Recombination line profiles of embedded clusters

We are trying to probe conditions in the youngest super star clusters, those still embedded in dense obscuring clouds. The hydrogen recombination lines in the radio and infrared can be observed through the obscuration, as the optical and UV lines cannot, and give us the kinematics of the ionized gas...

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Bibliographic Details
Published inAstronomy and astrophysics (Berlin) Vol. 489; no. 2; pp. 567 - 569
Main Author Beck, S. C.
Format Journal Article
LanguageEnglish
Published Les Ulis EDP Sciences 01.10.2008
Subjects
Astronomy
Earth, ocean, space
Exact sciences and technology
galaxies: star clusters
infrared: general
line: profiles
Galaxy clusters
Ionized gases
Line shape
infrared: general
line: profiles
Kinematics
galaxies: star clusters
OB stars
Dense cloud
Recombination line
Star clusters
Compact H II region
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Summary:We are trying to probe conditions in the youngest super star clusters, those still embedded in dense obscuring clouds. The hydrogen recombination lines in the radio and infrared can be observed through the obscuration, as the optical and UV lines cannot, and give us the kinematics of the ionized gas. The line profiles of the clusters resemble superpositions of the lines of many very young ultra-compact or hyper-compact HII regions. This can be explained if each OB star is individually embedded in dense material which it is accreting, even as it ionizes. We speculate on what this implies for conditions in the clusters.
Bibliography:istex:262D2ABFCE0E2A9EBF4EF4509430685CB148FAED
publisher-ID:aa10441-08
ark:/67375/80W-4JWFD145-H
other:2008A%26A...489..567B
ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:0004-6361
1432-0746
DOI:10.1051/0004-6361:200810441