Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...201l..33j&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 201, no. 2, Aug. 1988, p. L33-L36. SNSF-supported research.
Astronomy and Astrophysics
Astronomy
41
Angular Velocity, Galactic Mass, Galactic Nuclei, Galactic Rotation, Stellar Motions, Astronomical Spectroscopy, Black Holes (Astronomy), Star Clusters, Velocity Distribution
Scientific paper
The authors present new medium-resolution stellar absorption line kinematic data for the major axis of the Sombrero galaxy (NGC 4594). These data reveal a sharp mean increase of about 59 km s-1 in the velocity dispersion within 4.2" of the centre. The velocity gradient across the nucleus within this same distance is measured at 38 km s-1arcsec-1, insufficient to produce the observed peak in velocity dispersion by rotational broadening alone. It is concluded that there is strong evidence that NGC 4594 contains a super-massive object, possibly a black hole or massive star cluster. In the simplest case of spherical symmetry and isotropic stellar velocities, the authors estimate a total mass M ≅ 109M_sun; inside a region of radius r = 3.5arcsec (= 309 pc, D = 18.2 Mpc) of the centre of the galaxy.
Dubath Pierre
Jarvis Brian J.
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