Large-Scale Photoevaporation Flows in H II Regions

Details Large-Scale Photoevaporation Flows in H II Regions Large-Scale Photoevaporation Flows in H II Regions

Jan 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003rmxac..15..175h&link_type=abstract

Winds, Bubbles, and Explosions: a conference to honor John Dyson, Pátzcuaro, Michoacán, México, September 9-13, 2002 (Eds. S. J.

Astronomy and Astrophysics

Astronomy

7

H Ii Regions, Hydrodynamics, Ism: Individual (Orion Nebula)

Scientific paper

I present simple analytic models for steady-state photoevaporation flows in H II regions. Two cases are considered: (1) the globally open flow from a plane ionization front, where the ionizing source is offset a finite distance from the front; (2) local flows from the crests of ionization-front undulations in a globally closed H II region. I show that the first case can well reproduce the observed geometry and physical properties of the principal optical line-emitting layer in the inner Orion nebula, while the second case can naturally explain the observed ionized density increase in the vicinity of the Orion bar.

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