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The Stellar and Dark Matter Halo of NGC 5128

Published online by Cambridge University Press:  26 May 2016

Eric Peng
Affiliation:
Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA
Holland Ford
Affiliation:
Johns Hopkins University, 3400 N. Charles St., Baltimore, MD 21218, USA
Kenneth Freeman
Affiliation:
RSAA, Australian National University, Canberra, ACT

Abstract

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Extragalactic planetary nebulae (PNe) and globular clusters (GCs) are complementary tools for obtaining kinematic information on stellar populations in the outer halos elliptical galaxies. NGC 5128, as the nearest large elliptical (D ~ 3.5 Mpc), is an excellent galaxy for halo studies. We have now identified a total of 1140 PNe, and possess radial velocities for 736 PNe at distances out to 80 and 50 kpc along the photometric axes. There is clear evidence for kinematic axis twisting (triaxiality) in the PNe velocity field. The mass of NGC 5128 continues to rise out to 80 kpc, where M(< 80 kpc) ~ 6.4 x 1011M with M80/LB ~ 20. We also conducted a new survey for GCs out to 50 and 30 kpc, and now have radial velocities for 188 GCs (125 new). Both the red and blue GC systems exhibit rotation. The red (metal-rich) GCs share a misaligned kinematic axis with the PNe. The success of this survey bodes well for future galaxy halo studies.

Type
Part VIII: Planetary Nebulae as Galaxy Probes
Copyright
Copyright © Astronomical Society of the Pacific 2003