Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21534002n&link_type=abstract
American Astronomical Society, AAS Meeting #215, #340.02; Bulletin of the American Astronomical Society, Vol. 42, p.445
Astronomy and Astrophysics
Astronomy
Scientific paper
We have performed a comprehensive spectroscopic and photometric analysis of the M81 globular cluster system, using HST ACS imaging in the B, V, and I bands and 74 globular cluster spectra from Hectospec at the MMT. M81 has over 200 globular clusters, about 100 of which have spectra. The M81 globular clusters have a bimodal metallicity distribution with peaks at [Fe/H] -1.6 and -0.9, and significant rotation in all subpopulations (similar to the globular cluster system of M31) whether the subpopulations are divided by distance from the center or metallicity. The metal-rich and inner (ɜ kpc) subpopulations have the highest rotation amplitudes. The dereddened globular cluster luminosity function peaks at V 20.2, giving a distance of 3.63 Mpc using the HST Key Project GCLF calibration (absolute magnitude of -7.6), in excellent agreement with previous distance estimates. The metal-rich and metal-poor globular clusters have similar effective radii. This research was supported by the NASA grant GO-10250 from the Space Telescope Science Institute and the National Science Foundation grant AST 0507229.
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