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UCHII regions in the Antennae

Published online by Cambridge University Press:  01 August 2006

L. Snijders ,
L. J. Kewley ,
P. P. van der Werf  and
B. R. Brandl
L. Snijders
Affiliation:
Leiden Observatory, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands email: [email protected]
L. J. Kewley
Affiliation:
Institute for Astronomy, 680 Woodlawn Drive, Honolulu, Hawaii, USA
P. P. van der Werf
Affiliation:
Leiden Observatory, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands email: [email protected]
B. R. Brandl
Affiliation:
Leiden Observatory, P.O. Box 9513, NL-2300 RA Leiden, The Netherlands email: [email protected]
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Abstract

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We explore the physical characteristics of young stellar clusters in the Antennae by combining recent ground- and space-based mid-infrared observations with a newly developed set of diagnostic diagrams. Spitzer data give an overview of the star-forming regions extending over hundreds of parsecs, showing a dominant diffuse ISM component with a density of 102 cm−3 plus a small fraction of very compact material (106 cm−3). With its higher spatial resolution VISIR gives a close-up view of the latter component. Its emission line ratios suggest that these regions are fundamentally different from local star-forming regions. Instead of having small isolated UCHII regions, as in local star-forming regions, the average density of the medium of the whole region falls in the (ultra)compact regime, exceeding 104 cm−3 over tens of parsecs.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 476
Copyright
Copyright © International Astronomical Union 2007

References

Snijders, L., van der Werf, P. P., Brandl, B. R., Mengel, S., Schaerer, D., & Wang, Z. 2006, ApJ 648, 25CrossRefGoogle Scholar