Bibcode
Gil de Paz, A.; Thilker, D. A.; Bianchi, L.; Aragón-Salamanca, A.; Boissier, S.; Madore, B. F.; Díaz-López, C.; Trujillo, I.; Pohlen, M.; Erwin, P.; Zamorano, J.; Gallego, J.; Iglesias-Páramo, J.; Vílchez, J. M.; Mollá, M.; Muñoz-Mateos, J. C.; Pérez-González, P. G.; Pedraz, S.; Sheth, K.; Kennicutt, R. C.; Swaters, R. A.
Bibliographical reference
Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Edited by José G. Funes, S.J., and Enrico Maria Corsini. San Francisco: Astronomical Society of the Pacific, 2008., p.197
Advertised on:
10
2008
Citations
4
Refereed citations
4
Description
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)<5 mag] 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 H I but relatively poor in molecular gas, have stellar
populations with luminosity-weighted ages of ˜1 Gyr, and
ionized-gas metal abundances of ˜Z_{&sun;}/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.