ASTR 1101-001 Spring 2008

1. ASTR 1101-001Spring 2008 Joel E. Tohline, Alumni Professor 247 Nicholson Hall [Slides from Lecture22]

2. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

3. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a convex lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

4. Landolt Astronomical Observatory 11.5-inch refracting telescope Location: roof of Nicholson Hall http://www.phys.lsu.edu/landoltobservatory/index.html

5. Refracting Telescope: “How it works”

6. Telescopes (Chapter 6) NOTE: A large lens is advantageous because it can collect more light in a given amount of time. The collecting area goes as the square of the radius of the lens. • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

8. 40-inch Refractor at Yerkes Observatory (near Chicago, IL)

10. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a convex lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

11. Highland Road Park Observatory(BREC park just south of Siegen Lane) 20-inch diameter reflecting telescope http://www.bro.lsu.edu

16. Telescopes (Chapter 6) NOTE: A large mirror is advantageous because it can collect more light in a given amount of time. The collecting area goes as the square of the radius of the mirror. • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

18. Reflecting Telescope:“Gemini North” in Hawaii • Primary mirror has a diameter of 8.1 meters • Secondary mirror has a diameter of 1.0 meter • Hole in primary through which light passes to reach the Cassegrain focus

19. Summit of Mauna Kea (Hawaii)

20. Hubble Space Telescope Operated by: Space Telescope Science Institute in Baltimore, Maryland www.stsci.edu

21. Hubble Space Telescope Operated by: Space Telescope Science Institute in Baltimore, Maryland www.stsci.edu NOTE: Hubble does not have a particularly large primary mirror. Hubble images are not “fuzzy,” however, because its view of objects is unhampered by atmospheric turbulence.

22. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

25. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

26. 64-meter “Parkes” Radio Telescope New South Wales, Australia

27. Very Large Array (VLA) of Radio Telescopes Socorro, New Mexico

29. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • SIRTF (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • GRO (g-ray)

30. Telescopes (Chapter 6) • Traditional ground-based optical telescopes • Refracting (light passes through a lens) • Reflecting (light bounces off a concave mirror) • Telescopes for wavelengths outside the visible part of the EM spectrum • Ground-based radio telescopes and telescope arrays • Space-based satellite telescopes • Spitzer Space Telescope (infrared) • Hubble Space Telescope (visible and ultraviolet) • Chandra & XMM (x-ray) • Compton Gamma-Ray Observatory (g-ray)

31. Spitzer

32. Spitzer Space Telescope(infrared)

33. Hubble

34. Hubble Space Telescope (visible & UV) Operated by: Space Telescope Science Institute in Baltimore, Maryland www.stsci.edu

35. Chandra & XMM

36. Chandra X-ray Observatory

38. Compton GRO

39. Compton Gamma-Ray Observatory (CGRO)