Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..128k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 128-141.
Astronomy and Astrophysics
Astronomy
205
Andromeda Galaxy, Black Holes (Astronomy), Galactic Nuclei, Galactic Structure, Dark Matter, Fourier Analysis, Galactic Mass, Mass To Light Ratios, Stellar Rotation
Scientific paper
Stellar rotation velocities and velocity dispersions along three slit positions in M31 have been measured in seeing of 0arcsec.5 with the CFH telescope. The velocities and velocity gradients in the semi-stellar nucleus are large. The maximum apparent rotation velocity V is 148±5 km s-1 at r = 1arcsec.1. The apparent velocity dispersion σ is 245±7 km s-1 at the center but ⪉100 km s-1 at r ⪆ 2arcsec. To search for a central black hole, three-dimensional velocity and velocity dispersion fields are found that fit the observations after projection and seeing convolution. The large velocities and velocity gradients imply that the total-mass-to-light ratio M/LV rises sharply at r ⪉ 0arcsec.5 to values greater than 102. Therefore there is strong evidence for a dark central mass, probably a supermassive black hole. This has a mass of 106.5 - 107M_sun; if the nucleus is a disk or 107 - 108M_sun; if the nucleus is an ellipsoid with the observed apparent thickness.
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