Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348..120d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. 120-126.
Astronomy and Astrophysics
Astronomy
59
Galactic Nuclei, Kinematics, Star Clusters, Stellar Motions, Stellar Orbits, Virgo Galactic Cluster, Black Holes (Astronomy), Elliptical Galaxies, Signal To Noise Ratios, Stellar Mass
Scientific paper
New, high S/N spectra of the core of M87 are presented which confirm Dressler's (1980) claim that the velocity dispersion does not continue to rise within r = 1 arcsec, but levels off at sigma about 360 km/s (1980). The line strength of the Mg b feature falls sharply in the nucleus due to the contribution of a nonthermal spectrum. The central light spike in M87 is completely explained by this nonthermal component, in contradiction to Dressler's claim that much of the spike is due to a central star cluster. Maximum entropy models have been constructed to match the new data. They exclude the possibility of a supermassive black hole unless a highly contrived model is accepted. A model with no supermassive black hole which has a mild anisotropy in the stellar orbits is a good fit to the data, but a model having only slightly greater anisotropy can accommodate a central mass concentration of up to one billion solar masses.
Dressler Alan
Richstone Douglas O.
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