STRUCTURED JETS IN BL LAC OBJECTS: EFFICIENT PeV NEUTRINO FACTORIES? Efficient PeV neutrino factories?

Fabrizio Tavecchio, Gabriele Ghisellini, Dafne Guetta

Research output: Contribution to journalArticlepeer-review

68 Scopus citations

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.

Original languageEnglish
Article numberL18
JournalAstrophysical Journal Letters
Volume793
Issue number1
DOIs
StatePublished - 20 Sep 2014
Externally publishedYes

Keywords

  • BL Lacertae objects: general
  • gamma rays: galaxies
  • neutrinos

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