NLSy1 1H0323+342: Upper limits from a neutrino search with IceCube
ATel #17423; Alicia Mand (University of Wisconsin-Madison), Erik Blaufuss (University of Maryland)
on 26 Sep 2025; 20:30 UT
Credential Certification: Erik Blaufuss (blaufuss@umd.edu)
Subjects: TeV, Neutrinos, AGN
The IceCube Collaboration (http://icecube.wisc.edu/) reports:
IceCube has performed a search [1] for track-like muon neutrino events arriving from the direction of the flaring radio-loud narrow-line Seyfert 1 1H 0323+342, also known as 4FGL J0324.8+3412 detected by Fermi-LAT (ATel #17407) and Swift (ATeL #17411). For this search we used a time window of (2025-09-20 00:00:00.000 to 2025-09-24 23:59:59.000) during which IceCube was collecting good quality data. We report a p-value of 1.0, consistent with background expectation.
We accordingly derive a time-integrated muon-neutrino flux upper limit for this source with an E^-2.0 spectrum, expressed as E^2 dN/dE evaluated at 1 TeV = 5.3e-02 GeV cm^-2. 90% of events IceCube would detect from a source at this declination with an E^-2.0 spectrum have energies in the approximate energy range between 7e+02 and 5e+05 GeV.
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)
