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We present initial results from a population synthesis model aimed atdetermining the star formation rate of the Milky-Way. We find that a total starformation rate of 0.68 to 1.45 Msun/yr is able to reproduce the observed numberof young stellar objects in the Spitzer/IRAC GLIMPSE survey of the Galacticplane, assuming simple prescriptions for the 3D Galactic distributions of YSOsand interstellar dust, and using model SEDs to predict the brightness and colorof the synthetic YSOs at different wavelengths. This is the first Galaxy-widemeasurement derived from pre-main-sequence objects themselves, rather thanglobal observables such as the total radio continuum, Halpha, or FIR flux. Thevalue obtained is slightly lower than, but generally consistent with previouslydetermined values. We will extend this method in the future to fit thebrightness, color, and angular distribution of YSOs, and simultaneously makeuse of multiple surveys, to place constraints on the input assumptions, andreduce uncertainties in the star formation rate estimate. Ultimately, this willbe one of the most accurate methods for determining the Galactic star formationrate, as it makes use of stars of all masses (limited only by sensitivity)rather than solely massive stars or indirect tracers of massive stars.

The present-day star formation rate of the Milky-Way determined from Spitzer detected young stellar objects