Abstract
On MJD 58018 the IceCube neutrino observatory detected a highlyenergetic, well-reconstructed neutrino, IceCube-170922A, at a distance of 0:1° to a γ-ray flaring blazar, TXS 0506+056. Follow-up searches in archival data additionally revealed a larger flare of neutrinos from the same direction. In order to complete the picture we present here a full multi-wavelength study of the region around IceCube-170922A. While we identify also other non-thermal counterpart candidates, we show that all the evidence points to TXS 0506+056 as the dominant neutrino emitter. Additionally, an analysis of all the available Fermi-LAT data indicates a hard spectrum/low flux of TXS 0506+056 during the neutrino flare in contrast to a soft spectrum/high flux at the arrival time of IceCube-170922A. Putting all the pieces together we conclude that the SED of TXS 0506+056 can be energetically reconnected for both neutrino observations.
Highlights
The IceCube Neutrino Observatory has recently found evidence for an astrophysical neutrino flux above ∼ 100 TeV [1]
Despite TXS 0506+056 we identified another known γ-ray source, PKS 0502+049, as well as five non-thermal objects in the vicinity of IceCube-170922A
The γ-ray spectra of TXS 0506+056 during both neutrino emission periods are well consistent with the flux level observed in neutrinos
Summary
The IceCube Neutrino Observatory has recently found evidence for an astrophysical neutrino flux above ∼ 100 TeV [1]. Searches in archival IceCube data revealed a flare of neutrinos during a 5-month period in 2014-2015 1 spatially consistent with the neutrino alert. The fluence of this flare is 2.1+−00..97 × 10−4 TeV cm−2, which results in a post-trial significance of 3.5σ [6]. Despite TXS 0506+056 we identified another known γ-ray source, PKS 0502+049, as well as five non-thermal objects in the vicinity of IceCube-170922A. Based on their radio to X-ray emission ratio a prior all of them are good counterpart candidates. All available astronomical data are collected and analyzed in order to identify and characterize the neutrino’s multi-wavelength counterpart(s) over the entire energy spectrum
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