[52.03] The Galaxy Color-Magnitude Diagram in the Local Universe from GALEX and SDSS Data

AAS 207th Meeting, 8-12 January 2006
Session 52 Galaxy Surveys
Oral, Monday, 2:30-4:00pm, January 9, 2006, Delaware B

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[52.03] The Galaxy Color-Magnitude Diagram in the Local Universe from GALEX and SDSS Data

T. K. Wyder (Caltech), GALEX Science Team

We present the relative density of galaxies in the local universe as a function of their r-band absolute magnitudes and ultraviolet minus r-band colors. The Sloan Digital Sky Survey (SDSS) main galaxy sample selected in the r-band was matched with a sample of galaxies from the Galaxy Evolution Explorer (GALEX) Medium Imaging Survey in both the far-UV (FUV) and near-UV (NUV) bands. Simlar to previous optical studies, the distribution of galaxies in (FUV-r) and (NUV-r) is bimodal with well-defined blue and red sequences. We compare the distribution of galaxies in these colors with both the D₄₀₀₀ index measured from the SDSS spectra as well as the SDSS (u-r) color.

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