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Radial Distributions of Dark and Luminous Matter in Bright Spiral Galaxies

Published online by Cambridge University Press:  26 May 2016

Susan A. Kassin
Affiliation:
Department of Astronomy, the Ohio State University, 140 W. 18th Ave., Columbus, OH 43210-1173, USA
Roelof S. De Jong
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Richard W. Pogge
Affiliation:
Department of Astronomy, the Ohio State University, 140 W. 18th Ave., Columbus, OH 43210-1173, USA

Abstract

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We present a work in progress investigating the radial distributions of dark and luminous matter in local bright spiral galaxies spanning a range of Hubble types. the distributions are derived from multiband imaging (BVRJHK) predominately from the Ohio State University Bright Spiral Galaxy Survey (OSUBSGS) and rotation curves from the literature. We use stellar colour-MIL relationships from Bell & de Jong (2001, ApJ, 550, 212) to create radial stellar mass surface density profiles for each of our galaxies. These profiles are used to create rotation curves for the stellar component; gas masses are derived from HI when available. the resulting stellar and gas mass rotation curves are compared to observed (total mass) rotation curves, and the rotation due to dark matter is determined for each galaxy. Fits to Navarro, Frenk, & White (1996, ApJ, 462, 563; NFW) halo profiles are shown. We present this analysis for 2 example galaxies from our sample of nearly 50. We will use this data to investigate correlations between these mass components and physical properties of galaxies.

Type
Part 9: Disks
Copyright
Copyright © Astronomical Society of the Pacific 2004