Download O III [4959] (forbidden)

The Discovery of Quasars (the first AGN found)
Cyril Hazard – the REAL DEAL
Maartin Schmidt – the ‘discoverer of quasars’
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.
3C273 could be
anywhere in this
circle!
We needed a
better position
Lunar Occultation to the
rescue!
Must get both entry and exit
from the moons limb!!
The Parkes Radio Telescope
3C273
Radio (VLA)
X-ray
Schmidt measured the spectrum:
Redshift of 0.13 indicating that the object is very far away (about 2.5 billion
light years) and very bright!
Radio image of Cygnus A showing a small but very
bright radio galaxy in the middle of the 320,000 ly
wide lobes
A galaxy lies at the center of
double radio sources
Giant Gas
Clouds
(surrounding the
galaxy)
Intergalactic
gas jet
Galaxy
(which is actually
quite large)
This object
that looks
like a star
must be
enormously
luminous its redshift
indicates it
is 4 billion
light years
away!!
Quasars and Seyfert I’s
Seyfert II’s
OIII [5007] (forbidden)
OIII [4959] (forbidden)
Hb (permitted)
Jet
Narrow line region clouds
10 – 10000 ly
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
Broad Line Region
(Light months)
Dusty Molecular torus
10 – 1000 ly
Accretion Disk (light days)
Black Hole
100 million
solar masses
Gas and dust inhibit the jet of particles!
Spiral versus Elliptical
galaxies
Blazar
CD Quasar
LD Quasar
BLRG
NLRG
Elliptical Galaxy
BAL QSO
QSO (SEYFERT I)
FIR GALAXY (SEYFERT II)
Spiral Galaxy