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We analyze Spitzer GLIMPSE, MSX, and WMAP images of the Milky Way to identify8 micron and free-free sources in the Galaxy. Seventy-two of the eighty-eightWMAP sources have coverage in the GLIMPSE and MSX surveys suitable foridentifying massive star forming complexes (SFC). We measure the ionizingluminosity functions of the SFCs and study their role in the turbulent motionof the Galaxy's molecular gas. We find a total Galactic free-free flux f_{\nu}= 46177.6 Jy; the 72 WMAP sources with full 8 micron coverage account for34263.5 Jy (~75%), with both measurements made at \nu=94GHz (W band). We find atotal of 280 SFCs, of which 168 have unique kinematic distances and free-freeluminosities. We use a simple model for the radial distribution of starformation to estimate the free-free and ionizing luminosity for the sourceslacking distance determinations. The total dust-corrected ionizing luminosityis Q = 2.9 \pm 0.5 x 10^53 photons s^-1, which implies a galactic starformation rate of 1.2 \pm 0.2 M_{\sun} yr^-1. We present the (ionizing)luminosity function of the SFCs, and show that 24 sources emit half theionizing luminosity of the Galaxy. The SFCs appear as bubbles in GLIMPSE or MSXimages; the radial velocities associated with the bubble walls allow us toinfer the expansion velocity of the bubbles. We calculate the kineticluminosity of the bubble expansion and compare it to the turbulent luminosityof the inner molecular disk. SFCs emitting 80% of the total galactic free-freeluminosity produce a kinetic luminosity equal to 65% of the turbulentluminosity in the inner molecular disk. This suggests that the expansion of thebubbles is a major driver of the turbulent motion of the inner Milky Waymolecular gas.

Milky Way Star Forming Complexes and the Turbulent Motion of the Galaxy's Molecular Gas