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Title:
Searching for the Young Super-Star Clusters in NGC 3627
Authors:
Ginsburg, Adam
Affiliation:
AA(Rice University / NRAO)
Publication:
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #100.03; Bulletin of the American Astronomical Society, Vol. 38, p.1042
Publication Date:
12/2006
Origin:
AAS
Bibliographic Code:
2006AAS...20910003G

Abstract

Searches for optically thick radio HII regions associated with young star clusters has been done primarily towards dwarf starbursts that are free of extended disk synchrotron. Because of this confusion source and the generally weaker star formation in galactic disks, little is known about "supernebulae" associated with SSCs in spiral disks. Deep, arcsecond resolution VLA maps at 20 cm 2 cm of the disk of the nearby actively star forming spiral, NGC 3627, are presented, to study the distribution and properties of its radio HII regions. We discuss the locations, sizes, fluxes and spectral indices of the compact radio sources seen in the highest resolution data. Spectral indices are used to identify and classify young, compact, HII regions. Two to three sources that appear to be compact, massive HII regions associated with disk SSCs are found. These sources are brighter than any HII region complex in the disk of our Galaxy, having ionizing rates of 1052 s-1, and have optically thick turnover frequencies at 2 GHz over 10 20 pc scales. The sources are found primarily at the ends of the bar, suggesting they form from colliding gas clouds in the strong bar potential. Other sources were identified

as SNR, but several compact sources remain unclassified having non-standard spectral indices.

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