Rotation and mass of NGC 2776.
Abstract
An optical study of the Sc galaxy NGC 2776 is described. Blue and red photographs show a nucleus surrounded by two principal far-stretching spiral arms. Image tube spectra (in the range 6450-6800 A) lead to a symmetrical rotation curve. A mass of 7.3 x 10 to the 10th solar masses (out to a distance of 65 arcmin) and a mass-luminosity ratio of 3.8 were determined assuming a distance of 28.4 Mpc. The photometric study showed an increase of H-alpha/N II forbidden line ratio across the arms and indicated a moderate value of excitation for the galaxy as a whole, making it an early type Sc.
- Publication:
-
Astronomy and Astrophysics Supplement Series
- Pub Date:
- September 1979
- Bibcode:
- 1979A&AS...37..529C
- Keywords:
-
- Galactic Rotation;
- Spectrophotometry;
- Astronomical Photography;
- Astronomical Spectroscopy;
- Luminosity;
- Mass Ratios;
- Tables (Data);
- Astrophysics;
- Masses:Spiral Galaxies;
- Rotation:Spiral Galaxies