Difference between revisions of "Clusters"
From PGSC Wiki
| Line 1: | Line 1: | ||
Questions in this category have been asked by | Questions in this category have been asked by | ||
| − | *How can you tell the mass and age of a cluster? | + | * How can you tell the mass and age of a globular cluster? |
| + | * What is the typical M/L ratio for a GC? Explain why (age, luminosity dependence on mass). | ||
* Draw an HR diagram for a globular cluster | * Draw an HR diagram for a globular cluster | ||
| Line 7: | Line 8: | ||
* Tell me about globular clusters in a Galaxy. (SR) | * Tell me about globular clusters in a Galaxy. (SR) | ||
** Mass, Number of Stars, Spatial Distribution in a galaxy, Typical Ages, Number in the Milky Way and in M87... | ** Mass, Number of Stars, Spatial Distribution in a galaxy, Typical Ages, Number in the Milky Way and in M87... | ||
| − | * What is the Spitzer instability? (SR) | + | * What is the Spitzer instability? (SR) |
Galaxy clusters: | Galaxy clusters: | ||
| Line 13: | Line 14: | ||
** How do we know this?/What is the emission mechanism? | ** How do we know this?/What is the emission mechanism? | ||
** What if the gas were instead approximately 10 to 100 K cooler. What would the main emission mechanism be then? | ** What if the gas were instead approximately 10 to 100 K cooler. What would the main emission mechanism be then? | ||
| − | |||
[[Astrophysics]] | [[Astrophysics]] | ||
Revision as of 16:11, 20 April 2009
Questions in this category have been asked by
- How can you tell the mass and age of a globular cluster?
- What is the typical M/L ratio for a GC? Explain why (age, luminosity dependence on mass).
- Draw an HR diagram for a globular cluster
- What is pleides? What is its mass?
- Tell me about globular clusters in a Galaxy. (SR)
- Mass, Number of Stars, Spatial Distribution in a galaxy, Typical Ages, Number in the Milky Way and in M87...
- What is the Spitzer instability? (SR)
Galaxy clusters:
- What are typical temperatures of the gas in a galaxy cluster?
- How do we know this?/What is the emission mechanism?
- What if the gas were instead approximately 10 to 100 K cooler. What would the main emission mechanism be then?
