Mathematics – Logic
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..419..175f&link_type=abstract
Galaxy Evolution: Emerging Insights and Future Challenges ASP Conference Series, Vol. 419, proceedings of a conference held 11-1
Mathematics
Logic
Scientific paper
Our current picture of the universe says that galaxies are surrounded by massive dark matter halos in which they formed. Cosmological simulations have become detailed enough to model individual galaxy formation yet observational signatures of dark matter in elliptical galaxies are still difficult to measure. Tracers such as planetary nebulae have been used to probe the outer parts of galaxies where dark matter is thought to dominate. We present line-of-sight velocity distributions of elliptical galaxy NGC 6702 obtained with long-slit spectroscopy from the Hobby-Eberly Telescope. We then use axisymmetric orbit-superposition models to match possible dark matter distributions to our kinematic data. Previously we used this technique to show that elliptical galaxy NGC 821 contains dark matter and that it is not in the expected NFW profile shape. Our results for NGC 6702 show that dark matter is needed to explain the data yet we can not constrain the shape of the dark matter halo.
Forestell Amy
Gebhardt Karl
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