  In ten years of observations, the IceCube neutrino observatory has revealed a
neutrino sky in tension with previous expectations for neutrino point source
emissions. Astrophysical objects associated with hadronic processes might act
as production sites for neutrinos, observed as point sources at Earth. Instead,
a nearly isotropic flux of astrophysical neutrinos is observed up to PeV
energies, prompting a reassessment of the assumed transport and production
physics. This work applies a new physical explanation for neutrino production
from populations of active galactic nuclei (AGN) and starburst galaxies to
three years of public IceCube point source data. Specifically, cosmic rays
(CRs) produced at such sources might interact with extragalactic background
light and gas along the line of sight, generating a secondary neutrino flux.
This model is tested alongside a number of typical flux weighting schemes, in
all cases the all-sky flux contribution being constrained to percent levels of
the reported IceCube diffuse astrophysical flux.
