NGC 1275: Upper limits from a neutrino search with IceCube
ATel #15852; Sam Hori for the IceCube collaboration
on 8 Jan 2023; 19:06 UT
Credential Certification: Abhishek Desai (desai25@wisc.edu)
Subjects: Neutrinos, AGN, Transient
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for track-like muon neutrino events arriving from the direction of NGC 1275 during a period of high VHE gamma-ray emission observed by LST-1, MAGIC and MACE (ATels #15819, #15820, and #15823, respectively).
The search was performed using a time window of 8 days (2022-12-16 12:00:00.0 UTC to 2022-12-24 12:00:00.0 UTC), during which IceCube was collecting good quality data. We find that the data are consistent with atmospheric background expectations, with a p-value of 1. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/dE = 7.0 x 10^-2 GeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum have energies in the approximate energy range between 650 GeV to 350 TeV.
The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu.