What is the nature of the gas that elliptical galaxies typically possess, as opposed to the cold gas they lack?

Answer

Extremely hot, ionized gas that emits X-rays

While lacking cold gas, elliptical galaxies do possess gas, but it is usually extremely hot and ionized, emitting X-rays, which prevents it from condensing into new stars.

What is the nature of the gas that elliptical galaxies typically possess, as opposed to the cold gas they lack?
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