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The case for unification.

Gopal-Krishna1

  • 1European Southern Observatory, Santiago, Chile.

Proceedings of the National Academy of Sciences of the United States of America
|December 5, 1995
PubMed
Summary
This summary is machine-generated.

Radio-loud galaxy subclasses may be unified under a single model, differing only in viewing angle. This unified scheme (US) incorporates relativistic jets and nuclear tori, with torus opening angles potentially linked to active galactic nucleus luminosity.

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Area of Science:

  • Astronomy
  • Astrophysics
  • Cosmology

Background:

  • Radio-loud galaxies exhibit diverse subclasses (e.g., Fanaroff-Riley type I and II).
  • A popular "unified scheme" (US) proposes these subclasses are intrinsically similar, differing primarily in observed orientation.
  • Key components of the US include relativistic jets and nuclear tori.

Purpose of the Study:

  • To investigate if radio-loud galaxy subclasses are intrinsically the same, differing only by viewing angle.
  • To update evidence for relativistic jets and nuclear tori within the US.
  • To examine the relationship between torus opening angle and active galactic nucleus (AGN) radio luminosity.

Main Methods:

  • Analyzing structural and polarization properties of radio-loud AGN on various scales.

Related Experiment Videos

  • Utilizing radio-size measurements from large, orientation-independent samples.
  • Incorporating very-long-baseline radio interferometry polarimetric observations.
  • Considering temporal evolution of radio source properties.

    • Main Results:

    • The torus opening angle may increase with AGN radio luminosity.
    • Recent claims of conflict with the US, based on radio-size statistics, are critically examined.
    • Reconciliation of observational data with the US is proposed through orientation and temporal evolution.

    Conclusions:

    • The scope of unified models for radio-loud AGN continues to expand.
    • A scenario incorporating temporal evolution can explain size differences between quasars and radio galaxies.
    • While issues remain, the US provides a viable framework for understanding radio-loud galaxy diversity.