Spitzer Analysis Of HII Complexes In The Magellanic Clouds And A Suitable Monochromatic Obscured Star Formation Rate Indicator

Details Spitzer Analysis Of HII Complexes In The Magellanic Clouds And A Suitable Monochromatic Obscured Star Formation Rate Indicator Spitzer Analysis Of HII Complexes In The Magellanic Clouds And A Suitable Monochromatic Obscured Star Formation Rate Indicator

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545909l&link_type=abstract

American Astronomical Society, AAS Meeting #215, #459.09; Bulletin of the American Astronomical Society, Vol. 42, p.486

Astronomy and Astrophysics

Astronomy

Scientific paper

HII complexes are the birth places of stars, and as such they provide the best measures of current star formation rates in galaxies. The close proximity of the Magellanic Clouds allows us to probe the
nature of these star forming regions at small spatial scales ( 10pc). We present the spatial analysis, via aperture/annulus photometry, of 16 LMC and 16 SMC HII complexes using the Spitzer IRAC and MIPS bands. The results are compared with the bolometric luminosities, LTIR, where LTIR is integrated from 8um to 500um. We find that the HII complex sizes depend on the dust component measured. The warm dust probed by 24um extends out to 50pc. The cold dust probed by 160um extends out to 90pc. The sizes measured via 70um are nearly identical to the sizes measured via LTIR ( 70pc) as a result of the SEDs of the star forming regions all peaking near 70um at all radii. Consequently, the 70um band remains relatively constant when normalized by the LTIR at all radii (L70 0.45 LTIR). Contrarily, the normalized 24um band is highly peaked in the center of the HII complexes, and the normalized 160um band is highly peaked in the outer radii of the HII complexes. The normalized 8um and 24um bands also show a significant dependence on the host galaxy in that they are weaker at all radii in the SMC relative to the LMC. The 1sigma standard deviation of the normalized 70um luminosities is a lower fraction of the mean (0.05 to 0.12 depending on radii), relative to the normalized 8um, 24um, and 160um luminosities (0.15 to 0.52). From these findings we argue that 70um is the most suitable IR band to use as a monochromatic obscured star formation rate indicator. SFR calculations from the literature, modified to use 70um luminosities, are included.

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