NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-24 T08:44:34 PDT
Help | Comment | NED Home

For refcode 1994AJ....108.2087A:
Retrieve 825 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1994AJ....108.2087A VRI PHOTOMETRY OF GLOBULAR CLUSTERS IN VIRGO AND LEO ELLIPTICALS EDWARD A. AJHAR National Optical Astronomy Observatories, P.O. Pox 26732, Tucson, Arizona 85726; and the Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 Electronic mail: ajhar@noao.edu JOHN P. BLAKESLEE AND JOHN L. TONRY Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139 Electronic mail: john@ameb.mit.edu, jt@antares.mit.edu Received 1993 June 14; revised 1994 June 29 ABSTRACT We present VRI photometry for the globular cluster systems (GCS's) of ten elliptical and S0 galaxies in Virgo and Leo. We find that the V - I color (metallicity) distributions are quite different from galaxy to galaxy. One extreme is represented by NGC 4374 with a narrow, blue distribution. NGC 4472 has a very broad, uniform distribution in color, corresponding to -1.8 < [Fe/H] < +0.47. At the other extreme is NGC 4365, which is weighted towards red colors, and possibly has a peculiar luminosity function. We suggest that this variation of GCS metallicity depends on environment, with formation of high metallicity globular clusters inhibited in higher density environments. We compare color-color plots of the GCS's of these galaxies with the Milky Way GCS and with integrated isochrones. We find good agreement with the galaxies studied here except that the isochrones predict colors which are slightly too bright in the I band for metal-rich clusters. We also consider the radial GC color distributions in these galaxies. We find evidence for a V - I color gradient only in NGC 4374, in the sense of redder clusters toward the center of the galaxy but warn that possible systematic effects must be ruled out with new data. Lastly, using the surface brightness fluctuation distances to these galaxies, we find supporting evidence for the universality of the globular cluster luminosity function.
Retrieve 825 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home