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Peculiar (colliding) Galaxies and Active Galaxies

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

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Peculiar (colliding) Galaxies and Active Galaxies

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

  3. COLLIDING GALAXIES M51 – the Whirlpool and companion

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

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

  8. 3C 273 spectrum Martin Schmidt 7x1044 ergs/s !

  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. 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

  13. 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

  14. VLBI

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

  16. UNIFIED MODELS Radio galaxy Seyfert galaxies/ Quasars Blazars

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