1ES 1959+650: Upper limits from a neutrino search with IceCube
ATel #16462; Jessie Thwaites (UW-Madison), Erik Blaufuss (UMD), Marcos Santander (UAlabama), Justin Vandenbroucke (UW-Madison)
on 20 Feb 2024; 17:56 UT
Credential Certification: Marcos Santander (jmsantander@ua.edu)
Subjects: TeV, VHE, Neutrinos, AGN, Blazar
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search for track-like muon neutrino events arriving from the direction of the blazar 1ES 1959+650, which is flaring in the TeV and MeV-GeV gamma-ray bands (LHAASO ATel #16437 and Fermi-LAT ATel #16456, respectively), as well as in soft X-rays (Swift XRT ATel #16449).
The search was conducted in a time window of 36 days (2024-01-15 00:00:00 UTC to 2024-02-20 00:00:00 UTC) during which time IceCube was detecting good quality data. We report a p-value for this search of 1.0, consistent with background expectation.
We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/dE = 1.1 x 10^-1 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 range between 500 GeV to 140 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.
[1] IceCube Collaboration, R. Abbasi et al., ApJ 910 4 (2021)
