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Mass distributions in disk galaxies

Published online by Cambridge University Press:  21 March 2017

Thomas Martinsson ,
Marc Verheijen ,
Matthew Bershady ,
Kyle Westfall ,
David Andersen  and
Rob Swaters
Thomas Martinsson
Affiliation:
Instituto de Astrofísica de Canarias (IAC), La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain
Marc Verheijen
Affiliation:
Kapteyn Astronomical Institute, Univ. of Groningen, Groningen, The Netherlands
Matthew Bershady
Affiliation:
Department of Astronomy, University of Wisconsin, Madison, USA
Kyle Westfall
Affiliation:
Institute of Cosmology and Gravitation, Univ. of Portsmouth, Portsmouth, UK
David Andersen
Affiliation:
NRC Herzberg Astronomy and Astrophysics, Victoria, British Columbia, Canada
Rob Swaters
Affiliation:
Department of Astronomy, University of Maryland, College Park, USA
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Abstract

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We present results on luminous and dark matter mass distributions in disk galaxies from the DiskMass Survey. As expected for normal disk galaxies, stars dominate the baryonic mass budget in the inner region of the disk; however, at about four optical scale lengths (hR) the atomic gas starts to become the dominant contributor. Unexpectedly, we find the total baryon to dark-matter fraction within a galaxy stays nearly constant with radius from 1hR out to at least 6hR, with a baryon fraction of 15–50% among galaxies. On average, only one third of the mass within 2.2hR in a disk galaxy is baryonic and these baryons appear to have had only a minor effect on the distribution of the dark matter.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 283
Copyright
Copyright © International Astronomical Union 2017 

References

Bershady, M. A., Martinsson, T. P. K., Verheijen, M. A. W., Westfall, K. B., Andersen, D. R., & Swaters, R. A. 2011, ApJL, 739, L47 CrossRefGoogle Scholar
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