Finding Signatures of the Youngest Starbursts

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dc.creatorKobulnicky, Chip
dc.creatorJohnson, Kelsey E.
dc.date2000-11-22
dc.date.accessioned2026-07-07T01:56:38Z
dc.date.available2026-07-07T01:56:38Z
dc.descriptionEmbedded 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.
dc.description6 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
dc.identifierhttps://arxiv.org/abs/astro-ph/0011409
dc.identifierhttp://arxiv.org/abs/astro-ph/0011409
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/2070
dc.subjectAstrophysics
dc.titleFinding Signatures of the Youngest Starbursts
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