Globular Clusters in M81

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Spiral Galaxy GCComparisons: Kinematics• Kinematic subpopulations exist in MW, M31, M81,possibly even M33 (Chandar et al. 2002), but noevidence of them in M104 (Bridges et al. 2007)• In MW, MR clusters rotate significantly, MP clustersrotate little; in M31, both rotate (but with lower V/ forMP)• In M81, rotation pattern similar to, but slightlystronger than, MW
Summary of Results• 62 new M81 GCs spectroscopically confirmed, morethan doubling known M81 GC sample• Marginal evidence for bimodal [Fe/H] distribution inM81, with peaks similar to MW & M31• M81 consistent with GC metallicity vs. galaxyluminosity relation• M81 GCs in general, and especially MR & innerones, show evidence of rotation• Evidence for Metallicity Gradient among MP M81GCs• Metallicity-luminosity relations & MP metallicitygradient suggest link between early GC formationprocesses & gravitational potential well of eventualhost galaxy
Page 1 and 2: Spectroscopy of M81 GlobularCluster
Page 3 and 4: Why study GCs in M81?• GC systems
Page 5: Metallicity Analysis Methodology•
Page 8 and 9: M81 Spectroscopy - Metallicity Hist
Page 10 and 11: M81 Spectroscopy - GC Rotation Curv
Page 12 and 13: M81 GC Metallicity GradientM81M31Mi
Page 16: Acknowledgments• Collaborator and

Globular Clusters in M81

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