3HSP J095507.9+355101: A flaring extreme blazar coincident in space and time with IceCube-200107A

P. Giommi, P. Padovani, F. Oikonomou, T. Glauch, S. Paiano, E. Resconi

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39 Scopus citations

Abstract

The uncertainty region of the highly energetic neutrino IceCube200107A includes 3HSP J095507.9+355101 (z = 0.557), an extreme blazar, which was detected in a high, very hard, and variable X-ray state shortly after the neutrino arrival. Following a detailed multiwavelength investigation, we confirm that the source is a genuine BL Lac. This new detection differs from TXS 0506+056, which is thus far the first source associated with IceCube neutrinos, and is considered a "masquerading"BL Lac. As in the case of TXS 0506+056, 3HSP J095507.9+355101 is also way off the so-called blazar sequence. We consider 3HSP J095507.9+355101 a possible counterpart to the IceCube neutrino. Finally, we discuss some theoretical implications in terms of neutrino production.

Original languageEnglish
Article numberL4
JournalAstronomy and Astrophysics
Volume640
DOIs
StatePublished - 1 Aug 2020

Keywords

  • BL Lacertae objects: general
  • Galaxies: active
  • Gamma rays: galaxies
  • Neutrinos
  • Radiation mechanisms: non-thermal

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