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Globular Clusters and Planetary Nebula Kinematics in NGC 5128 (Cen A)

  • Eric W. Peng (a1), Holland C. Ford (a1) and Kenneth C. Freeman (a2)

Abstract

We have conducted a wide-field optical survey of NGC 5128 (Cen A), the nearest large elliptical galaxy (3.5 Mpc). From UBVRI imaging and spectroscopic follow-up, we have identified and obtained kinematics for 125 new globular clusters out to a projected radius of 40 kpc. We also extend our survey of field star kinematics in NGC 5128, and now possess a total of 736 radial velocities for planetary nebulae out to a projected radius of 80 kpc.

  1. The PNe sample along the photometric major axis shows significant rotational support out to 80 kpc.
  2. The blue globular clusters seem to possess little or no angular momentum.
  3. The kinematics of the red globular cluster sample show some evidence for rotation around an axis common to that of the field stars.

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References

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Harris, G., Geisler, D., Harris, H., & Hesser, J. 1992, AJ, 287, 175
Hui, X., Ford, H. C., Freeman, K. C. & Dopita, M. A. 1995, ApJ, 449, 592

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