2026-05-27T14:42:34Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/534732024-09-10T16:22:34Zcom_20.500.14352_14col_20.500.14352_21

00925njm 22002777a 4500 dc Gil De Paz, Armando author Díaz Lopez, Cristina author Zamorano Calvo, Jaime author Gallego Maestro, Jesús author Muñoz Mateos, Juan Carlos author Pérez González, Pablo Guillermo author 2008 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_⊙/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. 978-1-58381-662-2 https://hdl.handle.net/20.500.14352/53473 http://arxiv.org/abs/0801.2255 Extended UV (XUV) Emission in Nearby Galaxy Disks