2dF Spectroscopy of Globular Clusters in M104

Details 2dF Spectroscopy of Globular Clusters in M104 2dF Spectroscopy of Globular Clusters in M104

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..199b&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

We present results of 2dF spectroscopy of globular clusters in the Sombrero galaxy (M104). Combined with previous data we now have a total sample of ~100 radial velocities. Our 2dF data extend out to 20 arcmin radius (~50 kpc) much further than previous studies. In the combined sample we find a steep drop in the velocity dispersion with radius which could indicate a truncated halo. There is no significant solid-body rotation over all radii but separate fits for clusters inside and outside 25 kpc show hints of counter-rotation. The projected mass estimator yields a mass for M104 of 1.2x1012 solar masses inside 50 kpc and (M/L)B = 30 which is evidence for a dark matter halo in this galaxy.

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