NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-18 T09:15:30 PDT
Help | Comment | NED Home

For refcode 1990AJ.....99.1823M:
Retrieve 47 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1990AJ.....99.1823M SPECTROSCOPY OF GLOBULAR CLUSTERS IN M87 AND M49 J. R. MOULD AND J. B. OKE Palomar Observatory, California Institute of Technology, Robinson Lab 105-24, Pasadena, California 91125 P. T. DE ZEEUW Theoretical Astrophysics, Caltech, Pasadena, California 91125 J. M. NEMEC University of British Columbia, Vancouver, British Columbia V6T 1W5, Canada Received 15 December 1989; revised 21 February 1990 ABSTRACT Optical multislit spectra of globular clusters in two giant elliptical galaxies in the Virgo Cluster indicate average metal abundances of one- sixth and one-tenth solar composition for M49 and M87, respectively. These estimates are based on the strength of Mg lines. Taken together with observations of globular clusters in dwarf ellipticals this suggests a direct relation between mean metallicity of the cluster system and the luminosity of the parent galaxy which is an interesting constraint on theories of cluster formation during the protogalactic epoch. Rotation is evident in both globular cluster systems. The line-of-sight velocity dispersions of clusters in the two galaxies are estimated to be 340 +/- 50 km/s (M49) and 386 +/- 42 km/s (M87). Although sparsely sampled, the velocity dispersion profiles of the cluster systems are flat, suggesting the existence of an isothermal halo of dark matter in these ellipticals. A constant mass-to-light ratio can only be ruled out in the case of M87, however.
Retrieve 47 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home