Abstract

We propose the Spitzer SDSS Statistical Spectroscopic Survey (S5), a unique and unprecedented legacy survey to obtain low and high resolution mid-infrared (MIR) IRS spectra of a large optically selected, statistical sample of 300 star-forming galaxies with available UV photometry, selected from the SDSS at redshifts 0.05 < z < 0.1. S5 will result in a powerful database of MIR spectra of homogeneously selected star-forming galaxies that will help answer key questions, develop new techniques and define the science goals for future large scale optical+IR galaxy evolution investigations, of immediate relevance as we enter the age of Herschel, WISE and JWST. Local star-forming galaxies selected from the vast SDSS sample will provide the perfect laboratory for combining and calibrating the optical and MIR diagnostics to be used in the next generation of low and high-z observations and theoretical models of star formation in galaxies. This program contains the Priority 2 observations.