Mergers, Accretions, and the Globular Cluster Mean Metallicity-Number per Unit Mass Relation

Details Mergers, Accretions, and the Globular Cluster Mean Metallicity-Number per Unit Mass Relation Mergers, Accretions, and the Globular Cluster Mean Metallicity-Number per Unit Mass Relation

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...454..762p&link_type=abstract

Astrophysical Journal v.454, p.762

Astronomy and Astrophysics

Astronomy

10

Galaxies: Abundances, Galaxies: Elliptical And Lenticular, Cd, Galaxies: Fundamental Parameters, Galaxies: Star Clusters, Galaxy: Globular Clusters: General

Scientific paper

Elliptical galaxies are shown to fall off the relation between mean globular cluster metallicity and galaxy mass, as defined by dwarf, irregular, and spiral galaxies. This implies that globular clusters must have undergone a different enrichment history in elliptical galaxies than in other Hubble types. Considering a simple merger scenario, a natural relation is derived between mean cluster metallicity, , and the number of clusters per unit of total galaxy mass, T (defined by Ashman & Zepf in their recent work). In particular, the predicted location of spiral galaxy mergers in the log (T) diagram falls in a region occupied exclusively by elliptical galaxies. Furthermore, the efficiency of globular cluster formation in mergers appears to be akin to that of globular clusters in the disk of the Milky Way. However, the number of clusters per unit mass in the Milky Way outer halo cannot be reconciled with the accretion of dwarf galaxy systems as the dominant mechanism for contributing globular clusters there.

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