Analysis of high-resolution velocity fields - NGC 6503

Details Analysis of high-resolution velocity fields - NGC 6503 Analysis of high-resolution velocity fields - NGC 6503

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985aj.....90.1038v&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 90, June 1985, p. 1038-1045.

Statistics

Computation

33

Galactic Rotation, Least Squares Method, Orbital Elements, Radial Velocity, Spiral Galaxies, Velocity Distribution, Angular Velocity, Computational Astrophysics, Disk Galaxies, Inclination, Kinematics

Scientific paper

Galaxy velocity fields are presently analyzed, and orbital parameters determined, by means of a nonlinear least-squares fitting routine which requires less unnecessary user interaction than previous methods and leads to more accurate and unambiguous results. Emphasis is given to the correct determination of orbital inclination. The method is applied to the velocity field of NGC 6503, for which residual velocity field interpretation indicates the existence of regions with substantial noncircular velocities. Application of the least squares method to the optical velocity field of this galaxy shows it to be consistent with the H I field.

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