Temperature spectra of interstellar dust grains heated by cosmic-rays II: dark cloud cores
| Autor: | Juris Kalvāns |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Astrochemistry 010308 nuclear & particles physics Molecular cloud Extinction (astronomy) FOS: Physical sciences Astronomy and Astrophysics Cosmic ray Radius 01 natural sciences Molecular physics Astrophysics - Astrophysics of Galaxies Spectral line Space and Planetary Science Desorption Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Cosmic dust |
| DOI: | 10.48550/arxiv.1810.00708 |
| Popis: | 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. Comment: Accepted for publication in ApJS. 15 pages + 24 Tables in Appendix |
| Databáze: | OpenAIRE |
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