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The Intrinsic Ellipticity of Spiral Disks | David R. Andersen
; Matthew A. Bershady
; | Date: |
24 Dec 2001 | Subject: | astro-ph | Affiliation: | MPIA), Matthew A. Bershady (UW-Madison | Abstract: | We 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 | Services: | Forum | Review | PDF | Favorites |
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