AAS 201st Meeting, January, 2003
Session 13. Galaxy - Structure
Poster, Monday, January 6, 2003, 9:20am-6:30pm, Exhibit Hall AB

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[13.09] Uncertainties in Spiral Galaxy Projection Parameters

E.I. Barnes, J.A. Sellwood (Rutgers University)

We have investigated the impact of nonaxisymmetric structure on estimates of galaxy inclinations and position angles. Our investigation has revealed several points. First, systematic uncertainties associated with fitting photometric data dominate the formal statistical uncertainties. Second, the differences between projection angles determined with photometric data versus kinematic data are, on average, the same magnitude as the systematic uncertainties. Third, small differences between photometric and rotation centers do not significantly alter derived inclinations or position angles. Finally, we find no direct evidence for intrinsically elliptical galaxy disks.

This work was supported by NASA SARA grant NAG 5-10110.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.