| Full text | |
| Author(s): |
Padovani, P.
[1]
;
Giommi, P.
[2, 3, 4]
;
Resconi, E.
[5]
;
Glauch, T.
[5]
;
Arsioli, B.
[6, 7]
;
Sahakyan, N.
[8]
;
Huber, M.
[5]
Total Authors: 7
|
| Affiliation: | [1] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching - Germany
[2] ASI, Via Politecn Snc, I-00133 Rome - Italy
[3] Tech Univ Munich, Inst Adv Studies, Lichtenbergstr 2a, D-85748 Garching - Germany
[4] ICRANet, Piazzale Repubbl 10, I-65122 Pescara - Italy
[5] Tech Univ Munich, Phys Dept, James Frank Str 1, D-85748 Garching - Germany
[6] Univ Estadual Campinas, Inst Fis Gleb Wataghin, R Sergio Buarque de Holanda 777, BR-13083859 Campinas, SP - Brazil
[7] ICRANet Rio, CBPF, Rua Dr Xavier Sigaud 150, BR-22290180 Rio De Janeiro - Brazil
[8] ICRANet Armenia, Marshall Baghramian Ave 24a, Yerevan 0019 - Armenia
Total Affiliations: 8
|
| Document type: | Journal article |
| Source: | Monthly Notices of the Royal Astronomical Society; v. 480, n. 1, p. 192-203, OCT 2018. |
| Web of Science Citations: | 30 |
| Abstract | |
We present the dissection in space, time, and energy of the region around the IceCube-170922A neutrino alert. This study is motivated by: (1) the first association between a neutrino alert and a blazar in a flaring state, TXS 0506+ 056; (2) the evidence of a neutrino flaring activity during 2014-2015 from the same direction; (3) the lack of an accompanying simultaneous gamma-ray enhancement from the same counterpart; (4) the contrasting flaring activity of a neighbouring bright gamma-ray source, the blazar PKS 0502+ 049, during 2014-2015. Our study makes use of multiwavelength archival data accessed through Open Universe tools and includes a new analysis of Fermi-LAT data. We find that PKS 0502+ 049 contaminates the gamma-ray emission region at low energies but TXS 0506+ 056 dominates the sky above a few GeV. TXS 0506+ 056, which is a very strong (top percent) radio and gamma-ray source, is in a high gamma-ray state during the neutrino alert but in a low though hard gamma-ray state in coincidence with the neutrino flare. Both states can be reconciled with the energy associated with the neutrino emission and, in particular during the low/hard state, there is evidence that TXS 0506+ 056 has undergone a hadronic flare with very important implications for blazar modelling. All multimessenger diagnostics reported here support a single coherent picture in which TXS 0506+ 056, a very high energy gamma-ray blazar, is the only counterpart of all the neutrino emissions in the region and therefore the most plausible first non-stellar neutrino and, hence, cosmic ray source. (AU) | |
| FAPESP's process: | 17/00517-4 - Searching for new extragalactic gamma-ray sources in the GeV band aiming to study cross-correlation with astrophysical neutrinos and cosmic rays |
| Grantee: | Bruno Sversut Arsioli |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |