RT Journal Article
T1 Constraints on gamma-ray and neutrino emission from NGC 1068  with the MAGIC Telescopes
A1 Acciari, Victor
A1 López Coto, Ruben
A1 Morcuende Parrilla, Daniel
A1 Barrio Uña, Juan Abel
A1 Contreras González, José Luis
A1 Fonseca González, María Victoria
A1 López Moya, Marcos
A1 Peñil Del Campo, Pablo
A1 Rephaeli, Yoel
AB Starburst galaxies and star-forming active galactic nuclei are among the candidate sources thought to contribute appreciably to the extragalactic gamma-ray and neutrino backgrounds. NGC 1068 is the brightest of the star-forming galaxies found to emit gamma-rays from 0.1 to 50 GeV. Precise measurements of the high-energy spectrum are crucial to study the particle accelerators and probe the dominant emission mechanisms. We have carried out 125 hr of observations of NGC 1068 with the MAGIC telescopes in order to search for gamma-ray emission in the very- high-energy band. We did not detect significant gamma-ray emission, and set upper limits at the 95% confidence level to the gamma-ray flux above 200 GeV f < 5.1 × 10^(−13) cm^(−2) s^(−1). This limit improves previous constraints by about an order of magnitude and allows us to put tight constraints on the theoretical models for the gamma-ray emission. By combining the MAGIC observations with the Fermi-LAT spectrum we limit the parameter space (spectral slope, maximum energy) of the cosmic ray protons predicted by hadronuclear models for the gamma-ray emission, while we find that a model postulating leptonic emission from a semi-relativistic jet is fully consistent with the limits. We provide predictions for IceCube detection of the neutrino signal foreseen in the hadronic scenario. We predict a maximal IceCube neutrino event rate of 0.07 yr^(−1).
PB IOP Publishing
SN 0004-637X
YR 2019
FD 2019
LK https://hdl.handle.net/20.500.14352/88572
UL https://hdl.handle.net/20.500.14352/88572
LA eng
NO Artículo firmado por 174 autores.
NO Bundesministerium für Bildung und Forschung (Alemania)
NO Max Planck Society
NO Istituto Nazionale di Fisica Nucleare (Italia)
NO Istituto Nazionale Astrofisica (Italia)
NO Swiss National Science Foundation
NO Ministerio de Economía, Comercio y Empresa (España)
NO Ministry of Education and Science (Bulgaria)
NO Academy of Finland
NO Ministerio de Ciencia e Innovación (España) 
NO Croatian Science Foundation
NO University of Rijeka
NO Deutsche Forschungsgemeinschaft
NO Polish National Research Centre
NO Ministério da Ciência, Tecnologia e Inovações (Brasil)
NO Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (Brasil)
NO Fundaçao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio De Janeiro
DS Docta Complutense
RD 12 abr 2025