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GALEX UV Color-Magnitude Relations and Evidence for Recent Star Formation in Early-type Galaxies

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arxiv astro-ph/0411327 v1 pith:5R4ELPLW submitted 2004-11-12 astro-ph

S Yi , SJ Yoon , S Kaviraj , JM Deharveng , RM Rich , S Salim , A Boselli , YW Lee
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CH Ree YJ Sohn SC Rey JW Lee J Rhee L Bianchi YI Byun J Donas PG Friedman TM Heckman P Jelinsky BF Madore R Malina DC Martin B Milliard P Morrissey S Neff D Schiminovich O Siegmund T Small AS Szalay MJ Jee SW Kim T Barlow K Forster B Welsh TK Wyder
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We have used the GALEX UV photometric data to construct a first near-ultraviolet (NUV) color-magnitude relation (CMR) for the galaxies pre-classified as early-type by SDSS studies. The NUV CMR is a powerful tool for tracking the recent star formation history in early-type galaxies, owing to its high sensitivity to the presence of young stellar populations. Our NUV CMR for UV-weak galaxies shows a well-defined slope and thus will be useful for interpreting the restframe NUV data of distant galaxies and studying their star formation history. Compared to optical CMRs, the NUV CMR shows a substantially larger scatter, which we interpret as evidence of recent star formation activities. Roughly 15% of the recent epoch (z < 0.13) bright (M[r] < -22) early-type galaxies show a sign of recent (< 1Gyr) star formation at the 1-2% level (lower limit) in mass compared to the total stellar mass. This implies that low level residual star formation was common during the last few billion years even in bright early-type galaxies.

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Cited by 1 Pith paper

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