Ram Pressure Stripping in NGC 4330

Physics

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Galaxies: Ism, Infrared: Galaxies, Infrared: Ism, Ism: Dust, Extinction

Scientific paper

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. 2008), 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 effects of stripping on the galaxy's ISM with high angular resolution and sensitivity at 8μm, and to measure the effects on optically obscured star formation at 24μm. We find 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 diffuse HI gas.

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