Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 480, Issue 1, Pages 192-203Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1852
Keywords
neutrinos; radiation mechanisms: non-thermal; galaxies: active; BL Lacertae objects: general; gamma-rays: galaxies
Categories
Funding
- Technische Universitat Munchen - Institute for Advanced Studies - German Excellence Initiative (European Union Seventh Framework Programme) [291763]
- Sao Paulo Research Foundation (FAPESP) [2017/00517-4]
- Deutsche Forschungsgemeinschaft [SFB 1258]
- NASA [NNX08AW31G, NNX11A043G, NNX14AQ89G]
- NSF [AST-0808050, AST-1109911]
- Istituto Nazionale di Astrofisica in Italy
- Centre National d' Etudes Spatiales in France
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [17/00517-4] Funding Source: FAPESP
Ask authors/readers for more resources
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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available