TY - JOUR
T1 - Understanding radio-selected thermal sources in M33
T2 - Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations
AU - Buckalew, Brent A.
AU - Kobulnicky, Henry A.
AU - Darnel, Jonathan M.
AU - Polomski, Elisha
AU - Gehrz, Robert D.
AU - Humphreys, Roberta M.
AU - Woodward, Charles E.
AU - Hinz, Joannah L.
AU - Engelbracht, C. W.
AU - Gordon, Karl D.
AU - Misselt, K.
AU - Pérez-González, P. G.
AU - Rieke, George H.
AU - Willner, S. P.
AU - Ashby, M. L.
AU - Barmby, P.
AU - Pahre, M. A.
AU - Roellig, T. L.
AU - Devereux, Nick
AU - Loon, Jacco Th
AU - Brandl, B.
PY - 2006/2
Y1 - 2006/2
N2 - 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, K s-band extinctions (A Ks) of 0-1 mag, and stellar masses of 10 3-10 4 M odot;. 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 (1-10 3 M ⊙) and temperatures (40-90 K) of the clusters' local interstellar medium. Extinctions derived from the JHK s, 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.
AB - 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, K s-band extinctions (A Ks) of 0-1 mag, and stellar masses of 10 3-10 4 M odot;. 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 (1-10 3 M ⊙) and temperatures (40-90 K) of the clusters' local interstellar medium. Extinctions derived from the JHK s, 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.
KW - Dust, extinction
KW - Galaxies: individual (M33)
KW - Galaxies: star clusters
KW - ISM: structure
KW - Infrared: ISM
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U2 - 10.1086/498572
DO - 10.1086/498572
M3 - Article
AN - SCOPUS:33644923784
SN - 0067-0049
VL - 162
SP - 329
EP - 345
JO - Astrophysical Journal, Supplement Series
JF - Astrophysical Journal, Supplement Series
IS - 2
ER -