Atomic Hydrogen Spectra: Tools for probing galaxies

A workshop given at the 1998 meeting of the West Virginia Science Teachers Association
Ron Maddalena and Sue Ann Heatherly (NRAO)

The following are the lesson plan and handouts for the workshop. You can download the complete package as a 777 KByte ZIP file by clicking here.

• Lesson Plan
• Graph paper for sketching optical spectra using glow tubes and diffraction gratings
• Doppler Shift Illustration
  • Useful Equations
• Galaxy Images and Spectra
  • A000947
  • A012113
  • A012554
  • NGC628
  • NGC3642
  • NGC4214
  • NGC5068
  • NGC6384
  • PGC33860
  • PGC48171
• How to find the distance to a galaxy
• Calculating the mass of a galaxy
  • For the mathematically oriented students:
    • Derivation of Centripetal Force
    • Derivation of the Law of Gravity
  • How to find the size of a galaxy
    • Ruler to use with galaxy images to find the size of galaxies
  • How to find the rotational velocity of a galaxy
    • Ruler to use with galaxy spectra to find the velocity width of a galaxy's spectra.
  • Example calculation for A012113
  • Correction factor if galaxy is not completely edge on
• How to find the amount of gas in a galaxy
  • Grid to use with galaxy spectra to calculate the area under a galaxy's spectra.
• How to find the temperature of the gas in a galaxy

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