Uncertainties in Spiral Galaxy Projection Parameters

Details Uncertainties in Spiral Galaxy Projection Parameters Uncertainties in Spiral Galaxy Projection Parameters

2002-11-11

arxiv.org/abs/astro-ph/0211225v2

Astron.J. 125 (2003) 1164

Astronomy and Astrophysics

Astrophysics

submitted to AJ, Rutgers Preprint #365; V. frames of figs 5a-5e corrected

Scientific paper

10.1086/346142

We investigate the impact of nonaxisymmetric structure on estimates of galaxy inclinations and position angles. A new minimization technique is used to obtain estimates of inclination and position angle from a global fit to either photometric or kinematic data. We discuss possible systematic uncertainties which are much larger than statistical uncertainties. Our investigation reveals that systematic uncertainties associated with fitting photometric data dominate the formal statistical uncertainties. For our sample of inclined galaxies, we estimate that nonaxisymmetric features introduce inclination and position angle uncertainties of approximately 5 degrees, on average. The magnitudes of these uncertainties weaken the arguments for intrinsically elliptical galaxy disks.

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