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arXiv:astro-ph/0011409 (astro-ph)
[Submitted on 22 Nov 2000]

Title:Finding Signatures of the Youngest Starbursts

Authors:Chip Kobulnicky (University of Wisconsin), Kelsey E. Johnson (University of Colorado)
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Abstract: Embedded massive starclusters have recently been identified in several nearby galaxies by means of the radio-wave thermal bremsstrahlung emission from their surrounding HII regions. Energy requirements imply that these optically-obscured starclusters contain 500-1000 O-type stars, making them similar to the ``super starclusters'' observed in many dwarf starbursts and mergers. Based on their high free-free optical depth and visual extinctions of A_V>>10 mag., these massive ``ultra-dense'' HII regions (UDHIIs) are distinct signatures of the youngest, most compact super starclusters. UDHII regions may represent the earliest stages of globular cluster formation. We review the properties of presently-known UDHIIs, and we outline a pictoral evolutionary taxonomy for massive cluster formation which is analogous to the more familiar evolutionary sequence for individual stars.
Comments: 6 pages; uses Springer-Verlag document class; 2 figures +1 color figure To appear in Proceedings of "Starbursts: Near and Far", held at Ringberg Castle, Germany, 10-15 September 2000
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0011409
  (or arXiv:astro-ph/0011409v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0011409

Submission history

From: Henry A. Kobulnicky [view email]
[v1] Wed, 22 Nov 2000 14:48:41 UTC (248 KB)
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