Peculiar colliding Galaxies and Active Galaxies Colliding galaxies

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

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

COLLIDING GALAXIES M 51 – the Whirlpool and companion

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

COLLIDING GALAXIES Sgr dwarf elliptical merging with Milky Way

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

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

3 C 273 spectrum Martin Schmidt 7 x 1044 ergs/s !

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

Giant elliptical M 87 Cen A – radio emission M 87 – jet from nucleus

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

Current work: Ph. D 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

The central engine for active galaxies, radio galaxies, quasars -supermassive black holes 109 x mass Sun Our galactic center 106 x mass Sun http: //www. mpe. mpg. de/ir/GC/index. php

VLBI

“Superluminal” motion Relativistic almost along line of sight

UNIFIED MODELS Radio galaxy Seyfert galaxies/ Quasars Blazars