Extragalactic Planetary Nebula Kinematics with the WHT

Details Extragalactic Planetary Nebula Kinematics with the WHT Extragalactic Planetary Nebula Kinematics with the WHT

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ingn....4...23r&link_type=abstract

The Newsletter of the Isaac Newton Group of Telescopes (ING Newsl.), issue no. 4, p. 23-25

Other

Extragalactic Planetary Nebulae, Counter-Dispersed Imaging, Planetary Nebula Spectrograph, Wht, Wyffos, Autofib-2.

Scientific paper

In spiral galaxies, the observability to large radii of cold gas disks has facilitated a general understanding of the distribution of mass in their outer parts. Elliptical galaxies, being gas poor, are not amenable to this approach, and other tracers are necessary. The standard approach is to observe the kinematics of the stars using integrated light spectroscopy. However, an elliptical's surface brightness drops off rapidly at large radii, making such observations quite difficult in the outer parts where any dark matter would become dominant. One approach especially suitable for elliptical galaxies is to measure the kinematics of bright objects within their outer parts: globular clusters (GCs) and planetary nebulae (PNe). With a suitably large number of measured velocities, and with careful dynamical models, these objects can be used to effectively constrain the mass distribution of ellipticals. A new technique called counter-dispersed imaging allows us to detect and measure velocity of the Pne, combined into one observational step. We are members of a team which is building a specialised instrument to use this technique: the Planetary Nebula Spectrograph, soon to be commissioned at the WHT.

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