The Evolving ISM in the Milky Way & Nearby Galaxies Ram Pressure Stripping in NGC 4330

We present Spitzer IRAC and MIPS data which provide key insights into the ICM-ISM stripping process. The Virgo Cluster spiral NGC 4330 was observed as part of SPITSOV, the Spitzer Survey of Virgo (Kenney et al. 2008a), and is a nearby and striking case of ram pressure stripping caught in the act. Pressure from the ICM is actively removing the ISM from the galaxy's outer disk, while leaving the older stellar disk undisturbed. Spitzer enables us to observe the e®ects of stripping on the galaxy's ISM with high angular resolution and sensitivity at 8m, and to measure the e®ects on optically obscured star formation at 24m. We ¯nd that the ram pressure does not strongly enhance star formation in the disk near the ICM-ISM boundary, and we detect no star formation or heated PAHs associated with the stripped HI gas. The galaxy's striking \upturn " feature reveals that dense, star-forming ISM is being pushed out of the disk at the same time as the more di®use HI gas