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28 March 2024
 
  » arxiv » astro-ph/0201406

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The Intrinsic Ellipticity of Spiral Disks
David R. Andersen ; Matthew A. Bershady ;
Date 24 Dec 2001
Subject astro-ph
AffiliationMPIA), Matthew A. Bershady (UW-Madison
AbstractWe have measured the distribution of intrinsic ellipticities for a sample of 28 relatively face-on spiral disks. We combine H-alpha velocity fields and R and I-band images to determine differences between kinematic and photometric inclination and position angles, from which we estimate intrinsic ellipticities of galaxy disks. Our findings suggest disks have a log-normal distribution of ellipticities (mean epsilon =0.06) and span a range from epsilon= 0 (circular) to epsilon=0.2. We are also able to construct a tight Tully-Fisher relation for our face-on sample. We use this to assess the contribution of disk ellipticity on the observed Tully-Fisher scatter.
Source arXiv, astro-ph/0201406
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