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Radiative transfer of ionizing radiation through gas and dust: grain charging in star-forming regions
- Source :
- Monthly Notices of the Royal Astronomical Society. 510:1068-1082
- Publication Year :
- 2021
- Publisher :
- Oxford University Press (OUP), 2021.
-
Abstract
- The presence of charged dust grains is known to have a profound impact on the physical evolution of the multiphase interstellar medium (ISM). Despite its importance, this process is still poorly explored in numerical simulations due to its complex physics and the tight dependence on the environment. Here we introduce a novel implementation of grain charging in the cosmological radiative transfer code CRASH. We first benchmark the code predictions on a series of idealized dusty HII regions created by a single star, in order to assess the impact of grain properties on the resulting spatial distribution of charges. Second, we perform a realistic radiative transfer simulation of a star forming region extracted from a dusty galaxy evolving in the Epoch of Reionization. We find that $\sim 13$ % of the total dust mass gets negatively charged, mainly silicate and graphite grains of radius micron. A complex spatial distribution of grain charges is also found, primarily depending on the exposure to stellar radiation and strongly varying along different lines of sight, as a result of radiative transfer effects. We finally assess the impact of grain properties (both chemical composition and size) on the resulting charge distribution. The new implementation described here will open up a wide range of possible studies investigating the physical evolution of the dusty ISM, nowadays accessible to observations of high and low redshift galaxies.<br />Comment: MNRAS in press
- Subjects :
- Physics
Range (particle radiation)
Cosmology and Nongalactic Astrophysics (astro-ph.CO)
extinction
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Radius
Radiation
Astrophysics - Astrophysics of Galaxies
Galaxy
Redshift
Interstellar medium
radiative transfer
Space and Planetary Science
cosmology: theory
Astrophysics of Galaxies (astro-ph.GA)
Radiative transfer
Astrophysics::Earth and Planetary Astrophysics
(ISM:) dust
Astrophysics - Cosmology and Nongalactic Astrophysics
Reionization
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 13652966 and 00358711
- Volume :
- 510
- Database :
- OpenAIRE
- Journal :
- Monthly Notices of the Royal Astronomical Society
- Accession number :
- edsair.doi.dedup.....2a2a151600a18718b54b83f9fee47339