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The Colors of Dwarf Elliptical Galaxy Globular Cluster Systems, Nuclei and Stellar Halos | | Jennifer M. Lotz
; Bryan W. Miller
; Henry C. Ferguson
; | | Date: |
31 May 2004 | | Journal: | Astrophys.J. 613 (2004) 262-278 | | Subject: | astro-ph | | Affiliation: | UC Santa Cruz), Bryan W. Miller (Gemini Observatory), and Henry C. Ferguson (STScI | | Abstract: | We present the results of a Hubble Space Telescope WFPC2 F555W and F814W survey of 69 dwarf elliptical galaxies (dEs) in the Virgo and Fornax Clusters and Leo Group. The $V-I$ colors of the dE globular clusters, nuclei, and underlying field star populations are used to trace the dE star-formation histories. We find that the dE globular cluster candidates are as blue as the metal-poor globular clusters of the Milky Way. The observed correlation of the dE globular cluster systems’ $V-I$ color with the luminosity of the host dE is strong evidence that the globular clusters were formed within the the halos of dEs and do not have a pre-galactic origin. Assuming the majority of dE clusters are old, the mean globular cluster color- host galaxy luminosity correlation implies a cluster metallicity $-$ galaxy luminosity relation of $Z_{GC} propto L_B^{0.22 pm 0.05}$, which is significantly shallower than the field star metallicity - host galaxy luminosity relationship observed in Local Group dwarfs ($Z_{FS} propto L^{0.4}$). The dE stellar envelopes are $0.1-0.2$ magnitudes redder in $V-I$ than their globular clusters and nuclei. This color offset implies separate star-formation episodes within the dEs for the clusters and field stars, while the very blue colors of two dE nuclei trace a third star-formation event in those dEs less than a Gyr ago. | | Source: | arXiv, astro-ph/0406002 | | Services: | Forum | Review | PDF | Favorites | |
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