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UCH II regions in extragalactic clusters and associations

Published online by Cambridge University Press:  26 May 2016

Kelsey E. Johnson
Kelsey E. Johnson*
Affiliation:
National Radio Astronomy Observatory, PO Box 0, Socorro, NM87801, USA and Department of Astronomy, University of Wisconsin, 475 N. Charter Street, Madison, WI 53706, USA

Abstract

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In recent years, a number of extragalactic massive stars clusters have been detected which are still deeply embedded in their birth material In many cases, these clusters are only visible in the mid-IR to radio regimes, and have typically been detected as ‘inverted’ spectrum radio sources. These clusters appear to have properties which are analogous to those of ultracompact H ii (UCH ii) regions in the Galaxy, albeit vastly scaled up in total mass and luminosity. The ultra-young clusters appear to form with a continuum of masses, and the most massive are consistent with being the progenitors of globular clusters. Here I will overview the properties of the currently known sample of ultradense H ii (UDH ii) regions and examine their relation to Galactic UCH ii regions.

Type
Part 3. Location and Distribution of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 474 - 480
Copyright
Copyright © Astronomical Society of the Pacific 2003 

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