Nov 13 & 14: Iben Lecturer Prof. Wendy Freedman, U. Chicago

Awesome Example: Quasar Absorption Line Systems

• composite quasar UV/optical spectrum from SDSS: Vanden Berk+ (2001)
• Lyman-alpha forest: cartoon and spectrum
• a damped Lyman-alpha system

The Lyman Limit

• physics, data
• awesome example: QSO absober Lyman limit systems

"Metal" Lines

• physics: resonance lines
• astrophysics: atmospheric opacity
• awesome examples:
  • in the solar spectrum
  • in quasar spectra

The 21 cm Line

• physics: hyperfine splitting
• awesome examples:
  • the sky in 21 cm; disk map: velocity-colored and in velocity space
  • galaxy M33 in optical and in 21 cm
  • galaxy rotation curves at 21 cm
  • cosmic 21 cm radiation evidence for monopole and fluctuations; LOFAR, SKA