Velocity Dispersions in the Nuclei of Giant Ellipticals (fos 17): Cycle 4 Observations

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Hst Proposal Id #5125 Galaxies &Amp, Clusters

Scientific paper

The FOS will be used with small apertures to map the stellar velocity dispersion and rotation in the central 1" of NGC4486, NGC4472 and NGC6251. The velocity dispersion maps will be used to discriminate between the large M/Ls required by massive black holes, velocity anisotropy, and isothermal velocity distributions. Line strengths will be used to measure changes in the stellar population in the central 1".

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