Recent star formation in nearby galaxies from Galaxy Evolution Explorer imaging: M101 and M51

Luciana Bianchi, David A. Thilker, Denis Burgarella, Peter G. Friedman, Charles G. Hoopes, Samuel Boissier, Armando Gil De Paz, Tom A. Barlow, Yong Ik Byun, Jose Donas, Karl Forster, Timothy M. Heckman, Patrick N. Jelinsky, Young Wook Lee, Barry F. Madore, Roger F. Malina, D. Christopher Martin, Bruno Milliard, Patrick Morrissey, Susan G. NeffR. Michael Rich, David Schiminovich, Oswald H.W. Siegmund, Todd Small, Alex S. Szalay, Barry Y. Welsh, Ted K. Wyder

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


The Galaxy Evolution Explorer (GALEX) 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 Sloan Digital Sky Survey optical data in five bands. The multiband 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 ≈ 160 pc scale. A galactocentric gradient of the far-UV/near-UV color indicates younger stellar populations toward the outer parts of the galaxy disks, the effect being more pronounced in M101 than in M51.

Original languageEnglish
Pages (from-to)L71-L74
JournalAstrophysical Journal
Issue number1 II
Publication statusPublished - 2005 Jan 20

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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