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γ-Ray Emission from Classical Nova V392 Per: Measurements from Fermi and HAWC
Ist Teil von
The Astrophysical journal, 2022-12, Vol.940 (2), p.141
Ort / Verlag
Philadelphia: The American Astronomical Society
Erscheinungsjahr
2022
Link zum Volltext
Quelle
EZB-FREE-00999 freely available EZB journals
Beschreibungen/Notizen
Abstract
This paper reports on the
γ
-ray properties of the 2018 Galactic nova V392 Per, spanning photon energies ∼0.1 GeV–100 TeV by combining observations from the Fermi Gamma-ray Space Telescope and the HAWC Observatory. As one of the most rapidly evolving
γ
-ray signals yet observed for a nova, GeV
γ
-rays with a power-law spectrum with an index Γ = 2.0 ± 0.1 were detected over 8 days following V392 Per’s optical maximum. HAWC observations constrain the TeV
γ
-ray signal during this time and also before and after. We observe no statistically significant evidence of TeV
γ
-ray emission from V392 Per, but present flux limits. Tests disfavor the extension of the Fermi Large Area Telescope spectrum to energies above 5 TeV by 2 standard deviations (95%) or more. We fit V392 Per’s GeV
γ
-rays with hadronic acceleration models, incorporating optical observations, and compare the calculations with HAWC limits.