The stellar dynamics of NGC 1399

Details The stellar dynamics of NGC 1399 The stellar dynamics of NGC 1399

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...336..639b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 15, 1989, p. 639-654.

Physics

41

Astrodynamics, Astronomical Photometry, Galaxies, Stellar Physics, Anisotropy, Brightness Distribution, Charge Coupled Devices, Mass To Light Ratios, Star Distribution, Velocity Distribution

Scientific paper

The dynamical properties of NGC 1399 as revealed through new CCD surface photometry and measurements of the velocity dispersion profile out to almost 6 kpc are considered. The data reveal no unusual features in the surface brightness profile of this galaxy, but the velocity dispersion profile is quite striking. It is approximately constant through the region 10-86 arcsec from the core but within 10 arcsec increases significantly from about 200 km/s to a central value of 365 km/s. Alternative interpretations of the velocity dispersion data involving either anisotropic stellar orbits or a black hole are considered. It is concluded that a black hole in NGC 1399 is unlikely and that mild anisotropy in the stellar distribution is adequate to explain the data.

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