J/ApJS/173/538 XUV-Disk galaxies in the Local Universe (Thilker+, 2007)
A search for extended ultraviolet disk (XUV-disk) galaxies in the Local Universe. Thilker D.A., Bianchi L., Meurer G., Gil De Paz A., Boissier S., Madore B.F., Boselli A., Ferguson A.M.N., Munoz-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., Small T., Wyder T.K., Donas J., Heckman T.M., Lee Y.-W., Milliard B., Rich R.M., Szalay A.S., Welsh B.Y., Yi S.K. <Astrophys. J. Suppl. Ser., 173, 538-571 (2007)> =2007ApJS..173..538T
ADC_Keywords: Galaxies, nearby ; Ultraviolet Keywords: galaxies: evolution - ultraviolet: galaxies 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<40Mpc) S0-Sm galaxies included in the GALEX Atlas of Nearby Galaxies (Gil de Paz et al. 2007, Cat. J/ApJS/173/185) 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. Description: GALEX obtained FUV and NUV direct imaging observations of our sample targets during primary mission surveys, principally the Nearby Galaxy Survey (NGS; Bianchi et al. 2003, in The Local Group as an Astrophysical Laboratory, ed. M. Livio & T. Brown (Baltimore: STScI), 10) and Medium Imaging Survey (MIS; Martin et al., 2005ApJ...619L...1M). Second-generation Digitial Sky Survey (DSS-II) imaging data were used for compared GALEX imagery to the visible morphology of targets. We obtained Sloan Digital Sky Survey (SDSS) DR5 ugriz imagery of confirmed XUV-disk objects whenever possible. 2MASS Large Galaxy Atlas (LGA; Jarrett et al., 2003AJ....125..525J) was our preferred source for Ks data. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 88 189 40Mpc Disk Galaxy Sample table2.dat 89 54 XUV-Disk Classification Results
See also: J/AJ/106/530 : Low surface brightness disk galaxies (Bothun+, 1993) J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007) J/ApJS/173/441 : UV-Luminous galaxies discovered by GALEX (Hoopes+, 2007) J/A+A/478/353 : Structural properties of disk galaxies (Mendez-Abreu+, 2008) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name (NGC, UGC, IC or ESO) 14 A1 --- n_Name [*] Different name used (1) 16- 19 F4.1 --- T Morphology 21- 23 F3.1 --- e_T Uncertainty in T 25- 28 F4.1 Mpc Dist Distance (2) 30- 33 F4.1 arcmin D25 Diameter at 25mag/arcsec2 35- 40 F6.3 [solMass/yr] logSFR Log of star formation rate (3) 42- 47 F6.2 [yr-1] logsSFR Log of specific star formation rate 49- 53 F5.2 [solMass/yr/kpc2] logSig Log star formation surface density 55- 59 F5.2 [solMass] logMHI ? Log of the HI mass 61- 65 F5.2 [Sun] logM/L ? Log of HI mass to B band luminosity 67- 69 I3 --- Ngrp ? Number of galaxies in associated NOG group (from Giuricin et al. 2000, Cat. J/ApJ/543/178) 71- 82 A12 --- NOG Brightest galaxy in associated NOG group, or group name (when available) 84- 88 F5.2 --- f ? Tidal perturbation parameter (4)
Note (1): the asterisk (*) indicates a different name in Gil de Paz et al. (2007, Cat. J/ApJS/173/185) Note (2): From the Virgo-infall corrected radial velocity adopting H0=70km/s/Mpc, except as noted in Gil de Paz et al. (2007, Cat. J/ApJS/173/185). Note (3): SFR estimates are derived jointly from TIR and UV luminosities, adopting the calibration of Kennicutt (1998ARA&A..36..189K) without any correction for the fractional contribution of diffuse IR emission unrelated to present star formation. Note (4): parameter computed following Varela et al. 2004A&A...420..873V: galaxies with f←4.5 may be considered as "isolated" (tidally unaffected in the recent past); galaxies with f>-2.0 are "perturbed".
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 12 A12 --- Name Object name (NGC, UGC, IC or ESO) 14 A1 --- T1 [YN] Type 1 XUV-disks assessment (2) 16- 18 A3 --- n_T1 [FUV NUV] In which band Type 1 XUV-disk 20- 25 F6.1 kpc2 S(K80) ?=- Area enclosed by Ks contour 27- 32 F6.1 kpc2 S(UV) ?=- Area enclosed by UV contour 34- 38 F5.2 --- S(LSB)/S(K80) ?=- Distribution of relative size 40- 43 F4.1 mag UV-Ks ?=- UV(AB)-K_s_(AB) color index (1) 45 A1 --- T2 [YN] Type 2 XUV-disks assessment (2) 47- 89 A43 --- Comm Interaction comment
Note (1): Colors measured within the low surface brightness (LSB) zone, UV(AB)-Ks(AB), have been corrected for Galactic extinction. Note (2): XUV-disk galaxies are classified as: * Type 1: show structured, UV-bright emission complexes beyond the anticipated location of the star formation threshold; * Type 2: have blue (FUV-NIR) color withing an exceptionally large, outer and optically-LSB portion of the disk. Mixed-type XUV-disks have a "Y" in the Assessment column for both criteria.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 27-May-2009
|The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line|