Analysis of Fermi-LAT observations, UHECRs and neutrinos from the radio galaxy Centaurus B
Por:
Fraija, N., Araya, M., Galvan-Gamez, A., de Diego, J. A.
Publicada:
1 ago 2019
Categoría:
Astronomy and astrophysics
Resumen:
Centaurus B (Cen B) is one of the closest and brightest radio-loud
galaxy in the southern sky. This radio galaxy, proposed as a plausible
candidate for accelerating ultra-high-energy cosmic rays (UHECRs), is
near the highest-energy neutrino event reported (IC35) in the
High-Energy Starting Events catalog. Pierre Auger observatory reported
the highest energy comic rays during 10 years of collecting data with
some of them around this source. In this paper, the analysis of the
gamma-ray spectrum and the light curve above 200 MeV is presented with
nine years of cumulative Fermi-LAT data around Cen B. Taking into
consideration the multi-wavelength observations carried out about this
radio galaxy, leptonic and hadronic scenarios are introduced in order to
fit the spectral energy distribution, assuming that the gamma-ray flux
is produced in a region close to the core and in the extended lobes.
Using the best-fit values found, several physics properties of this
radio galaxy are derived. Furthermore, a statistical analysis of the
cosmic ray distribution around Cen B is performed, finding that this
distribution is not different from the background at a level of
significance of 5%. Considering the UHECR event associated to this
source by Moskalenko et al. [1] and extrapolating its luminosity to
low energies, we do not find enough evidence to associate the
highest-energy neutrino event (IC35) with this radio galaxy.
Filiaciones:
Fraija, N.:
Univ Nacl Autonoma Mexico, Inst Astron, A Postal 70-264, Mexico City 04510, DF, Mexico
Araya, M.:
Univ Costa Rica, Escuela Fis, San Jose 2060, Costa Rica
Univ Costa Rica, Ctr Invest Espaciales CINESPA, San Jose 2060, Costa Rica
Galvan-Gamez, A.:
Univ Nacl Autonoma Mexico, Inst Astron, A Postal 70-264, Mexico City 04510, DF, Mexico
de Diego, J. A.:
Univ Nacl Autonoma Mexico, Inst Astron, A Postal 70-264, Mexico City 04510, DF, Mexico
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