AAS 207th Meeting, 8-12 January 2006
Session 64 ISM outside the Milky Way
Poster, Tuesday, 9:20am-6:30pm, January 10, 2006, Exhibit Hall

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[64.11] Extra-Disk Star Formation: A Comparison of VLA HI and GALEX UV data

J.S. Sandell, J.E. Hibbard (NRAO), J. van Gorkhom, D. Schminovich (Columbia University), NRAO Collaboration, Columbia U. Collaboration

We present GALEX FUV (1530A) and NUV (2310) and VLA HI spectral line observations of the interacting/merging systems Mk 348, NGC 7252, VV 114, and NGC 4038/9. All systems exhibit extended low surface brightness UV emission outside of their main bodies, in extended gaseous disks or tidal features. We find a good correlation between the HI surface density and UV surface brightness, with FUV emission consistently present when the gas surface density exceeds 2 Mo/pc2. This supports the idea of a star formation threshold surface density for extra-disk star formation.

This project was made possible by support from the National Science Foundation and the National Radio Astronomy Observatory

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