Radiative transfer of ionizing radiation through gas and dust: stellar source case

Abstract

We present a new dust extension to the Monte Carlo radiative transfer code crash, which enables it to simulate the propagation of ionizing radiation through mixtures of gas and dust. The new code is applied to study the impact of dust absorption on idealized galactic H II regions and on small scale reionization. We find that H II regions are reduced in size by the presence of dust, while their inner temperature and ionization structure remain largely unaffected. In the small scale reionization simulation, dust hardens ionization fronts and delays the overlap of ionized bubbles. This effect is found to depend only weakly on the assumed abundance of dust in underdense regions.

17 pages, 14 figures. Accepted for publication in MNRAS

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• The assembly of dusty galaxies at $z\ge 4$: statistical properties
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• The Polycyclic Aromatic Hydrocarbon Mass Fraction on a 10 pc scale in the Magellanic Clouds
• Modeling UV Radiation Feedback from Massive Stars: III. Escape of Radiation from Star-forming Giant Molecular Clouds
• The assembly of dusty galaxies at $z\ge 4$: the build-up of stellar mass and its scaling relations with hints from early JWST data
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• Investigating X-ray sources during the epoch of reionization with the 21 cm signal
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• Dust-UV offsets in high-redshift galaxies in the Cosmic Dawn III simulation