PMID: 11607607Dec 5, 1995Paper

The case for unification

Proceedings of the National Academy of Sciences of the United States of America
Gopal-Krishna

Abstract

I investigate the issue of whether the various subclasses of radio-loud galaxies are intrinsically the same but have been classified differently mainly due to their being viewed from different directions. Evidence for the two key elements of this popular version of the "unified scheme (US)," relativistic jets and nuclear tori, is updated. The case for the torus opening angle increasing with the radio luminosity of the active galactic nucleus (AGN) is freshly argued. Radio-loud AGN are particularly suited for testing the US, since their structures and polarization properties on different scales, as well as their overall radio sizes, provide useful statistical indicators of the relative orientations of their various subclasses. I summarize recent attempts to bring under a single conceptual framework the USs developed for radio-moderate [Fanaroff-Riley type I (FRI)] and radio-powerful (FRII) AGN. By focusing on FRII radio sources, I critically examine the recent claims of conflict with the US, based on the statistics of radio-size measurements for large, presumably orientation-independent, samples with essentially complete optical identifications. Possible ways of reconciling these results, and also the ones based on very-long-bas...Continue Reading

References

Dec 5, 1995·Proceedings of the National Academy of Sciences of the United States of America·A C Readhead

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Citations

Dec 5, 1995·Proceedings of the National Academy of Sciences of the United States of America·M H Cohen, K I Kellermann
Dec 5, 1995·Proceedings of the National Academy of Sciences of the United States of America·R A Laing
Dec 5, 1995·Proceedings of the National Academy of Sciences of the United States of America·D J Saikia
Jul 1, 1996·Physical Review Letters·G BaoP Hadrava

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