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 Small; Ted K. Wyder; José Donas; Timothy M. Heckman; Young Wook Lee; Bruno Milliard; R. Michael Rich; Alex S. Szalay; Barry Y. Welsh; Sukyoung K. Yi

doi:10.1086/523853

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 K. Yi

Krieger School of Arts and Sciences

Research output: Contribution to journal › Article › peer-review

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-K_s 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 language	English (US)
Pages (from-to)	538-571
Number of pages	34
Journal	Astrophysical Journal, Supplement Series
Volume	173
Issue number	2
DOIs	https://doi.org/10.1086/523853
State	Published - Dec 2007

Keywords

Galaxies: evolution
Ultraviolet: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/523853

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Thilker, D. A., Bianchi, L., Meurer, G., De Paz, A. G., Boissier, S., Madore, B. F., Boselli, A., Ferguson, A. M. N., Muńoz-Mateos, J. C., Madsen, G. J., Hameed, S., Overzier, R. A., Forster, K., Friedman, P. G., Martin, D. C., Morrissey, P., Neff, S. G., Schiminovich, D., Seibert, M., ... Yi, S. K. (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, 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, YW, Milliard, B, Rich, RM, Szalay, AS, Welsh, BY & Yi, SK 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

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

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.",

keywords = "Galaxies: evolution, Ultraviolet: galaxies",

author = "Thilker, {David A.} and Luciana Bianchi and Gerhardt Meurer and {De Paz}, {Armando Gil} and Samuel Boissier and Madore, {Barry F.} and Alessandro Boselli and Ferguson, {Annette M.N.} and Mu{\'n}oz-Mateos, {Juan Carlos} and Madsen, {Greg J.} and Salman Hameed and Overzier, {Roderik A.} and Karl Forster and Friedman, {Peter G.} and Martin, {D. Christopher} and Patrick Morrissey and Neff, {Susan G.} and David Schiminovich and Mark Seibert and Todd Small and Wyder, {Ted K.} and Jos{\'e} Donas and Heckman, {Timothy M.} and Lee, {Young Wook} and Bruno Milliard and Rich, {R. Michael} and Szalay, {Alex S.} and Welsh, {Barry Y.} and Yi, {Sukyoung K.}",

year = "2007",

month = dec,

doi = "10.1086/523853",

language = "English (US)",

volume = "173",

pages = "538--571",

journal = "Astrophysical Journal, Supplement Series",

issn = "0067-0049",

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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 K.

PY - 2007/12

Y1 - 2007/12

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.

KW - Galaxies: evolution

KW - Ultraviolet: galaxies

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

Abstract

Keywords

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