Fermi blazars as candidate neutrino emitters: a study of temporal coincidence with IceCube events

Minutilli, Loreta (2021) Fermi blazars as candidate neutrino emitters: a study of temporal coincidence with IceCube events. [Laurea magistrale], Università di Bologna, Corso di Studio in Astrofisica e cosmologia [LM-DM270]
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Multimessenger astronomy provides a unique tool for exploring the universe at the highest energies: the association between neutrinos and their astrophysical sources would constitute a powerful probe of the high-energy sky. In 2017, the neutrino event IceCube-170922A was found to be coincident in arrival time and direction with an enhanced γ-ray activity from the blazar TXS 0506+056 at redshift z ∼ 0.34, and it was associated to this source at the 3σ confidence level. This discovery motivates further research in the field of the blazar-neutrino connection. In this work, the temporal coincidence between the arrival times of IceCube neutrinos and the γ-ray (0.1 − 300 GeV) emission from a sample of Fermi-detected blazars is investigated. The spatial coincidence for the same sample had been investigated in a previous reference work. Different criteria for the definition of the flaring state of a source were adopted depending on the blazar class (HBL/IBL or LBL) and a subsample of 4 flare-neutrino coincident blazars was selected. A statistical test was performed on each class separately in order to assess the nature of the observed coincidences. An interesting excess was found for the class of HBLs/IBLs while no excess was observed for the LBLs. I discussed the implications of these results for the blazar neutrino connection and the future perspectives for this work.

Tipologia del documento
Tesi di laurea (Laurea magistrale)
Autore della tesi
Minutilli, Loreta
Relatore della tesi
Correlatore della tesi
Corso di studio
Ordinamento Cds
Parole chiave
gamma ray astronomy,neutrinos,blazars,Fermi,IceCube,multimessenger astronomy
Data di discussione della Tesi
12 Marzo 2021

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