Abstract.
We present preliminary results of 2dF spectroscopy of globular clusters in The Sombrero (M104). We find 56 new clusters, and compile a total sample of 103 velocities combined with previous data. Our 2dF data extend out to 20 arcmin radius (\(\sim 50\) kpc), much further than previous studies. In the combined sample, we tentatively find a steep drop in the velocity dispersion with radius, which might possibly indicate a truncated halo. There is no obvious solid-body rotation over all radii, but separate fits for those clusters inside and outside 25 kpc radius show tantalizing evidence for counter-rotation. The projected mass estimator with isotropic orbits yields an M104 mass of 1.2 x 1012M\(_\odot\) inside 50 kpc, and a (M/L) B = 30: solid evidence for a dark matter halo in this galaxy.
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Bridges, T., Freeman, K., Rhode, K., Zepf, S. 2dF Spectroscopy of M104 Globular Clusters. In: Kissler-Patig, M. (eds) Extragalactic Globular Cluster Systems. ESO ASTROPHYSICS SYMPOSIA. Springer, Berlin, Heidelberg. https://doi.org/10.1007/10857603_47
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DOI: https://doi.org/10.1007/10857603_47
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Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-40472-9
Online ISBN: 978-3-540-45044-3
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