Difference between revisions of "Clusters"
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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 | ||
| + | * What is pleides? What is its mass? | ||
| + | * Tell me about globular clusters in a Galaxy. (SR) (Variation, (PJ): What is a globular cluster?) | ||
| + | ** 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) | ||
| + | |||
| + | * How many globular clusters are there in the galaxy? | ||
| + | * How far are they typically from Sag A*? | ||
| + | * How does the average mass of a globular cluster in stars compare to the MW disk? | ||
| + | * How can one determine the mass of of a globular cluster from its velocity dispersion? | ||
| + | * How does one infer velocities perpendicular to the line of sight in order to measure the velocity dispersion? | ||
| + | |||
| + | 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? | ||
| + | |||
| + | |||
| + | [[Astrophysics]] | ||
Latest revision as of 17:42, 25 April 2011
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) (Variation, (PJ): What is a globular cluster?)
- 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)
- How many globular clusters are there in the galaxy?
- How far are they typically from Sag A*?
- How does the average mass of a globular cluster in stars compare to the MW disk?
- How can one determine the mass of of a globular cluster from its velocity dispersion?
- How does one infer velocities perpendicular to the line of sight in order to measure the velocity dispersion?
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?
