Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.219..373g&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 219, March 15, 1986, p. 373-386.
Astronomy and Astrophysics
Astronomy
16
Andromeda Galaxy, Celestial Mechanics, Galactic Nuclei, Stellar Orbits, Stellar Systems, Astronomical Photometry, Charge Coupled Devices, Dark Matter, Density Distribution, Mass To Light Ratios
Scientific paper
Massive compact structures in the centers of triaxial stellar systems may subject stars on box orbits to large-angle deflections and thereby disrupt the triaxiality of their parent galaxies. The question of whether or not the nucleus of M31 can affect the dynamics of the bulge in this way is adddressed. Photometric models of the nucleus and bulge of M31 are derived from available Stratoscope II and ground-based CCD observations. Rotation measurements at a distance of 2 arcsecs from the center are used to determine a minimum nuclear mass. If the nucleus and bulge each have a constant mass-to-light ratio, the nucleus is sufficiently massive and dense to scatter and disrupt any box orbits in the inner 500 pc of the bulge, implying that the inner bulge could not now be triaxial. The persistence of some isophotal twists in this region after the effects of dust have been removed, together with relaxation time arguments, may therefore suggest that the inferred dark matter in the nuclear region is in low-mass objects, which are less centrally concentrated than the visible nucleus.
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