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Title:
Understanding Radio-selected Thermal Sources in M33: Ultraviolet, Optical, Near-Infrared, Spitzer Mid-Infrared, and Radio Observations
Authors:
Buckalew, Brent A.; Kobulnicky, Henry A.; Darnel, Jonathan M.; Polomski, Elisha; Gehrz, Robert D.; Humphreys, Roberta M.; Woodward, Charles E.; Hinz, Joannah L.; Engelbracht, C. W.; Gordon, Karl D.; Misselt, K.; Pérez-González, P. G.; Rieke, George H.; Willner, S. P.; Ashby, M. L.; Barmby, P.; Pahre, M. A.; Roellig, T. L.; Devereux, Nick; Loon, Jacco Th.; Brandl, B.
Affiliation:
AA(Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071; , , .; Current address: Infrared Processing and Analysis Center, California Institute of Technology, Pasadena, CA 91125; .), AB(Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071; , , .), AC(Department of Physics and Astronomy, University of Wyoming, Laramie, WY 82071; , , .), AD(Department of Astronomy, University of Minnesota, Minneapolis, MN 55455; , , , .), AE(Department of Astronomy, University of Minnesota, Minneapolis, MN 55455; , , , .), AF(Department of Astronomy, University of Minnesota, Minneapolis, MN 55455; , , , .), AG(Department of Astronomy, University of Minnesota, Minneapolis, MN 55455; , , , .), AH(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AI(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AJ(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AK(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AL(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AM(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , , , , , .), AN(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AO(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AP(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AQ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; , , , .), AR(NASA Ames Research Center, MS 245-6, Moffett Field, CA 94035-1000 .), AS(Department of Physics, Embry-Riddle Aeronautical University, Prescott, AZ 86301; .), AT(Astrophysics Group, School of Physical and Geographical Sciences, Keele University, Staffordshire ST5 5BG, UK; .), AU(Leiden Observatory, P.O. Box 9513, 2300 RA Leiden, Netherlands; .)
Publication:
The Astrophysical Journal Supplement Series, Volume 162, Issue 2, pp. 329-345. (ApJS Homepage)
Publication Date:
02/2006
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Galaxies: Individual: Messier Number: M33, Galaxies: Star Clusters, Infrared: ISM, ISM: Structure
DOI:
10.1086/498572
Bibliographic Code:
2006ApJS..162..329B

Abstract

We present ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio images of 14 radio-selected objects in M33. These objects are thought to represent the youngest phase of star cluster formation. We have detected the majority of cluster candidates in M33 at all wavelengths. From the near-IR images, we derived ages 2-10 Myr, KS-band extinctions (AKS) of 0-1 mag, and stellar masses of 103-104 Msolar. We have generated spectral energy distributions (SEDs) of each cluster from 0.1 to 160 μm. From these SEDs, we have modeled the dust emission around these star clusters to determine the dust masses (1-103 Msolar) and temperatures (40-90 K) of the clusters' local interstellar medium. Extinctions derived from the JHKS, Hα, and UV images are similar to within a factor of 2 or 3. These results suggest that 11 of the 14 radio-selected objects are optically visible young star clusters with a surrounding H II region, that 2 are background objects, possibly active galactic nuclei (AGNs), and that 1 is a Wolf-Rayet star with a surrounding H II region.
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