Lecture 13 - The Interstellar Medium (2/25/99)

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ASTR012 Reading:
Chapter 11-4, 15-1, 15-2 (ZG4)

pages 51 - 54

M42, the Great Nebula in Orion, a site of ongoing massive star formation.
(Courtesy Bill Arnett/Jason Ware)

? Key Question: What are the dark nebulae made of?
! Key Principle: The 21-cm HI line
# Key Problem: Mass-Luminosity Relation


  1. Interstellar Dust
  2. H II Regions
  3. Atomic and Molecular Lines in the ISM

The Interstellar Medium in Outline

  1. Gravitational Collapse
  2. A View of the Interstellar Medium
  3. What is the Interstellar Medium Made Of?
  4. Atomic Hydrogen Clouds
  5. Molecular Clouds
  6. The Orion Molecular Cloud

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smyers@nrao.edu Steven T. Myers