A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe

David A. Thilker, Luciana Bianchi, Gerhardt Meurer, Armando Gil De Paz, Samuel Boissier, Barry F. Madore, Alessandro Boselli, Annette M.N. Ferguson, Juan Carlos Muńoz-Mateos, Greg J. Madsen, Salman Hameed, Roderik A. Overzier, Karl Forster, Peter G. Friedman, D. Christopher Martin, Patrick Morrissey, Susan G. Neff, David Schiminovich, Mark Seibert, Todd SmallTed K. Wyder, José Donas, Timothy M. Heckman, Young-Wook Lee, Bruno Milliard, R. Michael Rich, Alex S. Szalay, Barry Y. Welsh, Sukyoung Yi

Research output: Contribution to journalArticle

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Abstract

We have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Here 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 catalog 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 (≳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 (∼10% incidence) exhibit an exceptionally large, UV-bright/optically low surface brightness (LSB) zone having blue UV-Ks outside the effective extent of the inner, older stellar population, but not reaching extreme galactocentric distance. If the activity occurring 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 (currently low) stellar mass in the next Gyr (assuming a constant star formation 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.

Original languageEnglish
Pages (from-to)538-571
Number of pages34
JournalAstrophysical Journal, Supplement Series
Volume173
Issue number2
DOIs
Publication statusPublished - 2007 Dec 1

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disk galaxies
universe
gas
atlas
accretion
perturbation
galaxies
incidence
star formation
intergalactic media
star formation rate
stellar mass
gases
catalogs
brightness
time measurement
rate
stars
thresholds

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Thilker, D. A., Bianchi, L., Meurer, G., De Paz, A. G., Boissier, S., Madore, B. F., ... Yi, S. (2007). A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe. Astrophysical Journal, Supplement Series, 173(2), 538-571. https://doi.org/10.1086/523853
Thilker, David A. ; Bianchi, Luciana ; Meurer, Gerhardt ; De Paz, Armando Gil ; Boissier, Samuel ; Madore, Barry F. ; Boselli, Alessandro ; Ferguson, Annette M.N. ; Muńoz-Mateos, Juan Carlos ; Madsen, Greg J. ; Hameed, Salman ; Overzier, Roderik A. ; Forster, Karl ; Friedman, Peter G. ; Martin, D. Christopher ; Morrissey, Patrick ; Neff, Susan G. ; Schiminovich, David ; Seibert, Mark ; Small, Todd ; Wyder, Ted K. ; Donas, José ; Heckman, Timothy M. ; Lee, Young-Wook ; Milliard, Bruno ; Rich, R. Michael ; Szalay, Alex S. ; Welsh, Barry Y. ; Yi, Sukyoung. / A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe. In: Astrophysical Journal, Supplement Series. 2007 ; Vol. 173, No. 2. pp. 538-571.
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Thilker, DA, Bianchi, L, Meurer, G, De Paz, AG, Boissier, S, Madore, BF, Boselli, A, Ferguson, AMN, Muńoz-Mateos, JC, Madsen, GJ, Hameed, S, Overzier, RA, Forster, K, Friedman, PG, Martin, DC, Morrissey, P, Neff, SG, Schiminovich, D, Seibert, M, Small, T, Wyder, TK, Donas, J, Heckman, TM, Lee, Y-W, Milliard, B, Rich, RM, Szalay, AS, Welsh, BY & Yi, S 2007, 'A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe', Astrophysical Journal, Supplement Series, vol. 173, no. 2, pp. 538-571. https://doi.org/10.1086/523853

A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe. / Thilker, David A.; Bianchi, Luciana; Meurer, Gerhardt; De Paz, Armando Gil; Boissier, Samuel; Madore, Barry F.; Boselli, Alessandro; Ferguson, Annette M.N.; Muńoz-Mateos, Juan Carlos; Madsen, Greg J.; Hameed, Salman; Overzier, Roderik A.; Forster, Karl; Friedman, Peter G.; Martin, D. Christopher; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Small, Todd; Wyder, Ted K.; Donas, José; Heckman, Timothy M.; Lee, Young-Wook; Milliard, Bruno; Rich, R. Michael; Szalay, Alex S.; Welsh, Barry Y.; Yi, Sukyoung.

In: Astrophysical Journal, Supplement Series, Vol. 173, No. 2, 01.12.2007, p. 538-571.

Research output: Contribution to journalArticle

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T1 - A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe

AU - Thilker, David A.

AU - Bianchi, Luciana

AU - Meurer, Gerhardt

AU - De Paz, Armando Gil

AU - Boissier, Samuel

AU - Madore, Barry F.

AU - Boselli, Alessandro

AU - Ferguson, Annette M.N.

AU - Muńoz-Mateos, Juan Carlos

AU - Madsen, Greg J.

AU - Hameed, Salman

AU - Overzier, Roderik A.

AU - Forster, Karl

AU - Friedman, Peter G.

AU - Martin, D. Christopher

AU - Morrissey, Patrick

AU - Neff, Susan G.

AU - Schiminovich, David

AU - Seibert, Mark

AU - Small, Todd

AU - Wyder, Ted K.

AU - Donas, José

AU - Heckman, Timothy M.

AU - Lee, Young-Wook

AU - Milliard, Bruno

AU - Rich, R. Michael

AU - Szalay, Alex S.

AU - Welsh, Barry Y.

AU - Yi, Sukyoung

PY - 2007/12/1

Y1 - 2007/12/1

N2 - We have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Here 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 catalog 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 (≳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 (∼10% incidence) exhibit an exceptionally large, UV-bright/optically low surface brightness (LSB) zone having blue UV-Ks outside the effective extent of the inner, older stellar population, but not reaching extreme galactocentric distance. If the activity occurring 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 (currently low) stellar mass in the next Gyr (assuming a constant star formation 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.

AB - We have initiated a search for extended ultraviolet disk (XUV-disk) galaxies in the local universe. Here 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 catalog 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 (≳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 (∼10% incidence) exhibit an exceptionally large, UV-bright/optically low surface brightness (LSB) zone having blue UV-Ks outside the effective extent of the inner, older stellar population, but not reaching extreme galactocentric distance. If the activity occurring 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 (currently low) stellar mass in the next Gyr (assuming a constant star formation 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.

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Thilker DA, Bianchi L, Meurer G, De Paz AG, Boissier S, Madore BF et al. A search for Extended Ultraviolet Disk (XUV-disk) galaxies in the local universe. Astrophysical Journal, Supplement Series. 2007 Dec 1;173(2):538-571. https://doi.org/10.1086/523853