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The PN.S: Future Projects and Ideas
The Planetary Nebulae Spectrograph (PN.S, Douglas et al. 2002) has been a major technological breakthrough in the exploitation of planetary nebulae (PNe) as mass probes in galaxies. It allows their detection through the Oxygen [OIII] emission at 5007 Angstrom at large galactocentric radii, where dark matter is expected to dominate and the signature of evolutionary phenomena remains imprinted in long-lived kinematic substructures.
In this workshop, we will revisit the major accomplishments of the PN.S project, and discuss the synergy with other halo kinematic tracers, such as Globular Clusters or deep absorption-line spectroscopy (long-slit, slitlets and integral field). Modelling techniques for discrete 2D velocity fields will also be discussed, understanding strength and weaknesses of different approaches. Kinematic data and dynamical analysis will be linked to the stellar population properties and to the predictions of cosmological simulations, to probe the formation mechanisms of stellar halos.
Large time will be dedicated to the discussion among different teams from the astonomical community, to identify common research areas and techniques to study at best the properties of stellar halos, and to define joint projects to exploit at best the information from different kinematic tracers.