Are blazars neutrino countrparts?
IceCube has detected astrophysical PeV neutrinos. The problem in identifying counterparts: their large positional uncertainty radius of ~10 degrees.
The Galactic plane as seen in γ rays
IceCube event E14
IC-14 with its 13.2 degrees uncertainty region marked in white. 3 TANAMI blazars are found within this region.
IceCube event E20
IC-20 with its 10.7 degrees uncertainty region marked in white. It is also consistent with 3 TANAMI blazars.
Show neutrino regions for the 2 IceCube events
Are blazars possible counterparts to PeV neutrino events?
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Blazars are possible counterparts to high-energy neutrinos. Other candidates include Gamma-ray bursts, radio galaxies and starburst galaxies.
In this study, the focus was not to identify a counterpart, but to find out whether the neutrino flux from blazar would be compatible.
TANAMI VLBI data
This data is the 8.4 (X) and 22.3 GHz (K-band) data taken within the TANAMI framework. The fluxes are core fluxes, excluding radio emission from the outer jet.
The uncertainties are conservative estimates and include systematic uncertainties.
Big Blue Bump
The thermal emission in the Optical/UV is thought to come from the accretion disk. This source shows a particularly strong thermal emission peak.
The high-energy hump
The origin of the high-energy emission (~X-ray to gamma-rays is unclear.
It can originate from a purely leptonic scenario or be a combination of hadronic and leptonic emission.
The high-energy peak is particularly bright in this source (z = 2.4), making it one of the few blazars with a BAT and INTEGRAL spectrum.
We use multiwavelength SEDs to characterize the electromagnetic emission of the blazars that are consistent with IceCube neutrino events.
What were the results of our study?
