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For refcode 2002ApJ...568..174M:
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2002ApJ...568..174M Globular Cluster Systems in Elliptical Galaxies of Coma A. Marin-Franch and A. Aparicio Instituto de Astrofisica de Canarias, E-38205 La Laguna, Tenerife, Spain; aaj@ll.iac.es, amarin@ll.iac.es Received 2001 May 3; accepted 2001 November 26 ABSTRACT Globular cluster systems of 17 elliptical galaxies have been studied in the Coma Cluster of galaxies. Surface-brightness fluctuations have been used to determine total populations of globular clusters, and specific frequency (S_N_) has been evaluated for each individual galaxy. Enormous differences in S_N_ between similar galaxies are found. In particular, S_N_ results vary by an order of magnitude from galaxy to galaxy. Extreme cases are the following: (1) at the lower end of the range, NGC 4673 has S_N_ = 1.0 +/- 0.4, a surprising value for an elliptical galaxy, but typical for spiral and irregular galaxies; (2) at the upper extreme, MCG +5-31-063 has S_N_ = 13.0 +/- 4.2 and IC 4051 has S_N_ = 12.7 +/- 3.2, and they are more likely to belong to supergiant cD galaxies than to "normal" elliptical galaxies. Furthermore, NGC 4874, the central supergiant cD galaxy of the Coma Cluster, also exhibits a relatively high specific frequency (S_N_ = 9.0 +/- 2.2). The other galaxies studied have S_N_ in the range [2, 7], the mean value being S_N_ = 5.1. No single scenario seems to account for the observed specific frequencies, so the history of each galaxy must be deduced individually by suitably combining the different models (in situ, mergers, and accretions). The possibility that Coma is formed by several subgroups is also considered. If only the galaxies of the main subgroup defined by Gurzadyan & Mazure are used, a trend in S_N_ arises in the sense of S_N_ being bigger in higher-density regions. This result needs further confirmation. Subject headings: galaxies: clusters: individual (Coma) - galaxies: star clusters - globular clusters: general
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