Temperature spectra of interstellar dust grains heated by cosmic-rays
  II: dark cloud cores
  Cosmic-ray (CR) induced heating of whole interstellar grains is an important
desorption mechanism for grain surface molecules in interstellar molecular
clouds. This study aims to provide a detailed temperature spectra for such
CR-induced heating. For this, olivine grains with radius of 0.05, 0.1 and 0.2
microns shielded by interstellar gas with isotropic column densities
characteristic to dark cores were considered. The accumulation of an ice mantle
of increasing thickness was taken into account. The CR energy spectra was
obtained for these column densities for 32 cosmic-ray constituents. We
calculated the frequencies with which a CR nucleus with a known energy hits a
grain, depositing a certain amount of energy. As a result, we obtain the energy
and temperature spectra for grains affected by CR hits. This allows to improve
the existing approaches on CR-induced whole-grain heating in astrochemical
modeling.
