The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Ultraviolet Properties of Dwarf Galaxies in the Ursa Major Cluster

  • Pak, Min-A (Department of Astronomy and Space Science, Chungnam National University) ;
  • Rey, Soo-Chang (Department of Astronomy and Space Science, Chungnam National University) ;
  • Kim, Suk (Department of Astronomy and Space Science, Chungnam National University) ;
  • Lee, Young-Dae (Department of Astronomy and Space Science, Chungnam National University) ;
  • Yi, Won-Hyeong (Department of Astronomy and Space Science, Chungnam National University) ;
  • Sung, Eon-Chang (Korea Astronomy and Space Science Institute) ;
  • Kyung, Jae-Mann (Korea Astronomy and Space Science Institute)
  • Published : 2010.10.06
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Abstract

We present ultraviolet (UV) properties of dwarf galaxies in the Ursa Major cluster comparing with those in the Virgo cluster. We have constructed SDSS DR7/GALEX GR5 matched optical/UV catalog for dwarf galaxies with various morphologies in these two clusters. Membership of galaxies belonging to the Ursa Major cluster was made by hierarchical grouping method using SDSS spectroscopic data. We classified morphologies of dwarf galaxies using the combination of visual inspection of the images and spectral features returned from SDSS data. In contrast to the case of the Virgo cluster, majority of dwarf galaxies in the Ursa Major cluster lies in the blue cloud of the UV color-magnitude relations (CMRs) implying strong recent or on-going star formation. We discuss the cluster environment on the star formation history and evolution of dwarf galaxies.

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