A search for dark matter in elliptical galaxies: Radially extended spectroscopic observations for six objects

Details A search for dark matter in elliptical galaxies: Radially extended spectroscopic observations for six objects A search for dark matter in elliptical galaxies: Radially extended spectroscopic observations for six objects

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...292..381b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 292, no. 2, p. 381-391

Astronomy and Astrophysics

Astrophysics

84

Astronomical Models, Dark Matter, Elliptical Galaxies, Galactic Halos, Kinematics, Line Spectra, Mass Distribution, Velocity Distribution, Astronomical Photometry, Charge Coupled Devices, Dynamic Models, Iron, Magnesium, Mass To Light Ratios, Reflecting Telescopes, Spectrographs

Scientific paper

Within the European Southern Observatory (ESO) Key Programme 'A search for dark matter in elliptical galaxies', we have performed a detailed study of the large scale stellar kinematics of NGC 1400, 4946, 5812, 6721, 7507, and 7796. Our observations have produced kinematical data down to the 24.1 mag/sq arcsec in the B band, i.e. in some cases out to 2 Re and beyond. NGC 1400, 4946, and 6721 show significant rotation. The other three galaxies (NGC 5812, 7507, and 7796) can be described by spherical non-rotating equilibrium models. For two of these objects self-consistent stellar dynamical models with constant mass-to-light ratio are found to give good fits to the photometric and kinematical data, although the presence of dark matter is not excluded. In contrast, NGC 7796 shows evidence for the presence of a dark halo. This galaxy also exhibits counterrotation inside 4 sec and, correspondingly, a central peak in the velocity dispersion profile. On the basis of the small sample of objects studied so far, with radially extended spectroscopic observations, possible trends in the size of dark halos around elliptical galaxies are pointed out.

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