Carina Nebula
Carina Nebula
Measurement:
Extinction (including red shift) of Electromagnetic Radiation
Polarization of light
Measurement:| Type of ISM | Comment | Density (Molecules/cm3) |
Temperature (K) | Mass (MSun) | Size (ly) |
|---|---|---|---|---|---|
| Cold Atomic | Atomic Hydrogen In Equilibrium |
10-20 | 50 | 1000 | 30 mean separation 500ly |
| Warm Atomic | Atomic Hydrogen In equilibrium |
0.1 | 5000 | This and Cold make 50% of all ISM Mass | Small Fraction of Volume |
| Coronal Gas | Typical of Solar Area Heated by Supernova |
0.01 | 1,000,000 | very small | 50% of all volume |
| Molecular Clouds | H2 not detectible CO radiation used to map locations Not in gravitational equilibrium |
1000-10,000 | ~10 | ~<1,000,000 50% of ISM mass! |
50-100 (< 1% of space) |
| HII Regions | associated with Molecular Clouds Hot and expanding |
100-1000 | 10,000 | Small fraction | Small fraction of volume |