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Latest from IceCube: “Evidence of Cosmic Neutrinos from a Blazar”

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Time:

Thursday, 01. Nov. 2018

Video-Recording for any system with MP4-support

- Video.mp4 (ca.446 Mb)

15:15 – 16:15

Chad Finley

(Stockholm University)

Abstract :

The IceCube Neutrino Observatory instruments one cubic kilometer of ice deep within

the glacier at the South Pole, Antarctica. Completed in 2011, IceCube announced the

first detection of cosmic neutrinos in 2013. These neutrinos, with energies from 10 TeV

to beyond 1 PeV, appear to arrive isotropically across the sky, with their origins having

remained unknown so far. This summer IceCube presented the first evidence of a

cosmic source of such high-energy neutrinos. A rare, high-energy neutrino event detected

on 2017 Sept. 22 was reported by IceCube in a public alert that led to extensive follow-up

observations across the electromagnetic spectrum. A tantalizing association was found

with a flaring blazar, an active galaxy where one of the jets from the central black hole is

pointed in our direction. Subsequent analysis of archival IceCube data revealed further

evidence that the blazar had a previous episode of neutrino emission.

These results may for the first time identify a long-sought accelerator of high-energy

cosmic rays.