Highly ionized gas in PKS 2152-69

  • Clive N. Tadhunter
Optical Observations
Part of the Lecture Notes in Physics book series (LNP, volume 327)


A gas cloud 10 arcsec to the NE of the nucleus of PKS 2152-69 exhibits many features that are more commonly associated with active nuclei. These include an extremely high ionization state with relatively strong emission lines from species like Ne +4 , He+, Fe +6 and Fe+9, blue asymmetric wings to the forbidden lines and a continuum that rises steeply to the blue. The proximity of the cloud to the radio axis and the tangential ionization gradients indicate that the cloud is energized by a narrow beam of radiation or plasma from the nucleus. Future studies of the cloud will have relevance to a number of long-standing problems in active galaxy research.


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  1. Fosbury, R.A.E., 1986. In: Structure and Evolution of Active Galactic Nuclei, Giuricin, G. et al. (eds), Reidel, p297.Google Scholar
  2. di Serego Alighieri, S., Binette, L., Courvoisier, T., Fosbury, R.A.E. & Tadhunter, C.N., 1988. Submitted to Nature.Google Scholar
  3. Tadhunter, C.N., Fosbury, R.A.E., Binette, L., Danziger, I.J. & Robinson, A., 1987. Nature, 316, 733.Google Scholar
  4. Tadhunter, C.N., Fosbury, R.A.E., di Serego Alighieri, S., Bland, J., Danziger, I.J., Goss, W.M., McAdam, W.B. & Snijders, M.A.J., 1988. Mon. Not. R. astr. Soc. in press.Google Scholar

Copyright information

© Springer-Verlag 1989

Authors and Affiliations

  • Clive N. Tadhunter
    • 1
  1. 1.Space Telescope-European Coordinating Facility, European Southern ObservatoryGarching bei MünchenFRG

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