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The tools

The tools. Hot question of Galileo’s time. what’s at the centre: earth or sun?. Sun-centered universe. Galileo’s observations. 1. The Moon’s surface. Moon not a perfect “heavenly body”. Sun-centered universe. Galileo’s observations. 2. Jupiter’s moons. Jupiter has moons!

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The tools

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  1. The tools

  2. Hot question of Galileo’s time • what’s at the centre: earth or sun?

  3. Sun-centered universe Galileo’s observations. 1. The Moon’s surface Moon not a perfect “heavenly body”

  4. Sun-centered universe Galileo’s observations. 2. Jupiter’s moons Jupiter has moons! > there are things that do not orbit the Earth!

  5. Sun-centered universe Galileo’s observations. 3. Phases of Venus Venus has phases, just like the Moon Attributed them to Venus’ motion around the Sun

  6. Copernicus is right! Earth is not at the centre!

  7. Hot questions of recent time • how do stars work? • how are chemical elements made? • how big is the universe? • what are “spiral nebulae”? • what are quasars? • are there planets around other stars? • ...

  8. Better tools got us the answers

  9. Hot questions of today and tomorrow • how do planets form? • how do stars form? • how do galaxies form? • what were the first objects to form after the Big Bang?

  10. To address these questions, we need great tools

  11. What makes a great tool?

  12. Three things that count • sharpness of image • resolve structure - get into the details • wavelength coverage • go after different physical processes in the same object • ability to collect lots of light • go after faint objects • lots of detail on brighter objects

  13. from the ground from space

  14. Three things that count • sharpness of image • resolve structure - get into the details • wavelength coverage • go after different physical processes in the same object • ability to collect lots of light • go after faint objects • lots of detail on brighter objects

  15. M31 CO and optical

  16. M81: starlight & dust

  17. Three things that count • sharpness of image • resolve structure - get into the details • wavelength coverage • go after different physical processes in the same object • ability to collect lots of light • go after faint objects • lots of detail on brighter objects

  18. Bigger is better 5mm diameter 10m diameter

  19. The eye vs Keck • eye Keck advantage • photons/sec entering “instrument” : π(5/2 mm)2π(10/2 m)2 4,000,000 x • of these, actually detected: ~1% ~90% 90 x • persistence (Integration time): < 1 sec >1 hr 3600 x • bottom line: ~1.3x1012 x

  20. How do we go about it? • size • location, location location

  21. Bigger is better 5mm diameter 10m diameter

  22. How do we go about it? • size • location, location location

  23. Location, location, location • important for sharpness of image • clarity of atmoshpere (“seeing”) • or no atmosphere at all • ability to detect different wavelengths • Earth’s atmosphere absorbs light (esp. bad at IR) • so... get above the atmoshpere

  24. from the ground from space

  25. Hot questions of today and tomorrow • how do planets form? • how do stars form? • how do galaxies form? • when did the first structures (galaxies, stars...) form in the universe?

  26. The future • (A Canadian perspective)

  27. Three world-class telescopes for Canada • ALMA (2010) • JWST (2014) • TMT (2018 ? )

  28. ALMA(Atacama Large Millimetre Array) radio interferometer consisting of 64 12m antennas

  29. ALMA(Atacama Large Millimetre Array) • at 5000m elevation in the Atacama desert (Chile) • location minimizes water vapour in the atmosphere

  30. ALMA(Atacama Large Millimetre Array) • Capabilities: • star formation in the early Universe: • heat emission from dust in distant galaxies • molecular (cold) gas in distant galaxies • very high spatial resolution = study internal structures • large collecting area = high sensitivity

  31. JWST(James Webb Space Telescope) Next generation space telescope (successor to Hubble) with a 6.5m segmented mirror

  32. 2.8m diameter 6.5m (equivalent) diameter

  33. JWST(James Webb Space Telescope) • Capabilities: • infrared (heat) observations from space • very high spatial resolution: • study structural details of distant galaxies • search for planets around other stars • large collecting area = very sensitive

  34. TMT(Thirty Meter Telescope) Extremely large optical telescope with adaptive optics

  35. TMT(Thirty Meter Telescope) • 30-m diameter (duh!) • 3x bigger diameter than Keck => 9 times more collecting area • Capabilities: • huge mirror: extreme light-gathering power • adaptive optics: resolve very fine details or small separations • extremely complementary to JWST

  36. Three world-class telescopes for Canada • ALMA (2010) • JWST (2014) • TMT (2018 ? )

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