FULL TITLE ASP Conference Series, Vol. VOLUME, YEAR OF PUBLICATION NAMES OF EDITORS The Spitzer View of M101: Preliminary Results (original) (raw)

2020

Abstract

Abstract. New Spitzer images of M101 from 3.5 to 160 µm are presented. Preliminary analysis focusing on the dependence of the infrared spectral energy distribution of HII regions as a function of metallicity finds that the mid-infrared PAH features become weak or absent between metallicities of 8.5 and 8.1. There is also a trend towards hotter dust temperature as metallicity decreases. M101 is a large (> 30 diameter), face-on spiral galaxy at a distance of 6.7 kpc Sufficient infrared spatial resolution and sensitivity to study bright and faint HII regions in M101 is now possible with the launch of the Spitzer Space Telescope (Spitzer, Werner et al. 2004). Our program utilizes the imaging and spectroscopic capabilities of Spitzer to study the metallicity dependence of the spectral energy distributions (SEDs) in M101 HII regions. Spitzer imaging of M101 has been obtained with the Infrared Array Camera (IRAC, Fazio et al. 2004) at 3.6, 4.5, 5.8, 8.0 µm and with the Multiband Imaging...

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