Starbursts, Interacting Galaxies and Active Galactic Nuclei (AGNs) Evidence for close encounters, collisions & mergers Eruptions and explosions -- radio.

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February 9, 11:00 am. The unusually bright centers found in some galaxies are called 1.active galactic nuclei. 2.starbursts. 3.halos. 4.supermassive.
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Starbursts, Interacting Galaxies and Active Galactic Nuclei (AGNs) Evidence for close encounters, collisions & mergers Eruptions and explosions -- radio galaxies active galaxies, AGNs quasars

M82

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

M51 – the Whirlpool and companion

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

Sgr dwarf elliptical merging with Milky Way

The Local Group -- Andromeda (M31) and Milky Way

Artists concept of MW – Andromeda merger Numerous examples of computer simulations of the projected merger can be found on the Internet

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

Cygnus A

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

Seyfert galaxies Carl Seyfert 1943

Seyfert galaxies – very luminous central nucleus strong infrared and radio sources Quasars – Quasi-stellar Object (QSOs) Central source so luminous appears star-like 3C 273

Some history Twinkle, twinkle, quasi-star, Biggest puzzle from afar. How unlike the other ones, Brighter than a trillion Suns. Twinkle, twinkle, quasi-star, How I wonder what you are! - George Gamow 3C273

The central engine for active galaxies, radio galaxies, quasars -- supermassive black holes

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