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Age, size, and posi...
Age, size, and position of H II regions in the Galaxy : Expansion of ionized gas in turbulent molecular clouds
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- Tremblin, Pascal (author)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),University of Exeter, UK; Centre d'études de Saclay, France,Nordic Institute for Theoretical Physics NORDITA,University of Exeter, United Kingdom
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Anderson, L. D. (author)
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Didelon, P. (author)
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- Raga, Alejandro C. (author)
- KTH,Stockholms universitet,Nordiska institutet för teoretisk fysik (Nordita),Universidad Nacional Autónoma de México, Mexico,Nordic Institute for Theoretical Physics NORDITA
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Minier, V. (author)
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Ntormousi, E. (author)
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Pettitt, A. (author)
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Pinto, C. (author)
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Samal, M. R. (author)
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Schneider, N. (author)
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Zavagno, A. (author)
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(creator_code:org_t)
- 2014-08-05
- 2014
- English.
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In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 568, s. A4-
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Abstract
Subject headings
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- Aims. This work aims to improve the current understanding of the interaction between H II regions and turbulent molecular clouds. We propose a new method to determine the age of a large sample of OB associations by investigating the development of their associated H II regions in the surrounding turbulent medium. Methods. Using analytical solutions, one-dimensional (ID), and three-dimensional (3D) simulations, we constrained the expansion of the ionized bubble depending on the turbulence level of the parent molecular cloud. A grid of 1D simulations was then computed in order to build isochrone curves for Hit regions in a pressure size diagram. This grid of models allowed us to date a large sample of OB associations that we obtained from the Hit Region Discovery Survey (HRDS). Results. Analytical solutions and numerical simulations showed that the expansion of H II regions is slowed down by the turbulence up to the point where the pressure of the ionized gas is in a quasi-equilibrium with the turbulent ram pressure. Based on this result, we built a grid of ID models of the expansion of Hit regions in a profile based on Larson's laws. We take the 3D turbulence into account with an effective ID temperature profile. The ages estimated by the isochrones of this grid agree well with literature values of well known regions such as Rosette, RCW 36, RCW 79, and M 16. We thus propose that this method can be used to find ages of young OB associations through the Galaxy and also in nearby extra-galactic sources.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- stars: formation
- HII regions
- methods: observational
- methods: numeric
- ISM: structure
Publication and Content Type
- ref (subject category)
- art (subject category)
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- By the author/editor
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Tremblin, Pascal
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Anderson, L. D.
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Didelon, P.
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Raga, Alejandro ...
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Minier, V.
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Ntormousi, E.
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show more...
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Pettitt, A.
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Pinto, C.
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Samal, M. R.
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Schneider, N.
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Zavagno, A.
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show less...
- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
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Astronomy and As ...
- By the university
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Stockholm University
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Royal Institute of Technology