A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe

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dc.creatorThilker, David A.
dc.creatorBianchi, Luciana
dc.creatorMeurer, Gerhardt
dc.creatorde Paz, Armando Gil
dc.creatorBoissier, Samuel
dc.creatorMadore, Barry F.
dc.creatorBoselli, Alessandro
dc.creatorFerguson, Annette M. N.
dc.creatorMuńoz-Mateos, Juan Carlos
dc.creatorMadsen, Greg J.
dc.creatorHameed, Salman
dc.creatorOverzier, Roderik A.
dc.creatorForster, Karl
dc.creatorFriedman, Peter G.
dc.creatorMartin, D. Christopher
dc.creatorMorrissey, Patrick
dc.creatorNeff, Susan G.
dc.creatorSchiminovich, David
dc.creatorSeibert, Mark
dc.creatorSmall, Todd
dc.creatorWyder, Ted K.
dc.creatorDonas, Jose
dc.creatorHeckman, Timothy M.
dc.creatorLee, Young-Wook
dc.creatorMilliard, Bruno
dc.creatorRich, R. Michael
dc.creatorSzalay, Alex S.
dc.creatorWelsh, Barry Y.
dc.creatorYi, Sukyoung K.
dc.date2007-12-20
dc.date.accessioned2026-07-07T11:39:36Z
dc.date.available2026-07-07T11:39:36Z
dc.descriptionWe have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Herein, we compare GALEX UV and visible--NIR images of 189 nearby (D$<$40 Mpc) S0--Sm galaxies included in the GALEX Atlas of Nearby Galaxies and present the first catalogue of XUV-disk galaxies. We find that XUV-disk galaxies are surprisingly common but have varied relative (UV/optical) extent and morphology. Type~1 objects ($\ga$20% incidence) have structured, UV-bright/optically-faint emission features in the outer disk, beyond the traditional star formation threshold. Type~2 XUV-disk galaxies ($\sim$10% incidence) exhibit an exceptionally large, UV-bright/optically-low-surface-brightness (LSB) zone having blue $UV-K_s$ outside the effective extent of the inner, older stellar population, but not reaching extreme galactocentric distance. If the activity occuring in XUV-disks is episodic, a higher fraction of present-day spirals could be influenced by such outer disk star formation. Type~1 disks are associated with spirals of all types, whereas Type~2 XUV-disks are predominantly found in late-type spirals. Type~2 XUV-disks are forming stars quickly enough to double their [presently low] stellar mass in the next Gyr (assuming a constant SF rate). XUV-disk galaxies of both types are systematically more gas-rich than the general galaxy population. Minor external perturbation may stimulate XUV-disk incidence, at least for Type~1 objects. XUV-disks are the most actively evolving galaxies growing via inside-out disk formation in the current epoch, and may constitute a segment of the galaxy population experiencing significant, continued gas accretion from the intergalactic medium or neighboring objects.
dc.description83 pages, 16 figures, 2 tables. Appearing in the GALEX special issue of ApJS. (A version with high quality figures and proof corrections can be found at http://www.journals.uchicago.edu/toc/apjs/173/2)
dc.identifierhttps://arxiv.org/abs/0712.3555
dc.identifierhttp://arxiv.org/abs/0712.3555
dc.identifierAstrophys.J.Suppl.173:538-571,2007
dc.identifierdoi:10.1086/523853
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/199976
dc.subjectAstrophysics
dc.titleA Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
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