Extended UV (XUV) Emission in Nearby Galaxy Disks

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dc.creatorde Paz, A. Gil
dc.creatorThilker, D. A.
dc.creatorBianchi, L.
dc.creatorAragon-Salamanca, A.
dc.creatorBoissier, S.
dc.creatorMadore, B. F.
dc.creatorDiaz-Lopez, C.
dc.creatorTrujillo, I.
dc.creatorPohlen, M.
dc.creatorErwin, P.
dc.creatorZamorano, J.
dc.creatorGallego, J.
dc.creatorIglesias-Paramo, J.
dc.creatorVilchez, J. M.
dc.creatorMolla, M.
dc.creatorMunoz-Mateos, J. C.
dc.creatorPerez-Gonzalez, P. G.
dc.creatorPedraz, S.
dc.creatorSheth, K.
dc.creatorKennicutt Jr, R. C.
dc.creatorSwaters, R.
dc.creatorTeam, the GALEX Science
dc.date2008-01-15
dc.date.accessioned2026-07-07T08:54:33Z
dc.date.available2026-07-07T08:54:33Z
dc.descriptionWe 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.
dc.description4 pages, 2 figures, to appear in the proceedings of "The Formation and Evolution of Galaxy Disks", Rome 2007, organized by the Vatican Observatory, editors J. G. Funes, S.J. and E. M. Corsini
dc.identifierhttps://arxiv.org/abs/0801.2255
dc.identifierhttp://arxiv.org/abs/0801.2255
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/145972
dc.subjectAstrophysics
dc.titleExtended UV (XUV) Emission in Nearby Galaxy Disks
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