Mon. Not. R. Astron. Soc., 480, 192-203 (2018/October-2)
Dissecting the region around IceCube-170922A: the blazar TXS 0506+056 as the first cosmic neutrino source.
PADOVANI P., GIOMMI P., RESCONI E., GLAUCH T., ARSIOLI B., SAHAKYAN N. and HUBER M.
Abstract (from CDS):
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 γ-ray enhancement from the same counterpart; (4) the contrasting flaring activity of a neighbouring bright γ-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 γ-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 γ-ray source, is in a high γ-ray state during the neutrino alert but in a low though hard γ-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 γ-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.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
neutrinos - radiation mechanisms: non-thermal - galaxies: active - BL Lacertae objects: general - gamma-rays: galaxies
View the reference in ADS
To bookmark this query, right click on this link: simbad:2018MNRAS.480..192P and select 'bookmark this link' or equivalent in the popup menu