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; Chick 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 Loon; B. Brandl

doi:10.1086/498572

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, Chick 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

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4 Scopus citations

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 language	English (US)
Pages (from-to)	329-345
Number of pages	17
Journal	Astrophysical Journal, Supplement Series
Volume	162
Issue number	2
DOIs	https://doi.org/10.1086/498572
State	Published - Feb 2006

Keywords

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

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1086/498572

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Buckalew, B. A., Kobulnicky, H. A., Darnel, J. M., Polomski, E., Gehrz, R. D., Humphreys, R. M., Woodward, C. E., Hinz, J. L., Engelbracht, C. W., Gordon, K. D., Misselt, K., Pérez-González, P. G., Rieke, G. H., Willner, S. P., Ashby, M. L., Barmby, P., Pahre, M. A., Roellig, T. L., Devereux, N., ... 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

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

@article{5016fbacd5ac4afea91de8b35023bf9f,

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

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.",

keywords = "Dust, extinction, Galaxies: individual (M33), Galaxies: star clusters, ISM: structure, Infrared: ISM",

author = "Buckalew, {Brent A.} and Kobulnicky, {Henry A.} and Darnel, {Jonathan M.} and Elisha Polomski and Gehrz, {Robert D} and Humphreys, {Roberta M} and Woodward, {Chick E} and Hinz, {Joannah L.} and Engelbracht, {C. W.} and Gordon, {Karl D.} and K. Misselt and P{\'e}rez-Gonz{\'a}lez, {P. G.} and Rieke, {George H.} and Willner, {S. P.} and Ashby, {M. L.} and P. Barmby and Pahre, {M. A.} and Roellig, {T. L.} and Nick Devereux and Loon, {Jacco Th} and B. Brandl",

year = "2006",

month = feb,

doi = "10.1086/498572",

language = "English (US)",

volume = "162",

pages = "329--345",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

publisher = "American Astronomical Society",

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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, Chick 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 -

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

Abstract

Keywords

UN SDGs

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