Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...535l..95s&link_type=abstract
The Astrophysical Journal, Volume 535, Issue 2, pp. L95-L98.
Astronomy and Astrophysics
Astronomy
7
Galaxies: Individual: Messier Number: M31, Galaxy: Globular Clusters: General
Scientific paper
We found a subsystem of globular clusters in M31 that appears to have a formation history separate from the rest. The member clusters of this subsystem, identified from their distinct distribution in the metallicity-distance diagram, (1) have a common medium metallicity range of -0.9<[Fe/H]<-0.4, (2) have a line-of-sight velocity distribution with no significant projected rotational motion, and (3) are populated outside the inner subsystem of globular clusters of similar metallicity that shows a significant net rotational motion as a whole. We suggest that this subsystem of globular clusters was formed during a merging event of a dwarf galaxy that took place well after the initial collapse event when most of the globular clusters in M31 were formed.
Iye Masanori
Saito Yoshihiko
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