Question

Would you expect a gas-rich spiral galaxy, or a gas-poor elliptical galaxy, or both, or neither,...

Would you expect a gas-rich spiral galaxy, or a gas-poor elliptical galaxy, or both, or neither, to have a supermassive black hole at their center. For which kind of galaxy would a central supermassive black hole be MORE likely to be shining brightly (or would they be equally likely)?

Science   Advanced-Physics   
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Answer #1

All of the spiral galaxies as well as the elliptical galaxies discovered so far has a supermassive black hole at its center.

So, it is squally likely for a supermassive black hole at its center for both the kind of galaxies in the question.

The luminosity of any object is proportional to the fourth power of temperature.

The temperature of a black hole is depending on its mass only.

Since the mass of the central black holes in both kind of galaxies of the same magnitude, they will have the same temperature, and so, will have the same brightness.

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