Planetary camera observations of the central parsec of M32

Details Planetary camera observations of the central parsec of M32 Planetary camera observations of the central parsec of M32

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104..552l&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 104, no. 2, Aug. 1992, p. 552-562.

Astronomy and Astrophysics

Astronomy

88

Black Holes (Astronomy), Elliptical Galaxies, Galactic Nuclei, Hubble Space Telescope, Astronomical Models, Brightness Distribution, Dark Matter, Galactic Mass, Galactic Structure, Mass To Light Ratios

Scientific paper

New HST observations are reported which show that the M32 nucleus is extremely dense, with rho0 not less than 4 x 10 exp 6 solar masses/cu pc if M32 has a core with rc not greater than 0.37 pc, and rho0 greater than 3 x 10 exp 7 solar masses/cu pc if it instead has a central r exp -1/2 cusp. Limits on the M32 core radius are nearly three times smaller, and those on the central density at least four times greater, than values inferred from the best ground-based observations. A central relaxation that is almost an order of magnitude shorter than previous estimates is inferred from the new core parameters; a shorter stellar collision time is also inferred. It is argued that a starlight cusp surrounds the central black hole.

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