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Unification and large-scale structure.

R A Laing1

  • 1Royal Greenwich Observatory, Cambridge, United Kingdom.

Proceedings of the National Academy of Sciences of the United States of America
|December 5, 1995
PubMed
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Relativistic jets in radio sources likely decelerate on observable scales, influencing the appearance of both FRI and FRII radio galaxies. This study explores the consequences of this jet deceleration hypothesis.

Area of Science:

  • Extragalactic astronomy
  • Astrophysics
  • Radio astronomy

Background:

  • Extended radio sources exhibit symmetrical outer structures, suggesting subrelativistic speeds.
  • The hypothesis of relativistic flow on parsec scales is proposed for these sources.

Purpose of the Study:

  • To explore the consequences of jet deceleration on observable scales.
  • To investigate the impact on the appearances of FRI and FRII radio sources.

Main Methods:

  • Theoretical modeling of relativistic jet deceleration.
  • Analysis of observational data from the Very Large Array (VLA).

Main Results:

  • Jets are required to decelerate on scales observable with the Very Large Array.

Related Experiment Videos

  • The deceleration impacts the distinct morphologies of FRI and FRII radio sources.

    • Conclusions:

    • The deceleration of relativistic jets is a key factor in understanding radio source evolution.
    • This hypothesis reconciles the relativistic inner jets with subrelativistic outer structures.