| Issue |
A&A
Volume 687, July 2024
|
|
|---|---|---|
| Article Number | A59 | |
| Number of page(s) | 11 | |
| Section | Extragalactic astronomy | |
| DOI | https://doi.org/10.1051/0004-6361/202449221 | |
| Published online | 27 June 2024 | |
Fermi-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
1
Department of Particle Physics and Astrophysics, Weizmann Institute of Science, 76100 Rehovot, Israel
e-mail: simone.garrappa@gmail.com
2
Fakultät für Physik & Astronomie, Astronomisches Institut (AIRUB), Ruhr-Universität Bochum, 44780 Bochum, Germany
3
Institut für Th. Physik und Astrophysik, University of Würzburg, Emil-Fischer-Str. 31, 97074 Würzburg, Germany
4
Deutsches Elektronen-Synchrotron DESY, Platanenallee 6, 157387 Zeuthen, Germany
5
Finnish Centre for Astronomy with ESO, University of Turku, 20014 Turku, Finland
6
Dipartimento di Fisica, Università di Trento, 38123 Trento, Italy
7
INFN Sezione di Bari, 70125 Bari, Italy
8
Istituto Nazionale di Astrofisica, Istituto di Radioastronomia (IRA), Via Gobetti 101, 40129 Bologna, Italy
9
Dipartimento di Fisica e Astronomia, Università di Bologna, Via Gobetti 93/2, 40129 Bologna, Italy
10
Dipartimento di Fisica, Università di Trieste, INFN, Sezione di Trieste, 34127 Trieste, Italy
11
Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Received:
12
January
2024
Accepted:
26
March
2024
The realtime program for high-energy neutrino track events detected by the IceCube South Pole Neutrino Observatory releases alerts to the astronomical community with the goal of identifying electromagnetic counterparts to astrophysical neutrinos. Gamma-ray observations from the Fermi-Large Area Telescope (LAT) enabled the identification of the flaring gamma-ray blazar TXS 0506+056 as a likely counterpart to the neutrino event IC-170922A. By continuously monitoring the gamma-ray sky, Fermi-LAT plays a key role in the identification of candidate counterparts to realtime neutrino alerts. In this paper, we present the Fermi-LAT strategy for following up high-energy neutrino alerts applied to seven years of IceCube data. Right after receiving an alert, a search is performed in order to identify gamma-ray activity from known and newly detected sources that are positionally consistent with the neutrino localization. In this work, we study the population of blazars found in coincidence with high-energy neutrinos and compare them to the full population of gamma-ray blazars detected by Fermi-LAT. We also evaluate the relationship between the neutrino and gamma-ray luminosities, finding different trends between the two blazar classes BL Lacs and flat-spectrum radio quasars.
Key words: astroparticle physics / neutrinos / galaxies: active / gamma rays: galaxies
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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