2007/09/27 by Myung Gyoon Lee, Ho Seong Hwang, Hong Soo Park +13 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Star Formation Studies #Elliptical galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Globular cluster #Photometry (optics) #Physics #Radial velocity #Red-giant branch #Spectral line #Spectrograph #Stars #Stellar, planetary, and galactic studies #Velocity dispersion #Virgo Cluster #astro-ph
paper · pdf · doi:10.1086/522956
29 pages, 8 figures. To appear in ApJ
arxiv created 2007/09/27 · openalex publication_date 2008/02/15 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We present radial velocity measurements for globular clusters in M60, a giant elliptical galaxy in the Virgo Cluster. Target globular cluster candidates were selected using Washington photometry based on deep 16 ' × 16 ' images taken at the KPNO 4 m telescope and using VI photometry derived from Hubble Space Telescope WFPC2 archival images. The spectra of the target objects were obtained with the Multi-Object Spectrograph at the Canada-France-Hawaii Telescope. We have measured the radial velocities of 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with 1.0 ≤ C – T 1 < 1.7, and 21 red globular clusters with 1.7 ≤ C – T 1 < 2.4), 11 foreground stars, six small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from ~500 to ~1600 km s −1 , with a mean value of 1070 + 27 −25 km s −1 , which is in good agreement with the velocity of the nucleus of M60 ( v gal = 1056 km s −1 ). Combining our results with data from the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the clusters in the master catalog is found to be 234 + 13 −14 km s −1 for the entire sample, 223 + 13 −16 km s −1 for 83 blue globular clusters, and 258 + 21 −31 km s −1 for 38 red globular clusters.