Spatial Distribution of Dust Grains within H II Regions
arXiv:astro-ph/0201358 · doi:10.1086/339788
Abstract
We discuss the dust distribution within photoionized regions. Assuming a geometry with a central dust cavity, which is strongly suggested by the literature, we can estimate the cavity's radius from the ratio of the infrared and radio fluxes by using a simple transfer model of Lyman continuum photons. We apply the method to a sample of the Galactic H {\sc ii} regions. The estimated typical radius of the dust cavity of the Galactic compact H {\sc ii} regions is about 30% of the Str{ö}mgren radius. Taking account of uncertainties both of the observational data and the model, we can reject a dust distribution lacking a central cavity. Therefore, the dust cavity model is supported independently of the previous works. We discuss the formation mechanism of such a dust cavity and its detectability by present and future infrared facilities.
14 pages (emulateapj), 3 figures, accepted by ApJ
References in corpus (2)
Cited by in corpus (29)
- Rest-frame ultraviolet-to-optical spectral characteristics of extremely metal-poor and metal-free galaxies
- The Dynamics of Radiation Pressure-Dominated HII Regions
- Dispersal of molecular clouds by ionising radiation
- Stellar Evolutionary Effects on the Abundances of PAH and SN-Condensed Dust in Galaxies
- On Radiation Pressure in Static, Dusty HII Regions
- The spectral evolution of the first galaxies. II. Spectral signatures of Lyman continuum leakage from galaxies in the reionization epoch
- Radiation-magnetohydrodynamic simulations of HII regions and their associated PDRs in turbulent molecular clouds
- Star formation rate in galaxies from UV, IR, and H-alpha estimators
- A SCUBA imaging survey of ultracompact HII regions: The environments of massive star formation
- Near-IR integral field spectroscopy of ionizing stars and young stellar objects on the borders of HII regions
- The size--density relation of extragalactic HII regions
- Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
- Spitzer and Herschel multiwavelength characterization of the dust content of evolved HII regions
- The Dust in Lyman Break Galaxies
- Triggered Star Formation and Dust around Mid-Infrared-Identified Bubbles
- A multi-wavelength investigation of RCW175: an HII region harboring spinning dust emission
- Infrared Spectral Energy Distribution Model for Extremely Young Galaxies
- Detecting stellar-wind bubbles through infrared arcs in HII regions
- Simulating Star Clusters Across Cosmic Time: II. Escape Fraction of Ionizing Photons from Molecular Clouds
- Effects of dust scattering albedo and 2175 A bump on ultraviolet colours of normal disc galaxies
- Herschel observations of the Galactic HII region RCW 79
- A bimodal dust grain distribution in the IC 434 HII region
- TODDLERS: A new UV-mm emission library for star-forming regions. 1. Integration with SKIRT and public release
- Dust emission model of Lyman-break galaxies
- The effect of radiation pressure on spatial distribution of dust inside HII regions
- How to move ionized gas: an introduction to the dynamics of HII regions
- Testing an indirect method for identifying galaxies with high levels of Lyman continuum leakage
- Anomalous Microwave Emission in HII regions: is it really anomalous? The case of RCW 49
- Dual-band Unified Exploration of Three CMZ Clouds (DUET). Cloud-wide census of continuum sources showing low spectral indices