  Ultrahigh-energy cosmic rays passing through the central region of the Galaxy
interact with starlight and the infrared photons. Both nuclei and protons
generate secondary fluxes of photons and neutrinos on their passage through the
central region. We compute the fluxes of these secondary particles, the
observations of which can be used to improve one's understanding of origin and
composition of ultrahigh-energy comic rays, especially if the violation of the
Greisen--Zatespin--Kuzmin cutoff is confirmed by the future data.
