The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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An MMT/Hectospec spectroscopic study of globular clusters in the M81 group

  • Lim, Sungsoon (Department of Astronomy, Peking University) ;
  • Sohn, Jubee (Department of Physics and Astronomy, Seoul National University) ;
  • Ko, Youkyung (Department of Physics and Astronomy, Seoul National University) ;
  • Jang, In Sung (Department of Physics and Astronomy, Seoul National University) ;
  • Lee, Myung Gyoon (Department of Physics and Astronomy, Seoul National University) ;
  • Hwang, Narae (Korea Astronomy and Space Science Institute) ;
  • Kim, Sang Chul (Korea Astronomy and Space Science Institute) ;
  • Park, Hong Soo (Korea Astronomy and Space Science Institute)
  • Published : 2015.04.10
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Abstract

We present a spectroscopic study of globular clusters in the M81 group that is one of the ideal laboratories for understanding mass assembly and evolution of galaxies, such as M81, the twin galaxy of the Milky Way, and the starburst galaxy M82, in the group environments. Spectra of about 800 globular cluster candidates are obtained using MMT/Hectospec, and about one hundred globular clusters are confirmed by their radial velocities. Based on the kinematics derived from the spectra, we have found that most globular clusters rotate around M81. We have also discovered more than ten globular clusters belonging to M82, and that their kinematics is different from that of young star clusters in the disk of M82. There are few candidates of intra-group globular clusters. We will discuss the implications of these results.

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