Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5826r&link_type=abstract
American Astronomical Society, AAS Meeting #211, #58.26; Bulletin of the American Astronomical Society, Vol. 39, p.838
Other
Scientific paper
We present our study of embedded massive clusters in the local starburst galaxy NGC 4449 in an effort to uncover the earliest phases of massive cluster evolution. By combining high resolution imaging from the radio to the ultraviolet, we expose these clusters in the process of emerging from their gaseous and dusty birth cocoons. We use Very Large Array observations at centimeter wavelengths to identify young clusters surrounded by ultra dense HII regions, detectable via their production of thermal free-free radio continuum. Ultraviolet, optical and infrared observations are obtained from the Hubble and Spitzer Space Telescope archives for comparison. Approximately 17% (6 out of 35) of the radio sources do not have optical counterparts and likely represent the youngest (< 3 Myr) clusters in our sample. We derive ages, masses, and extinctions from both nebular emission and SED fitting (when possible), and find that these physical properties only characterize a sub-population of stars within the clusters that have already emerged from their protostellar clouds. We find evidence for another population of heavily embedded stars within the clusters that only begin to contribute to the integrated flux in the near-infrared, since high extinction removes their stellar flux at shorter wavelengths. The results presented here are the first of a larger program to study massive star clusters as they emerge from their birth material and transition from being visible in the radio to optical wavelength regimes.
Goss Miller
Johnson Kaj
Reines Amy E.
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