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A complete flux-limited sample of 50 galaxies is presented havingf_{\nu}(24um) > 10mJy, chosen from a survey with the Multiband ImagingPhotometer on Spitzer (MIPS) of 8.2 deg^{2} within the NOAO Deep Wide-FieldSurvey region in Bootes (NDWFS). Spectra obtained with the low-resolutionmodules of the Infrared Spectrograph on Spitzer (IRS) are described for 36galaxies within this sample; 25 show strong PAH emission featurescharacteristic of starbursts, and 11 show silicate absorption or emission,emission lines, or featureless spectra characteristic of AGN. Infrared oroptical spectral classifications are available for 48 of the entire sample of50; 33 galaxies are classified as starbursts and 15 as AGN. (There are anadditional 19 Galactic stars with f_{\nu}(24um) > 10mJy in the survey area.)Using a relation between 7.7um PAH luminosity and star formation rate derivedfrom previous IRS observations of starbursts, the star formation rate per unitvolume of the local universe (SFRD) is determined from the complete sample andis found to be 0.008 \mdot Mpc^{-3}. Individual sources in the sample have starformation rates from 0.14 to 160 \mdot. The derived value for the local SFRD isabout half that of the local SFRD deduced from bolometric luminosities of theIRAS 60um Bright Galaxy Sample, with the deficiency being at lower luminositiesand arising primarily from the small number of low luminosity sources in the 10mJy sample. The agreement for higher luminosities confirms the validity ofusing the 7.7um PAH feature as a measure of SFRD in the high redshift universe,where this is often the only indicator available for faint sources.

Spitzer Spectra of a 10 mJy Galaxy Sample and the Star Formation Rate in the Local Universe