M31's Disk System of Globular Clusters

Details M31's Disk System of Globular Clusters M31's Disk System of Globular Clusters

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..165m&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

Globular cluster systems are often associated with violent formation events such as the galaxy mergers or the formation of large bulges. However formation in relatively ordered regions such as thin disks may also be an important process which has been overlooked.
Recent high-quality spectroscopic studies of the M31 globulars show that a significant number of the clusters seen projected on its disk belong to a rapidly rotating thin disk. This contrasts strongly with the Milky Way system which is composed of a halo and thick disk system and has no known thin disk globulars. M31's disk may have been more efficient at forming disk globulars than the Milky Way's. It is also likely that M31 has experienced no minor mergers since the globular cluster formation epoch as such a merger would have heated the globulars into a thick disk system. The metallicity and luminosity distribution of the disk and non-disk clusters are quite similar. I will discuss implications for disk formation timescales.

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