The outermost cluster of M31

Abstract

We report on the identification of a new cluster in the far halo of the M31 galaxy. The cluster, named Bologna 514 (B514) has an integrated magnitude M_V=-8.5 +- 0.6, and a radial velocity, as estimated from two independent low-resolution spectra, V_r=-456 +- 23 km/s, which fully confirms its membership to the M31 system. The observed integrated spectrum is very similar to those of classical globular clusters. Being located at ~ 4^o (~55 kpc in projected distance) from the center of the parent galaxy, B514 is by far the most remote M31 cluster ever discovered. Its projected position, near the galaxy major axis, and M31-centric velocity, similar to that observed in the outermost regions of the HI rotation curve, may indicate that it belongs to the subsystem of M31 clusters that has been recently proposed (Morrison et al. 2004) to be part of the dynamically-cold thin disc of the galaxy.

6 pages, 4 figures, accepted for publication in A & A

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• ACS photometry of newly-discovered globular clusters in the outer halo of M31
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• ACS photometry of the globular cluster B514
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