Dust in Giant Extragalactic H II Regions in M101

Details Dust in Giant Extragalactic H II Regions in M101 Dust in Giant Extragalactic H II Regions in M101

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...60r&link_type=abstract

Spitzer Proposal ID #60

Physics

Scientific paper

This program is aimed at investigating the evolution of dust grain properties as a function of star formation activity. This program is aimed at acquiring 4-200 micron photometric spectral energy distributions on a large number (~500) of H II regions in M101. All of M101 (35' x 35') will be imaged with MIPS and IRAC resulting in images of the galaxy at 7 wavelengths from 4 to 160 microns. In addition, a smaller sample (~10) of the brighter H II regions will be observed with MIPS SED mode and IRS in both low and high resolution modes. This sample was defined to include H II regions in M101 which span a range of metallicities (7.9-9.1), luminosities, and dust contents. The low resolution spectroscopy will be used to determine the PAH emission spectrum and continuum level. The high resolution IRS spectroscopy will give various emission lines which act as diagnostics of the gas and stars present. When combined with existing ultraviolet images of M101, the resulting data will be used to probe the properties of dust associated with H II regions. This will be done using their ultraviolet attenuations and PAH emission spectra.

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