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Interstellar gas in many galaxies is in virial equilibrium with the stars, in that the rms...

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Physics

Interstellar gas in many galaxies is in virial equilibrium withthe stars, in that the rms speed of the gas particles is the sameas the rms stellar speed. Consider a large elliptical galaxy with avirial radius of 150 kpc and a mass of 5 × 1012 solarmasses. Calculate the rms stellar velocity using the virialtheorem. Hence estimate the temperature of the interstellar gas,assuming that it is composed entirely of hydrogen.

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