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Title:
Constraints on the merger models of elliptical galaxies from their globular cluster systems
Authors:
Kissler-Patig, Markus; Forbes, Duncan A.; Minniti, Dante
Affiliation:
AA(Lick Observatory, University of California, Santa Cruz, CA 95064, USA), AB(School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT), AC(Lawrence Livermore National Laboratory, Livermore, CA 94550, USA)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 4, pp. 1123-1132. (MNRAS Homepage)
Publication Date:
08/1998
Origin:
MNRAS
MNRAS Keywords:
GALAXIES: ELLIPTICAL AND LENTICULAR, CD, GALAXIES: INTERACTIONS, GALAXIES: STAR CLUSTERS
DOI:
10.1046/j.1365-8711.1998.01725.x
Bibliographic Code:
1998MNRAS.298.1123K

Abstract

The discovery of protoglobular cluster candidates in many present-day mergers allows us to understand better the possible effects of a merger event on the globular cluster system of a galaxy, and to foresee the properties of the end-product. By comparing these expectations with the properties of globular cluster systems of elliptical galaxies at the present time we can constrain merger models. The observational data indicate that (i) every gaseous merger induces the formation of new star clusters, and (ii) the number of new clusters formed in such a merger increases with the gas content of the progenitor galaxies. Low-luminosity (about M_V>-21), discy ellipticals are generally thought to be the result of a gaseous merger. As such, new globular clusters are expected to form but have not been detected to date. We investigate various reasons for the non-detection of subpopulations in low-luminosity ellipticals, i.e. absence of an old population, absence of a new population, destruction of one of the populations and, finally, an age-metallicity conspiracy that allows old and new globular clusters to appear indistinguishable at the present epoch. All of these possibilities lead us to a similar conclusion, namely that low-luminosity ellipticals did not form recently (z<1) in a gas-rich merger, and might not have formed in a major merger of stellar systems at all. High-luminosity ellipticals do reveal globular cluster subpopulations. However, it is difficult to account for the two populations in terms of mergers alone and, in particular, we can rule out scenarios in which the second subpopulation is the product of a recent, gas-poor merger.

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