Studies of Six Nearby Galaxies: Is the Disk Mass-to-Light Ratio Constant?

Details Studies of Six Nearby Galaxies: Is the Disk Mass-to-Light Ratio Constant? Studies of Six Nearby Galaxies: Is the Disk Mass-to-Light Ratio Constant?

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396...69h&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

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Most of our understanding of dark matter halos comes from the assumption that the mass-to-light ratio of spiral disks is constant. The best way to test this assumption is to determine the disk mass surface density kinematically by measuring the stellar velocity dispersion in the direction perpendicular to the plane of face-on spiral galaxies. We have been using planetary nebulae as test particles in M 33 and five other nearby but more face-on spirals: M 74, M 83, M 94, M 101, and IC 342. Our results indicate that the mass-to-light ratio actually increases in the outer regions. We discuss the implications of our findings.

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