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arxiv: astro-ph/0411408 · v1 · submitted 2004-11-15 · 🌌 astro-ph

Recent star formation in nearby galaxies from GALEX imaging:M101 and M51

Luciana Bianchi (JHU) , D.Thilker , D.Burgarella , P.Friedman , C.Hoopes , S.Boissier , A.Gil de Paz , T.Barlow
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Y.-I.Byun J.Donas K.Forster T.Heckman P.Jelinsky Y-W Lee B.Madore R.Malina C.Martin B.Milliard P.Morrissey S.Neff M.Rich D.Schiminovich O.Siegmund T.Small A.Szalay B. Welsh T. Wyder
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keywords galexm101galaxiesimagingcompactcomplexesfar-uvgalaxy
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The GALEX (Galaxy Evolution Explorer) Nearby Galaxies Survey is providing deep far-UV and near-UV imaging for a representative sample of galaxies in the local universe. We present early results for M51 and M101, from GALEX UV imaging and SDSS optical data in five bands. The multi-band photometry of compact stellar complexes in M101 is compared to population synthesis models, to derive ages, reddening, reddening-corrected luminosities and current/initial masses. The GALEX UV photometry provides a complete census of young compact complexes on a approximately 160pc scale. A galactocentric gradient of the far-UV - near-UV color indicates younger stellar populations towards the outer parts of the galaxy disks, the effect being more pronounced in M101 than in M51.

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