1. Peculiar (colliding) Galaxies and Active Galaxies
Colliding galaxies  tidal distortions, star formation, evolution
Active galaxies  bright nuclei (Seyfert)‏
Quasar discovery - the, high redshift surprise
“Non-thermal” radiation (synchrotron +)‏
Models: supermassive black hole + accretion
Beyond the nucleus – radio galaxies & jets

2. Galaxies in collision/interacting/mergers
Computer simulation – interacting pair
The “Antennae”

3. M51 – the Whirlpool and companion

4. Ring of active star formation
Evidence for mergers
Distant Galaxies (large lookback times) – forming via mergers
Ring of active star formation

5. Sgr dwarf elliptical merging with Milky Way

6. Seyfert galaxies – spirals with very luminous central nucleus
strong infrared and radio sources
Strong emission H, He, N, O
Doppler broadened lines
Carl Seyfert

7. 3C 273 spectrum
Martin Schmidt
7x1044 ergs/s !

8. Seyfert galaxies are characterized by extremely bright nuclei, and spectra which have very bright emission lines of hydrogen, helium, nitrogen, and oxygen. These emission lines exhibit strong Doppler broadening, which implies velocities from 500 to 4000 km/s, and are believed to originate near an accretion disk surrounding the central black hole.[3]
These emission lines may come from the surface of the accretion disk itself, or may come from clouds of gas illuminated by the central engine in an ionization cone. The exact geometry of the emitting region is difficult to determine due to poor resolution. However, each part of the accretion disk has a different velocity relative to our line of sight, and the faster the gas is rotating around the black hole, the broader the line will be. Similarly, an illuminated disc wind also has a position-dependent velocity.

9. Quasars – Quasi-stellar Object (QSOs)‏
Central source so luminous appears star-like
Radio/Optical/UV/Xray/Gamma-ray radiation

10. Giant elliptical
M87
Cen A – radio emission
M87 – jet from nucleus

11. Active Galaxies Strong radio sources
Radio galaxies -- jets of non- thermal radiation – two-lobed appearance due ejection at high energies

12. The central engine for active galaxies, radio galaxies, quasars --
supermassive black holes
109 x mass Sun
Our galactic center
106 x mass Sun

13. VLBI