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

Rounding Out Last Time: Hydrogen Spectroscopy

• Balmer series
• stellar spectra: here and here; note the Balmer jump

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