The Globular Cluster System of M60 (NGC 4649). I. CFHT MOS Spectroscopy and Database

Abstract

We present the measurement of radial velocities for globular clusters in M60, giant elliptical galaxy in the Virgo cluster. Target globular cluster candidates were selected using the Washington photometry based on the deep $16\arcmin \times 16\arcmin$ images taken at the KPNO 4m and using the $VI$ photometry derived from the HST/WFPC2 archive images. The spectra of the target objects were obtained using the Multi-Object Spectrograph (MOS) at the Canada-France-Hawaii Telescope (CFHT). We have measured the radial velocity for 111 objects in the field of M60: 93 globular clusters (72 blue globular clusters with $1.0\le (C-T_1)<1.7$ and 21 red globular clusters with $1.7\le (C-T_1)<2.4$), 11 foreground stars, 6 small galaxies, and the nucleus of M60. The measured velocities of the 93 globular clusters range from $\sim 500$ km s${}^{-1}$ to $\sim 1600$ 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 ($v_{\mathrm{gal}}=1056$ km s${}^{-1}$). Combining our results with data in the literature, we present a master catalog of radial velocities for 121 globular clusters in M60. The velocity dispersion of the globular 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.

29 pages, 8 figures. To appear in ApJ

References in corpus (6)

• The ACS Virgo Cluster Survey. XIV. Analysis of Color-Magnitude Relations in Globular Cluster Systems
• The Kinematics and Dynamics of the Globular Clusters and the Planetary Nebulae of NGC 5128
• The Globular Cluster System of M60 (NGC 4649). II. Kinematics of the Globular Cluster System
• The Globular Cluster Kinematics and Galaxy Dark Matter Content of NGC 4649 (M60)
• Dynamics of the NGC 4636 Globular Cluster System - An extremely dark matter dominated galaxy?
• Gemini/GMOS Spectra of Globular Clusters in the Virgo Giant Elliptical NGC 4649

Cited by in corpus (9)

• Deep Chandra Monitoring Observations of NGC 4278: Catalog of Source Properties
• A SLUGGS and Gemini/GMOS combined study of the elliptical galaxy M60: wide-field photometry and kinematics of the globular cluster system
• The globular cluster system of NGC1316. III. Kinematic complexity
• Study of gravitational fields and globular cluster systems of early-type galaxies
• Spatial Structures In the Globular Cluster Distribution of the Ten Brightest Virgo Galaxies
• Resolving the Discrepancy of Distance to M60, a Giant Elliptical Galaxy in Virgo
• Nonlinear Color-Metallicity Relations of Globular Clusters. IX. Different Radial Number Density Profiles between Blue and Red Clusters
• Nonlinear Color-Metallicity Relations of Globular Clusters. X. Subaru/FOCAS Multi-object Spectroscopy of M87 Globular Clusters
• The total mass of the early-type galaxy NGC 4649 (M60)