scholarly journals Testing high energy neutrino emission from the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) sources.

2021 ◽  
Author(s):  
Antonio Galván ◽  
Nissim Fraija ◽  
Edilberto Aguilar-Ruiz ◽  
Jagdish C. Joshi ◽  
Jose Antonio de Diego Onsurbe ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Neutrino Emission ◽  
Large Area ◽  
High Energy Neutrino ◽  
Space Telescope ◽  
Energy Neutrino

scholarly journals Flaring Rate Distribution of Gamma-Ray Blazars and Implications for High-Energy Neutrino Emission

2019 ◽  
Author(s):  
Kenji Yoshida ◽  
Maria Petropoulou ◽  
Meg Urry ◽  
Paolo Coppi ◽  
Charles Bailyn ◽  
...  
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Neutrino Emission ◽  
High Energy Neutrino ◽  
Rate Distribution ◽  
Energy Neutrino

scholarly journals Detection of a flaring blazar coincident with an IceCube high-energy neutrino

2019 ◽  
Vol 207 ◽  
pp. 02001
Author(s):  
Anna Franckowiak
Keyword(s):  
Gamma Ray ◽  
Spectral Energy Distribution ◽  
Neutrino Flux ◽  
High Energy ◽  
Spectral Energy ◽  
Large Area ◽  
High Energy Neutrino ◽  
Energy Neutrino ◽  
Radio Wavelength ◽  
First Time

In September 22, 2017, IceCube released a public alert announcing the detection of a 290 TeV neutrino track event with an angular uncertainty of one square degree (90% containment). A multi-messenger follow-up campaign was initiated resulting in the detection of a GeV gamma-ray flare by the Fermi Large Area Telescope positionally consistent with the location of the known Bl Lac object, TXS 0506+056 , located only 0.1 degrees from the best-fit neutrino position. The probability of finding a GeV gamma-ray flare in coincidence with a high-energy neutrino event assuming a correlation of the neutrino flux with the gamma-ray energy flux in the energy band between 1 and 100 GeV was calculated to be 3σ (after trials correction). Following the detection of the flaring blazar the imaging air Cherenkov telescope MAGIC detected the source for the first time in the > 100 GeV gamma-ray band. The activity of the source was confirmed in X-ray, optical and radio wavelength. Several groups have developed lepto-hadronic models which succeed to explain the multi-messenger spectral energy distribution.

scholarly journals Neutrino emission from the direction of the blazar TXS 0506+056 prior to the IceCube-170922A alert

Science ◽  
2018 ◽  
Vol 361 (6398) ◽  
pp. 147-151 ◽  
Author(s):  
◽  
Mark Aartsen ◽  
Markus Ackermann ◽  
Jenni Adams ◽  
Juan Antonio Aguilar ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Neutrino Flux ◽  
High Energy ◽  
Time Variable ◽  
Neutrino Emission ◽  
High Energy Neutrino ◽  
Excess Emission ◽  
Energy Neutrino ◽  
Variable Flux ◽  
Astrophysical Neutrino

A high-energy neutrino event detected by IceCube on 22 September 2017 was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. Prompted by this association, we investigated 9.5 years of IceCube neutrino observations to search for excess emission at the position of the blazar. We found an excess of high-energy neutrino events, with respect to atmospheric backgrounds, at that position between September 2014 and March 2015. Allowing for time-variable flux, this constitutes 3.5σ evidence for neutrino emission from the direction of TXS 0506+056, independent of and prior to the 2017 flaring episode. This suggests that blazars are identifiable sources of the high-energy astrophysical neutrino flux.

scholarly journals Neutrinos from TXS 0506+056 prior to the 2017 gamma-ray flare

2019 ◽  
Vol 207 ◽  
pp. 02002
Author(s):  
Chad Finley
Keyword(s):  
Gamma Ray ◽  
High Energy ◽  
Neutrino Emission ◽  
High Energy Neutrino ◽  
Neutrino Event ◽  
Energy Neutrino

On 2017 September 22, IceCube released a public alert announcing the detection of a well-reconstructed, high-energy neutrino event. Such alerts issued through the Extremely High Energy (EHE) alert stream occur roughly four times a year. Subsequent multimessenger follow-up identified that the event was coincident in direction and time with a gamma-ray flare from the blazar TXS 0506+056. This association prompted an archival analysis searching for additional neutrinos from the direction of TXS 0506+056 using 9.5 years of IceCube neutrino observations. An excess of neutrino events with respect to atmospheric backgrounds was found between September 2014 and March 2015. The analysis yields 3:5σ evidence for neutrino emission from the direction of TXS 0506+056, independent of and prior to the 2017 emission.

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