ULTRA STEEP RADIO SOURCES AT HIGH REDSHIFT

M.A.R. Bremer

August 1991

Under supervision of Prof. Dr. G.K. Miley and Dr. K.C. Chambers

Leiden Observatory, The Netherlands

If we are not content with the dull accumulation of experimental facts, if we make any deductions or generalizations, if we seek for any theory to guide us, some degree of speculation cannot be avoided. Arthur Eddington

• • Prologue
  • Why study radio galaxies
  • Classification based on morphology
  • The unification model
  • The Laing-Garrington effect
• • WSRT observations of steep spectrum sources
  • The spectral index investigation
    • Apparent magnitude
    • Redshift and 178 MHz luminosity
    • Angular sizes
    • Selection effects
  • The ultra steep spectrum survey
  • The alignment of radio and optical axes
  • How old are high redshift radio galaxies
• • Introduction
  • Modelling the central engine
  • Derivation of the rotation measure
  • Relativistic beaming
  • Basic cosmological relations
    • The redshift relations
    • The decelaration parameter
    • Other parameters
• • Introduction
    • 4C60.07 - The distant one
      • Introduction
      • Observations
      • Results
    • 4C23.56 - The giant
      • Introduction
      • Observations
      • Results
• • 4C28.58 - An average high redshift galaxy
    • Introduction
    • Observations
    • Results
• • 4C24.28 - A weird radio galaxy
    • Introduction
    • Observations
    • Results
• • 4C48.48 - A flux-asymmetric galaxy
    • Introduction
    • Observations
    • Results
• • 4C40.36 - A compact radio galaxy
    • Introduction
    • Observations
    • Results
• • Probing the depolarization medium
  • Epilogue
  • References
  • Acknowledgements
  • The VLA
  • The reduction techniques
    • CLEAN
    • Self-calibration
• About this document ...