Velocities and mass distribution in the barred spiral NGC 5728

Details Velocities and mass distribution in the barred spiral NGC 5728 Velocities and mass distribution in the barred spiral NGC 5728

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...238..808r&link_type=abstract

Astrophysical Journal, Part 1, vol. 238, June 15, 1980, p. 808-817.

Astronomy and Astrophysics

Astrophysics

29

Galactic Rotation, Galactic Structure, Mass Distribution, Spiral Galaxies, Velocity Distribution, Angular Velocity, Galactic Nuclei, Potential Fields

Scientific paper

NGC 5728 is classified as a barred spiral galaxy, although its morphology is of the lens or oval disk type. Velocities near the nucleus indicate rotational motions, but with large (V ∼ 250 km s-1) outward streaming motions. Beyond the center, the disk rotates with apparent constant angular velocity to the edge of the disk, r = 16 kpc, where the oval disk merges with two very faint open arms. The mass in the disk plus bulge is 1011 Msun, with 80% coming from the constant density disk. The velocity structure is generally in agreement with velocities predicted by theoretical models of barred spiral galaxies which incorporate a small nonaxisymmetric perturbing potential.

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