A flat-spectrum candidate for a track-type high-energy neutrino emission event, the case of blazar PKS 0723-008

E. Kun, P. L. Biermann, L. Gergely

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4 Citations (Scopus)


By cross-correlating both the Parkes Catalogue and the Second Planck Catalogue of Compact Sources with the arrival direction of the track-type neutrinos detected by the IceCube Neutrino Observatory, we find the flat-spectrum blazar PKS 0723-008 as a good candidate for the high-energy neutrino event 5 (ID5). Apart from its coordinates matching those of ID5, PKS 0723-008 exhibits further interesting radio properties. Its spectrum is flat up to high Planck frequencies, and it produced a fivefold-increased radio flux density through the last decade. Based upon these radio properties we propose a scenario of binary black hole evolution leading to the observed high-energy neutrino emission. The main contributing events are the spin-flip of the dominant black hole, the formation of a new jet with significant particle acceleration and interaction with the surrounding material, with the corresponding increased radio flux. Doppler boosting from the underlying jet pointing to the Earth makes it possible to identify the origin of the neutrinos, so the merger itself is the form of an extended flat-spectrum radio emission, a key selection criterion to find traces of this complex process.

Original languageEnglish
Pages (from-to)L34-L38
JournalMonthly Notices of the Royal Astronomical Society: Letters
Issue number1
Publication statusPublished - Jan 1 2017



  • BL Lacertae objects: Individual: PKS 0723-008
  • Neutrinos

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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