Ionisation as indicator for cosmic ray acceleration

Abstract. Astrospheres and wind bubbles of massive stars are believed to be sources of cosmic rays with energies E ≲ 1 TeV. These particles are not directly detectable, but their impact on surrounding matter, in particular ionisation of atomic and molecular hydrogen, can lead to observable signatures. A correlation study of both gamma ray emission, induced by proton-proton interactions of cosmic ray protons with kinetic energies E_p ≥ 280 MeV with ambient hydrogen, and ionisation induced by cosmic ray protons of kinetic energies E_p < 280 MeV can be performed in order to study potential sources of (sub)TeV cosmic rays.