When Galaxies Collide - PowerPoint PPT Presentation

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When Galaxies Collide

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When Galaxies Collide
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When Galaxies Collide

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  1. When GalaxiesCollide But first dwarf and other special galaxies

  2. Dwarf Galaxies Dwarf Galaxies are very small Only a few billion stars! Most are elliptical… None are spiral. Dwarf Galaxy Leo A companion of the Milky-Way

  3. Are galaxieswhose central cores that give off abnormal amounts of energy often more than a whole galaxy. 10% of Galaxies are active There are three types Radio Seyfert (See-furt) Quasars All seem to be caused by super-super massive black holes Active Galaxies

  4. Radio Galaxies • Center gives off energy in the radio spectrum • Caused by electrons moving near the speed of light. • Electrons are shot out in two jets creating radio producing “radio lobes”

  5. Seyfert Galaxies • An Area within less than a light year of the center gives off as much light as the rest of the galaxy • Core ejects clouds of gas at as much 10,000 km/sec ( about 3% of the speed of light!) • Some are also Radio Galaxies

  6. Quasars • Short for quasi-stellar radio source • Give of as much as 1000 times the energy the Milky-Way does! • As much as 10 billion LY away, on the edge of the Universe…thus from the beginning of time! • Few details due to extreme distance • Send out jets of gas at seemingly faster than light speeds

  7. When Galaxies Collide • Individual stars almost never collide • Larger galaxies are formed • Disk galaxies (S0) merge with surrounding globular clusters • Disks collide to form both elliptical and spiral galaxies • Colliding spirals may lose integrity and become elliptical In about four billion years the Milky Way will collide with Andromeda

  8. We know this because: More distant(thus older) groups of galaxies have … • More and smaller galaxies in the same volume • More Spirals