Search for synchrotron emission from secondary electrons of proton-proton interaction in Galactic PeVatron candidate HESS J1641-463
arxiv(2024)
摘要
HESS J1641-463 is an unidentified gamma-ray source with a hard TeV gamma-ray
spectrum, and thus it has been proposed to be a possible candidate for cosmic
ray (CR) accelerators up to PeV energies (a PeVatron candidate). The source
spatially coincides with the radio supernova remnant (SNR) G338.5+0.1, but has
not yet been fully explored in the X-ray band. We analyzed newly taken NuSTAR
data, pointing at HESS J1641-463, with 82 ks effective exposure time. There is
no apparent X-ray counterpart of HESS J1641-463, while nearby stellar cluster,
Mercer 81, and stray-light X-rays are detected. Combined with the archival
Chandra data, partially covering the source, we derived an upper limit of ∼
6× 10^-13 erg cm^-2 s^-1 in 2-10 keV (∼ 3× 10^-13
erg cm^-2 s^-1 in 10-20 keV). If the gamma-ray emission is originated
from decay of π^0 mesons produced in interactions between CR protons and
ambient materials, secondary electrons in the proton-proton interactions can
potentially emit synchrotron photons in the X-ray band, which can be tested by
our X-ray observations. Although the obtained X-ray upper limits cannot place a
constraint on the primary proton spectrum, it will be possible with a future
hard X-ray mission.
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