On Radiation Pressure in Static, Dusty H II Regions

@article{Draine2011OnRP,
  title={On Radiation Pressure in Static, Dusty H II Regions},
  author={Bruce T. Draine},
  journal={The Astrophysical Journal},
  year={2011},
  volume={732},
  pages={100}
}
  • B. Draine
  • Published 1 March 2010
  • Physics
  • The Astrophysical Journal
Radiation pressure acting on gas and dust causes H II regions to have central densities that are lower than the density near the ionized boundary. H II regions in static equilibrium comprise a family of similarity solutions with three parameters: β, γ, and the product Q 0 n rms; β characterizes the stellar spectrum, γ characterizes the dust/gas ratio, Q 0 is the stellar ionizing output (photons/s), and n rms is the rms density within the ionized region. Adopting standard values for β and… Expand
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References

SHOWING 1-10 OF 32 REFERENCES
The Effects of Dust on Compact and Ultracompact H II Regions
We calculate numerical models of dusty H II regions using the Cloudy photoionization code with a grain size distribution. Dust sublimation causes a depletion of grain sizes and types within theExpand
The size-density relation of extragalactic H II regions
Aims. We investigate the size-density relation in extragalactic H ii regions, with the aim of understanding the role of dust and different physical conditions in the ionized medium. Methods. First,Expand
Spatial Distribution of Dust Grains within H II Regions
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 theExpand
THE DYNAMICS OF RADIATION-PRESSURE-DOMINATED H II REGIONS
We evaluate the role of radiation pressure in the dynamics of H II regions. We first determine under what conditions radiation pressure is significant in comparison to gas pressure and show that,Expand
On the physics of dust grains in hot gas.
Charging of dust grains in hot (10/sup 4/--10/sup 9/ K) plasma is studied, including photoelectron and secondary electron emission, field emission, and transmission of electrons and ions through theExpand
Compact H II Regions: What Lies Within?
This paper presents both stellar mass and H ii region diagnostics based on dusty, radiation-pressure-dominated photoionization models for compact and ultracompact H ii regions, and compares theseExpand
Internal Dust Correction Factors for Star Formation Rates Derived for Dusty \HII Regions and Starburst Galaxies
Star formation rates in galaxies are frequently estimated using the Balmer line fluxes of their H II regions. However, these can be systematically underestimated because dust competes for theExpand
Interstellar Dust Models Consistent with Extinction, Emission, and Abundance Constraints
We present new interstellar dust models that have been derived by simultaneously fitting the far-ultraviolet to near-infrared extinction, the diffuse infrared (IR) emission and, unlike previousExpand
The Bubbling Galactic Disk
A visual examination of the images from the Galactic Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) has revealed 322 partial and closed rings that we propose represent partially or fullyExpand
High spatial resolution radio continuum observations of compact H II regions in the Magellanic Clouds
We present high spatial resolution observations of the 6 cm continuum emission of compact H.. regions in well-known sites of massive star formation located in the Small and Large Magellanic Clouds.Expand
...
1
2
3
4
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