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The Discovery of Quasars (the first AGN found)

Maartin Schmidt – the ‘discoverer of quasars’. Cyril Hazard – the REAL DEAL. The Discovery of Quasars (the first AGN found). The Cambridge Catalog of Radio Sources. A few hundred of the brightest radio sources were compiled with a radio interferometer at Cambridge, England.

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The Discovery of Quasars (the first AGN found)

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  1. Maartin Schmidt – the ‘discoverer of quasars’ Cyril Hazard – the REAL DEAL The Discovery of Quasars (the first AGN found)

  2. The Cambridge Catalog of Radio Sources A few hundred of the brightest radio sources were compiled with a radio interferometer at Cambridge, England. Unfortunately, the positions were not accurately known. These were the brightest radio sources in the sky – with the exception of the Sun and planets… The brightest was called 3C273.

  3. 3C273 could be anywhere in this circle! We needed a better position

  4. Lunar Occultation to the rescue! Must get both entry and exit from the moons limb!!

  5. The Parkes Radio Telescope

  6. 3C273

  7. Radio (VLA) X-ray

  8. Redshift of 0.13 indicating that the object is very far away (about 2.5 billion light years) and very bright! Schmidt measured the spectrum:

  9. Radio image of Cygnus A showing a small but very bright radio galaxy in the middle of the 320,000 ly wide lobes

  10. A galaxy lies at the center of double radio sources

  11. Giant Gas Clouds (surrounding the galaxy) Intergalactic gas jet Galaxy (which is actually quite large)

  12. This object that looks like a star must be enormously luminous - its redshift indicates it is 4 billion light years away!!

  13. Quasars and Seyfert I’s Seyfert II’s OIII [5007] (forbidden) OIII [4959] (forbidden) Hb (permitted)

  14. Broad Line Region (Light months) Dusty Molecular torus 10 – 1000 ly Accretion Disk (light days) Black Hole 100 million solar masses Jet Narrow line region clouds 10 – 10000 ly

  15. Broad Line Region (Light months) Dusty Molecular torus 10 – 1000 ly Accretion Disk (light days) Black Hole 100 million solar masses Narrow line region clouds 10 – 10000 ly

  16. Gas and dust inhibit the jet of particles! Spiral versus Elliptical galaxies

  17. Blazar CD Quasar LD Quasar BLRG NLRG Elliptical Galaxy

  18. BAL QSO QSO (SEYFERT I) FIR GALAXY (SEYFERT II) Spiral Galaxy

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