Bremsstrahlung: Free-Free Emission

• Order of Magnitude Expectations
• Theory: Classical, Non-Relativistic Case
• thermal bremsstrahlung
• self-absorption spectrum from here
• example: intracluster medium
  • galaxy clusters seen in optical light: Virgo, Coma, Abell 1689
  • intracluster medium seen in X-rays: Virgo image and spectrum, Coma, Abell 1689
• example: supernova remnants
  • Cas A: Chandra X-ray image, spectrum
  • SN 1006: Chandra X-ray image, spectrum

Radiation and Bound States

Atomic States

• order of magnitude sketch
• sketches of l states
• populating electronic states atomic data online, including, e.g., energy levels of neutral carbon, silicon
• awesome example: technetium seen in stars