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The radio galaxy IC 4296 (PKS 1333-33). II. Spectroscopy, surface photometry, X-ray imaging, and infrared photometry
The authors present stellar rotation and velocity dispersion data,optical surface photometry, Einstein Observatory IPC X-ray data, andaperture (optical and infrared) photometry of the radio galaxy IC 4296.It is found that the projected stellar rotation axis is misaligned withthe projected radio axis by ?28°. The photometric major andminor axis surface brightness profiles of IC 4296 are well representedby King (1966) models in the range 3arcsec < r < 100arcsec. Thecentral mass-to-light ratio is M/LB = (13±3)h (hHubble constant in units of 100 km s-1Mpc-1). TheIPC X-ray image shows a slightly resolved source centered on IC 4296.Isothermal, hydrostatic atmospheres that are consistent with the X-raydata can be constructed.
| Kinematics and dynamics of the haloes of supergiant galaxies
Measurements of the internal kinematics of the haloes of threesupergiant (cD or giant dumbbell) galaxies in moderately rich clustersare presented. It is found that these galaxies have velocity dispersionprofiles which are flat or which rise with increasing radius. Theobservations are explained by two simple models. The first class hasisotropic velocity dispersions and a two-component mass distribution: abright component with a density distribution which follows a King model,and a dark isothermal component with a density distribution which isslightly more concentrated than that of the galaxies in the cluster as awhole. The second class has predominantly tangential motions in the haloof the galaxy and no dark component. In common with most luminouselliptical galaxies these supergiant galaxies are not flattered byrotation. In the two dumbbells studied the relative velocities betweenthe nuclei are comparable to the stellar velocity dispersions in the cDenvelopes.
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