Rotation and mass of the late-type galaxy NGC 2997

Details Rotation and mass of the late-type galaxy NGC 2997 Rotation and mass of the late-type galaxy NGC 2997

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226...75p&link_type=abstract

Astrophysical Journal, Part 1, vol. 226, Nov. 15, 1978, p. 75-80.

Astronomy and Astrophysics

Astrophysics

32

Astronomical Spectroscopy, Galactic Rotation, Mass Distribution, Angular Velocity, Image Tubes, Luminous Intensity, Radial Velocity

Scientific paper

Spectroscopy in seven position angles has been used to define the rotation curve of the Sc galaxy NGC 2997. The velocity curve rises rapidly to V = 185 km/s (corrected for inclination) and stays flat to a radius of about 10 kpc, indicating a mass within this radius of approximately 60 billion solar masses. On the basis of an extension of the optical rotation curve made possible by the published 21-cm data of Whiteoak and Gardner (1977), the total mass is at least twice this value, and the total mass-luminosity ratio is approximately 6. The systemic velocity of the galaxy is determined to be V = 1079 + or - 5 km/s from the optical data.

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