Editing 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 globular cluster?
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*How can you tell the mass and age of a cluster?
* What is the typical M/L ratio for a GC? Explain why (age, luminosity dependence on mass).
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* Draw an HR diagram for a globular cluster
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* What is pleides? What is its mass?
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* Tell me about globular clusters in a Galaxy. (SR) (Variation, (PJ): What is a globular cluster?)
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** Mass, Number of Stars, Spatial Distribution in a galaxy, Typical Ages, Number in the Milky Way and in M87...
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* What is the Spitzer instability? (SR)
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* How many globular clusters are there in the galaxy?
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* How far are they typically from Sag A*?
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* How does the average mass of a globular cluster in stars compare to the MW disk?
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* How can one determine the mass of of a globular cluster from its velocity dispersion?
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* How does one infer velocities perpendicular to the line of sight in order to measure the velocity dispersion?
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Galaxy clusters:
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* What are typical temperatures of the gas in a galaxy cluster?
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** How do we know this?/What is the emission mechanism?
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** What if the gas were instead approximately 10 to 100 K cooler.  What would the main emission mechanism be then?
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[[Astrophysics]]
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