Systematics of the Ultraviolet Rising flux in a GALEX/SDSS sample of Early-type Galaxies

R. M. Rich; S. Salim; J. Brinchmann; S. Charlot; M. Seibert; G. Kauffmann; Y-W. Lee; S. K. Yi; T. A. Barlow; L. Bianchi; J. Donas; K. Forster; P. G. Friedman; T. M. Heckman; P. N. Jelinsky; B. F. Madore; R. F. Malina; D. C. Martin; B. Milliard; P. Morrissey; S. G. Neff; D. Schiminovich; O. H. W. Siegmund; T. Small; A. S. Szalay; B. Y. Welsh; T. K. Wyder

doi:10.1086/426939

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arXiv · astro-ph/0411356

Systematics of the Ultraviolet Rising flux in a GALEX/SDSS sample of Early-type Galaxies

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Abstract

We present ultraviolet photometry for a sample of morphologically early-type galaxies selected by matching the Sloan Digital Sky Survey Data Release 1 with the GALEX Medium and All-sky Imaging Surveys. We obtain a working sample of 1032 early-type galaxies with GALEX FUV detections, SDSS spectroscopy, and $z<0.2$. Using the SDSS spectra to identify galaxies with even weak star formation or evidence of AGN, and further removing galaxies with any evidence of non early-type morphology, we derive a final sample of 172 red quiescent early-type galaxies. We find that the $FUV-r$ color has a full range of 5 mag. Plotting against the $FUV-r$ color the metallicity sensitive Lick $\rm Mg_2$ and D4000 indices, and the stellar velocity dispersion, we find no correlation between our measurement of UV rising flux, and any parameter sensitive to metallicity.

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R. M. Rich, S. Salim, J. Brinchmann, S. Charlot, M. Seibert, G. Kauffmann, Y-W. Lee, S. K. Yi, T. A. Barlow, L. Bianchi, J. Donas, K. Forster, P. G. Friedman, T. M. Heckman, P. N. Jelinsky, B. F. Madore, R. F. Malina, D. C. Martin, B. Milliard, P. Morrissey, S. G. Neff, D. Schiminovich, O. H. W. Siegmund, T. Small, A. S. Szalay, B. Y. Welsh, T. K. Wyder. 2004-11-12. Systematics of the Ultraviolet Rising flux in a GALEX/SDSS sample of Early-type Galaxies. https://doi.org/10.1086/426939

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