NGC 5128: The Giant Beneath

Details NGC 5128: The Giant Beneath NGC 5128: The Giant Beneath

2010-04-27

arxiv.org/abs/1004.4907v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

PASA in press

Scientific paper

I review what we have learned about the old stellar population of NGC 5128, the only large E galaxy close enough that we can currently observe individual stars as faint as the horizontal branch. Although its galaxy type is still a matter of debate for some, the uncertainties over distance are now largely resolved; comparison of five stellar distance indicators gives d=3.8 +- 0.1 Mpc. The globular cluster system, which was once perplexingly invisible, is now known to be predominantly old with a substantial metal-rich component. The GCS total population and luminosity function are normal and the clusters follow the same fundamental plane relation as those in the Milky Way and M31. Finally, the halo out to at least ~7r_{eff} is dominated by metal-rich stars which are also predominantly old, with age and metallicity tantalizingly similar to the majority of globular clusters.

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