Other
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hst..prop10565g&link_type=abstract
HST Proposal ID #10565
Other
Hst Proposal Id #10565 Stellar Populations
Scientific paper
We have recently identified a previously unknown globular cluster in the M31 system that is located at 4 degrees from the center of the galaxy and in proximity {14 arcmin apart} of the major axis. This is by far the most remote M31 cluster presently known, more than 1 degree farther than any other recognized cluster. Low resolution spectra have confirmed that the object is member of M31 and its line-of-sight velocity lie approximately on the extrapolation of the HI rotation curve of the galaxy. The projected position and kynematics of the cluster strongly suggest that it may be associated with the disc of M31. If this hypothesis will be confirmed it would imply that the stellar disc of M31 extends out to 55 kpc {the projected galactocentric distance of the newly discovered object} with far reaching consequences on our ideas of the formation of galactic discs. We propose ACS/WFC observations aimed at obtaining the Color Magnitude Diagram of the cluster and its surroundig field to constrain the age and metallicity of both populations. This will provide direct indications on the actual extension and epoch of formation of the M31 disc as well as a deep insight in the stellar content of a remote region of this galaxy that has not been studied before.
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