Issue |
A&A
Volume 487, Number 2, August IV 2008
|
|
---|---|---|
Page(s) | 567 - 573 | |
Section | Galactic structure, stellar clusters, and populations | |
DOI | https://doi.org/10.1051/0004-6361:200809662 | |
Published online | 16 June 2008 |
Spitzer mid-infrared study of compact H II regions in the Magellanic Clouds
1
University of Crete, Department of Physics, Heraklion 71003, Greece e-mail: vassilis@physics.uoc.gr
2
IESL/Foundation for Research and Technology – Hellas, 71110 Heraklion, Greece
3
Observatoire de Paris, LERMA, 61 Avenue de l'Observatoire, 75014 Paris, France
Received:
27
February
2008
Accepted:
15
May
2008
Aims. We present a study of the mid-infrared properties and dust content of a sample of 27 H ii “blobs”, a rare class of compact H ii regions in the Magellanic Clouds. A unique feature of this sample is that even though these H ii regions are of high and low excitation they have nearly the same physical sizes ~1.5-3 pc.
Methods. We base our analysis on archival 3–8 μm infrared imagery obtained with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope.
Results. We find that despite their youth, sub-solar metallicity and varied degrees of excitation, the mid-infrared colors of these regions are similar to those of typical H ii regions. Higher excitation “blobs” (HEBs) display stronger 8 μm emission and redder colors than their low-excitation counterparts (LEBs).
Key words: ISM: H ii regions / ISM: dust, extinction / infrared: ISM / infrared: stars / galaxies: Magellanic Clouds
© ESO, 2008
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