2026-05-27T17:04:29Zhttps://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

Extended UV (XUV) Emission in Nearby Galaxy Disks Gil De Paz, Armando Díaz Lopez, Cristina Zamorano Calvo, Jaime Gallego Maestro, Jesús Muñoz Mateos, Juan Carlos Pérez González, Pablo Guillermo Funes, José G. Corsini, Enrico Maria 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. 2023-06-20T13:42:49Z 2023-06-20T13:42:49Z 2023-06-20T13:42:49Z 2008 book part https://hdl.handle.net/20.500.14352/53473 XXXX-XXXX eng ASP Conference Series open access Astronomical Society of the Pacific