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Use the Monotony of Spiral Branches for Determination Galaxy Orientation Angles

Keywords:

S.G. Poltorak, A.M. Fridman


A method is proposed for the determination of the position and inclination angles of the plane of a spiral galaxy based on the assumption that every spiral arm is a monotonic function of the radius against azimuthal angle. This method may yield more accurate results than the more commonly employed isophote method, which is subject to a number of drawbacks. Analytical study, calibration against other methods on a sample of 72 galaxies and examples of application of the proposed method to real galaxies are presented
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