Dynamics of the flattened elliptical galaxy NGC 4473

Details Dynamics of the flattened elliptical galaxy NGC 4473 Dynamics of the flattened elliptical galaxy NGC 4473

Jun 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222..450y&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, June 1, 1978, p. 450-455. Research supported by the Science Research Council of Englan

Astronomy and Astrophysics

Astrophysics

61

Astronomical Spectroscopy, Elliptical Galaxies, Galactic Rotation, Galactic Radiation, Line Spectra, Photon Density, Red Shift, Stellar Spectra

Scientific paper

Spectroscopic observations of the E5 galaxy NGC 4473 to a distance of 45 sec (3300 pc) from the center along the major axis are used to make the first estimates of the radial variation of rotation and velocity dispersion in a galaxy away from the regions of the core. Analysis with Fourier techniques shows the rotation curve to have an observed semiamplitude of 60 km/s (or 86 km/s when corrected for projection). The velocity dispersion 180 km/s is constant along the major axis of the galaxy to a distance of 45 sec, and the line strengths fall by 35%. The kinetic energy ratio Trot/T sub ran = 0.08 demonstrates that the galaxy is pressure supported. The mass interior to 3.3 kpc radius is determined to be 46 billion solar masses. The mass to light ratio of the system is M/L = 6, and increases slowly with radius.

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