the U.S.A.
PY - 2014/9/20
Y1 - 2014/9/20
N2 - 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.
AB - 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.
KW - BL Lacertae objects: general
KW - gamma rays: galaxies
KW - neutrinos
UR - http://www.scopus.com/inward/record.url?scp=84914124399&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/793/1/L18
DO - 10.1088/2041-8205/793/1/L18
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SN - 2041-8205
VL - 793
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L18
ER -