Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-15
Astronomy and Astrophysics
Astrophysics
4 pages, 2 figures, to appear in the proceedings of "The Formation and Evolution of Galaxy Disks", Rome 2007, organized by the
Scientific paper
We summarize the main properties of the extended UV (XUV) emission found in roughly 30% of the nearby spiral galaxies observed by the GALEX satellite. Two different classes of XUV disks are identified, the Type 1 XUV disks where significant, structured UV-bright features are found beyond the "classical" azimuthally-averaged star-formation threshold, and the Type 2 XUV disks, which are characterized by very extended (seven times the area where most of the stellar mass is found), blue [(FUV-K)<5mag] outer disks. These latter disks are extreme examples of galaxies growing inside-out. The few XUV disks studied in detail to date are rich in HI but relatively poor in molecular gas, have stellar populations with luminosity-weighted ages of ~1 Gyr, and ionized-gas metal abundances of ~Zsun/10. As part of the CAHA-XUV project we are in the process of obtaining deep multi-wavelength imaging and spectroscopy of 65 XUV-disk galaxies so to determine whether or not these properties are common among XUV disks.
Aragon-Salamanca Alfonso
Bianchi Luciana
Boissier Samuel
Diaz-Lopez C.
Erwin Patrick
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