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The Mass Distribution in Disk Galaxies

Published online by Cambridge University Press:  27 October 2016

Stéphane Courteau  and
Aaron A. Dutton
Stéphane Courteau
Affiliation:
Department for Physics, Engineering Physics and Astrophysics Queen's University, Kingston, ON K7L 3N6, Canada email: [email protected]
Aaron A. Dutton
Affiliation:
Max-Planck-Institut für Astronomie Königstuhl 17, D-69117 Heidelberg, Germany email: [email protected]
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Abstract

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We present the relative fraction of baryons and dark matter at various radii in galaxies. For spiral galaxies, this fraction measured in a galaxy's inner parts is typically baryon-dominated (maximal) and dark-matter dominated (sub-maximal) in the outskirts. The transition from maximal to sub-maximal baryons occurs within the inner parts of low-mass disk galaxies (with Vtot ≤ 200 km s−1) and in the outer disk for more massive systems. The mean mass fractions for late- and early-type galaxies vary significantly at the same fiducial radius and circular velocity, suggesting a range of galaxy formation mechanisms. A more detailed discussion, and resolution of the so-called “maximal disk problem”, is presented in Courteau & Dutton, ApJL, 801, 20.

Keywords

galaxies: kinematics and dynamicsgalaxies: spiralgalaxies: dark mattergalaxies: baryons
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , General Assembly A29B: Astronomy in Focus , August 2015 , pp. 195 - 196
Copyright
Copyright © International Astronomical Union 2016 

References

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