Rotation and mass of the inner 5 kiloparsecs of the S0 galaxy NGC 3115

Details Rotation and mass of the inner 5 kiloparsecs of the S0 galaxy NGC 3115 Rotation and mass of the inner 5 kiloparsecs of the S0 galaxy NGC 3115

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239...50r&link_type=abstract

Astrophysical Journal, Part 1, vol. 239, July 1, 1980, p. 50-53.

Astronomy and Astrophysics

Astrophysics

20

Disk Galaxies, Galactic Rotation, Galactic Structure, Mass Distribution, Angular Velocity, Astronomical Models, Mass Ratios

Scientific paper

NGC 3115 is an isolated field galaxy of type S0. It has a small disk embedded in a large flattened halo. Observed velocities rise steeply to 200 km/s at r = 450 pc and then are flat at 267 km/s from r = 700 to r = 4.7 kpc. Based on a simple spheroid model, the mass is greater than 7 x 10 to the 10th solar masses interior to r = 5 kpc. By its kinematic properties, NGC 3115 resembles a rapidly rotating high-density disk galaxy rather than a slowly rotating elliptical galaxy. There is no evidence for a variation in the mass to luminosity ratio from 1 to 5 kpc.

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