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 - T1 < 1.7, and 21 red globular clusters with 1.7 ≤ C - T1 < 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 -25+27 km s-1, which is in good agreement with the velocity of the nucleus of M60 (vgal = 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 234-14 +13 km s-1 for the entire sample, 223-16 +13 km s-1 for 83 blue globular clusters, and 258 -31+21 km s-1 for 38 red globular clusters.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science