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Probing the Halo of Centaurus a: A Merger Dynamical Model for the PN Population

  • A. Mathieu
  • H. Dejonghe
  • X. Hui
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 171)

Abstract

We use planetary nebulae observations (Hui et al. 1995) to build dynamical models of the dust-lane elliptical galaxy NGC 5128 (Centaurus A). The PN photometric and kinematical data extend out to 20 kpc (~ 4r e) along the major axis and 10 kpc along the minor axis. Our models are built using a Quadratic Programming technique (Dejonghe 1989). The method produces fits to the data set, which consists of the photometry field (E2, well fitted by a r ¼Maw) together with the major- and minor- axis rotation curves and velocity dispersion profiles. Assuming the merger hypothesis for Cen A, we describe its kinematics in a spherical potential by two sub-systems, one rotating about the intrinsic short axis and the other about the intrinsic long axis of the galaxy.

References

  1. Dejonghe, H. 1989, ApJ, 343, 113ADSCrossRefGoogle Scholar
  2. Hui, X., Ford, H.C., Freeman, K.C. & Dopita, M.A. 1995, ApJ in pressGoogle Scholar

Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • A. Mathieu
    • 1
  • H. Dejonghe
    • 1
  • X. Hui
    • 2
  1. 1.Sterrenkundig ObservatoriumGentBelgium
  2. 2.Astronomy DepartmentBoston UniversityBostonUSA

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