抄録
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 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 II regions. The estimated typical radius of the dust cavity of the Galactic compact H II regions is about 30% of the Strömgren radius. Taking into account uncertainties in both 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.
本文言語 | English |
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ページ(範囲) | 688-696 |
ページ数 | 9 |
ジャーナル | Astrophysical Journal |
巻 | 570 |
号 | 2 I |
DOI | |
出版ステータス | Published - 2002 5月 10 |
外部発表 | はい |
ASJC Scopus subject areas
- 天文学と天体物理学
- 宇宙惑星科学