Understanding radio-selected thermal sources in M33: Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations

Brent A. Buckalew, Henry A. Kobulnicky, Jonathan M. Darnel, Elisha Polomski, Robert D. Gehrz, Roberta M. Humphreys, Charles E. Woodward, Joannah L. Hinz, C. W. Engelbracht, Karl D. Gordon, K. Misselt, P. G. Pérez-González, George H. Rieke, S. P. Willner, M. L. Ashby, P. Barmby, M. A. Pahre, T. L. Roellig, Nick Devereux, Jacco Th LoonB. Brandl

Research output: Contribution to journalArticle

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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, 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.

Original languageEnglish (US)
Pages (from-to)329-345
Number of pages17
JournalAstrophysical Journal, Supplement Series
Volume162
Issue number2
DOIs
StatePublished - Feb 2006

Fingerprint

radio observation
star clusters
near infrared
H II regions
radio
spectral energy distribution
extinction
dust
Wolf-Rayet stars
stellar mass
active galactic nuclei
energy
wavelength
wavelengths
temperature
young
distribution

Keywords

  • Dust, extinction
  • Galaxies: individual (M33)
  • Galaxies: star clusters
  • Infrared: ISM
  • ISM: structure

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Buckalew, B. A., Kobulnicky, H. A., Darnel, J. M., Polomski, E., Gehrz, R. D., Humphreys, R. M., ... Brandl, B. (2006). Understanding radio-selected thermal sources in M33: Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations. Astrophysical Journal, Supplement Series, 162(2), 329-345. https://doi.org/10.1086/498572

Understanding radio-selected thermal sources in M33 : Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations. / 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.

In: Astrophysical Journal, Supplement Series, Vol. 162, No. 2, 02.2006, p. 329-345.

Research output: Contribution to journalArticle

Buckalew, BA, Kobulnicky, HA, Darnel, JM, Polomski, E, Gehrz, RD, Humphreys, RM, Woodward, CE, Hinz, JL, Engelbracht, CW, Gordon, KD, Misselt, K, Pérez-González, PG, Rieke, GH, Willner, SP, Ashby, ML, Barmby, P, Pahre, MA, Roellig, TL, Devereux, N, Loon, JT & Brandl, B 2006, 'Understanding radio-selected thermal sources in M33: Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations', Astrophysical Journal, Supplement Series, vol. 162, no. 2, pp. 329-345. https://doi.org/10.1086/498572
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. / Understanding radio-selected thermal sources in M33 : Ultraviolet, optical, near-infrared, Spitzer mid-infrared, and radio observations. In: Astrophysical Journal, Supplement Series. 2006 ; Vol. 162, No. 2. pp. 329-345.
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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.

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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 - Infrared: ISM

KW - ISM: structure

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