Noncircular gas motions in the spiral galaxies NGC 3031, NGC 2903, and NGC 925

Details Noncircular gas motions in the spiral galaxies NGC 3031, NGC 2903, and NGC 925 Noncircular gas motions in the spiral galaxies NGC 3031, NGC 2903, and NGC 925

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989azh....66..921s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 66, Sept.-Oct. 1989, p. 921-931. In Russian.

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10

Cosmic Gases, Gas Dynamics, Spiral Galaxies, Angular Velocity, Computational Astrophysics, Velocity Distribution

Scientific paper

A bisymmetric spiral field of peculiar velocities described by a two-arm logarithmic spiral with pitch angle of 10.7 deg, + or - 4.0 is discovered in the barred spiral NGC 925, taking account of all possible motions in the galactic plane in the linear approximation. In the normal spirals NGC 2903 (Sc) and NGC 3031 (Sab), an asymmetric perturbation of the velocity field is also detected which, together with the bisymmetric perturbation, gives a picture of the two-arm spiral field of peculiar velocities that coincides closely with the optical pattern. The amplitudes of the peculiar velocities in one of the arms are larger by a factor of 1.5 to 2.0 than in the other. There are radial gas motions toward the centers of NGC 3031 and NGC 925 and toward the periphery of NGC 2903. The density wave parameters in these galaxies are derived from the systematic velocities of the spiral field of peculiar motions. In NGC 925 the velocity of the spiral pattern, derived from the velocity field outside the bar, coincides with the angular velocity of the bar. The rotation curve, taking account of noncircular motions, and the geometric parameters of the galaxies (inclination angle, position angle of the major axis) are derived.

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