Lorentz Center - The PN.S: Future Projects and Ideas from 25 Feb 2013 through 1 Mar 2013
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    The PN.S: Future Projects and Ideas
    from 25 Feb 2013 through 1 Mar 2013




The Planetary Nebulae Spectrograph (PN.S) 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 (DM) is expected to dominate and the signature of evolutionary phenomena remains imprinted in long-lived kinematic substructures.

In this workshop, we revisited the major accomplishments of the PN.S project, and discussed the synergy with other halo kinematic tracers, such as Globular Clusters (GCs) and deep absorption-line spectroscopy (long-slit, slitlets and integral field). The major goal of the workshop was to bring together scientists from the astronomical community that seek to understand the chemodinamic properties of halos. The different observational and theoretical techniques were discussed and common research areas were identified. We have defined joint projects to exploit at best the information from different kinematic tracers.

The workshop was composed of the following sessions:

1) Planetary Nebulae as kinematic tracers. In this session, the groups working on PNe presented their surveys with the PN.S and FOCAS@SUBARU, revisited their major accomplishments, and presented new results along the Hubble sequence of galaxies.

2) Globular Clusters as kinematic tracers. In this session, the groups working on GCs presented their surveys and achievements. Results arising from different tracers were compared, and analysis techniques aimed at combining data from PNe, GCs, and stellar light (slitless) were presented.

3) Dynamical modeling. The results of made-to-measure particle dynamical models, and Jeans models were presented and compared. The the dark matter distribution and concentration, orbital anisotropy, were identified as key elements in the comparison to cosmological simulations. By doing so, we will better constrain the formation mechanisms of galaxies.

4) Mass distribution: alternative tracers. Results on mass distribution from gravitational lensing and the Kids Survey were presented. Analysis of satellite galaxies to constrain the shape of the DM halo were discussed.

5) Numerical simulations. The prediction of halo properties (stellar population gradients, mass distribution and orbital anisotropy) were presented and discussed in light of the observational constrains of studies of PNe and GCs.

6) Stellar populations Stellar populations from GCs, the connection with PNe progenitors and host galaxy were presented and discussed. The hot topic of (non)universality of the Initial Mass Function was also presented and discussed. The state-of-the art upcoming MANGA survey was presented.

7) Spiral galaxies and PNe. Future projects on how to exploit the kinematic information of PNe on spiral galaxies to resolve the disk/halo degeneracy were presented and discussed.

During this week in Leiden, we dedicated a lot of time to discussion and comparison between the different strategies, galaxy samples and analysis techniques of the different teams. From the discussion, a few joint projects and strategies emerged. These are outlined below:

1) PNS-team and FOCAS@SUBARU-team will join forces to study the kinematics of edge-on spiral galaxies (NGC 891, NGC 5907) as well as a combined study of the S0 galaxy NGC 5866 (for which they have PNe in common)

2) PNS-team and simulations team will exchange data and models to constrain formation mechanisms of ETGs, and to the identification of kinematics substructures in the halos.

3) PNS-team and GCs-team will join forces to study the ETG galaxy NGC 4697. Once the two surveys will be completed, a joint comparative study will be done.

All this has only been possible thanks to the unique environment and infrastructure provided to us by the Lorentz Center.


Magda Arnaboldi (Garching, Germany)
Ana Chies Santos (Nottingham, United Kingdom)
Lodovico Coccato (Garching, Germany)
Konrad Kuijken (Leiden, Netherlands)
Nicola Napolitano (Naples, Italy)