Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...305..600n&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 305, June 15, 1986, p. 600-608.
Astronomy and Astrophysics
Astronomy
26
Elliptical Galaxies, Galactic Structure, Halos, Local Group (Astronomy), Mass To Light Ratios, Stellar Orbits, Eddington Approximation, Line Of Sight, Planetary Nebulae, Radial Velocity
Scientific paper
Radial velocities are determined for 15 planetary nebulae in the halo of M32 and used to put constraints on the form of the stellar orbits and on the mass. A technique is developed to test the compatibility of these velocities with trial velocity-dispersion profiles, applying the models of Jaffe (1983) and Merritt (1985) with varying amounts of anisotropy. Assuming constant M/L with radius, the data favor an isotropic dispersion tensor in the halo. The resulting mass is 7.0 x 10 to the 8th solar mass for a Jaffe model galaxy and 9.4 x 10 to the 8th solar mass for a de Vaucouleurs model. These correspond to M/L(B) values of 2.8 and 3.7, respectively. The data indicate that a significantly increasing M/L with radius is likely only if the stars are on highly radial orbits.
Ford Holland
Nolthenius Richard
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