Peculiar (colliding) Galaxies and Active Galaxies Colliding galaxies  tidal distortions, star formation, evolution (role of simulations) Active galaxies.

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Presentation transcript:

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

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

M51 – the Whirlpool and companion COLLIDING GALAXIES

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

Sgr dwarf elliptical merging with Milky Way COLLIDING GALAXIES

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 Cyril Hazard used moon as an occultive shield RADIO XRAY OPTICAL IDENTIFYING THE OPTICAL COUNTERPART

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

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

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

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

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

The central engine for active galaxies, radio galaxies, quasars -- supermassive black holes 10 9 x mass Sun Our galactic center 10 6 x mass Sun

VLBI

“Superluminal” motion Relativistic almost along line of sight

Radio galaxy Seyfert galaxies/ Quasars Blazars UNIFIED MODELS

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