Extragalactic planetary nebulae as mass tracers: biases in the estimate of dynamical quantities

Details Extragalactic planetary nebulae as mass tracers: biases in the estimate of dynamical quantities Extragalactic planetary nebulae as mass tracers: biases in the estimate of dynamical quantities

1999-10-06

arxiv.org/abs/astro-ph/9910108v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear on ``Galaxy Dynamics: from Early Universe to the Present'', ASP Conf. Ser., F. Combes, G.A. Mamo

Scientific paper

Planetary Nebulae (PNe) are very important kinematical tracers of the outer regions of early-type galaxies, where the integrated light techniques fail. Under ad hoc assumptions, they allow measurements of rotation velocity and velocity dispersion profile from descrete radial velocity fields. We present the results on the precision allowed by different set of radial velocity samples, discuss the hypotheses in the analysis of descrete velocity fields and their impact on the inferred kinematics of the stellar population.

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