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Date and Time of the Query: 2019-03-21 T02:28:43 PDT
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For refcode 2007ApJS..173..597D:
Retrieve 130 NED objects in this reference.
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJS..173..597D GALEX UV Color Relations for Nearby Early-Type Galaxies Donas, Jose; Deharveng, Jean-Michel; Rich, R. Michael; Yi, Sukyoung K.; Lee, Young-Wook; Boselli, Alessandro; Gil de Paz, Armando; Boissier, Samuel; Charlot, Stephane; Salim, Samir; Bianchi, Luciana; Barlow, Tom A.; Forster, Karl; Friedman, Peter G.; Heckman, Timothy M.; Madore, Barry F.; Martin, D. Christopher; Milliard, Bruno; Morrissey, Patrick; Neff, Susan G.; Schiminovich, David; Seibert, Mark; Small, Todd; Szalay, Alex S.; Welsh, Barry Y.; Wyder, Ted K. Abstract. We use GALEX/optical photometry to construct color-color relationships for early-type galaxies sorted by morphological type. We have matched objects in the GALEX GR1 public release and the first IR1.1 internal release, with the RC3 early-type galaxies having a morphological type -5.5<=T<-1.5, with mean error on T<1.5 and mean error on (B-V)_T_<0.05. After visual inspection of each match, we are left with 130 galaxies with reliable GALEX pipeline photometry in the far-UV and near-UV bands. This sample is divided into ellipticals (-5.5<=T<-3.5) and lenticulars (-3.5<=T<-1.5). After correction for Galactic extinction, the color-color diagrams FUV-NUV versus (B-V)_Tc_ are plotted for the two subsamples. We find a tight anticorrelation between the FUV-NUV and (B-V)_Tc_ colors for ellipticals, with the UV color getting bluer when the (B-V)_Tc_ gets redder. This relationship very likely is an extension of the color-metallicity relationship in the GALEX NUV band. We suspect that the main source of the correlation is metal line blanketing in the NUV band. The FUV-NUV versus B-V correlation has larger scatter for lenticular galaxies; we speculate that this reflects the presence of low-level star formation. If the latter objects (i.e., those that are blue both in FUV-NUV and in B-V) are interpreted as harboring recent star formation activity, this would be the case for a few percent (~4%) of ellipticals and ~15% of lenticulars; this would mean about 10% of early-type galaxies have residual star formation in our full sample of 130 early-type galaxies. We also plot FUV-NUV versus the Mg_2_ index and central velocity dispersion. We find a tight anticorrelation between FUV-NUV and the Mg_2_ index; we suspect that this reflects blanketing in the NUV band being correlated with overall metallicity. We find a marginal anticorrelation of FUV-V_T_ with Mg_2_ for elliptical galaxies. Key words: Galaxies: Elliptical and Lenticular, cD, Galaxies: Photometry, Galaxies: Stellar Content, Ultraviolet: Galaxies
Retrieve 130 NED objects in this reference.
Please click here for ADS abstract

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