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

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

3. M51 – the Whirlpool and companion COLLIDING GALAXIES

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

5. Sgr dwarf elliptical merging with Milky Way COLLIDING GALAXIES

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. In 1962, British radio astronomer Cyril Hazard used moon as an occultive shield RADIO XRAY OPTICAL IDENTIFYING THE OPTICAL COUNTERPART

8. 3C 273 spectrum 7x10 44 ergs/s ! Martin Schmidt

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

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

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

14. Current work: PhD student Shea Brown Coma cluster of galaxies and radio “relic” from infall of galaxies into cluster Blue – radio WSRT Red – X-rays ROSAT Green – diffuse radio, GBT

15. The central engine for active galaxies, radio galaxies, quasars -- supermassive black holes 10 9 x mass Sun http://www.mpe.mpg.de/ir/GC/index.php Our galactic center 10 6 x mass Sun

16. VLBI

17. “Superluminal” motion Relativistic almost along line of sight

18. Radio galaxy Seyfert galaxies/ Quasars Blazars UNIFIED MODELS