Unformatted text preview: n ( z ) = n exp(z/z h ). Suppose you do a survey of G2 stars in the direction of the North Galactic Pole complete to a magnitude m v = 30. What value would you obtain for V / V max ? 3. Compute expressions for the potential and kinetic energies of the singular isothermal sphere. Assume the temperature is 20 K. Suppose the sphere’s boundary is where it’s pressure is the same as that of the warm phase in the ISM. What is the radius of the sphere if its mass is 10 M ± ? What will happen if the sphere cools uniformly?...
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 Spring '11
 Lattimer
 Thermodynamics, Galaxies, Energy, Fundamental physics concepts, stromgren sphere

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