Spitzer Mid-infrared Study of Compact HII Regions in the Magellanic Clouds

Details Spitzer Mid-infrared Study of Compact HII Regions in the Magellanic Clouds Spitzer Mid-infrared Study of Compact HII Regions in the Magellanic Clouds

2008-05-15

arxiv.org/abs/0805.2337v1

Astron.Astrophys.487:567-573,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 4 figures, Accepted for publication in Astronomy & Astrophysics (higher resolution version is available in http://w

Scientific paper

10.1051/0004-6361:200809662

We present a study of the mid-infrared properties and dust content of a sample of 27 HII ``blobs'', a rare class of compact HII regions in the Magellanic Clouds. A unique feature of this sample is that even though these HII regions are of high and low excitation they have nearly the same physical sizes ~1.5-3 pc. We base our analysis on archival 3-8 microns infrared imagery obtained with the Infrared Array Camera (IRAC) on board the Spitzer Space Telescope. 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 HII regions. Higher excitation ``blobs'' (HEBs) display stronger 8 micron emission and redder colors than their low-excitation counterparts (LEBs).

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