The influence of continuum radiation fields on hydrogen radio recombination lines
| Autor: | Andri Prozesky, Derck P. Smits |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
Angular momentum Hydrogen Cosmic microwave background chemistry.chemical_element FOS: Physical sciences Astronomy and Astrophysics 010103 numerical & computational mathematics Astrophysics::Cosmology and Extragalactic Astrophysics Radiation 01 natural sciences Astrophysics - Astrophysics of Galaxies Ionizing radiation Computational physics chemistry Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) 0103 physical sciences Radio frequency 0101 mathematics Absorption (electromagnetic radiation) 010303 astronomy & astrophysics Quantum |
| DOI: | 10.48550/arxiv.1805.02440 |
| Popis: | Calculations of hydrogen departure coefficients using a model with the angular momentum quantum levels resolved that includes the effects of external radiation fields are presented. The stimulating processes are important at radio frequencies and can influence level populations. New numerical techniques with a solid mathematical basis have been incorporated into the model to ensure convergence of the solution. Our results differ from previous results by up to 20 per cent. A direct solver with a similar accuracy but more efficient than the iterative method is used to evaluate the influence of continuum radiation on the hydrogen population structure. The effects on departure coefficients of continuum radiation from dust, the cosmic microwave background, the stellar ionising radiation, and free-free radiation are quantified. Tables of emission and absorption coefficients for interpreting observed radio recombination lines are provided. Comment: 12 pages, 7 figures, 1 table, accepted for publication in MNRAS |
| Databáze: | OpenAIRE |
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