When did M31's disk form?

Details When did M31's disk form? When did M31's disk form?

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10407m&link_type=abstract

HST Proposal ID #10407

Computer Science

Hst Proposal Id #10407 Stellar Populations

Scientific paper

The recent discovery of THIN disk globular clusters in M31 provides a unique opportunity to determine the age of M31's disk. The globular cluster kinematics imply that the disk has not been significantly heated or destroyed by a merger since they were formed. Thus the cluster ages provide a lower limit to the disk age. This limit will complement the high-redshift data, where few disk galaxies are currently known because of their relatively low surface brighness. We propose to obtain BV ACS imaging of seven disk clusters to below the level of the horizontal branch {HB} to determine the distribution of evolved stars in the color-magnitude diagram. The contribution of evolved stars, particularly blue HB stars, is crucial to estimating the age of the globular cluster from both color-magnitude diagrams and the high S/N integrated spectra which we will obtain from the ground.

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