Evidence or arguments for possible giant black holes in the centers of galaxies

Question

Evidence or arguments for possible giant black holes in the centers of galaxies comes in part from:

a. potential explanations for quasar energy sources.
b. the absence of light from these regions.
c. the appearance of relativistic jets from the nuclei of many different galaxies..
d. large Doppler shifts (blue and red) from stars in the central region of certain giant elliptical galaxies.
e. a full explanation of the missing mass problem.

(There can be multiple correct answers or no correct answers)

Explanation / Answer

Evidence or arguments for possible giant black holes in the centers of galaxies comes in part from:

large Doppler shifts (blue and red) from stars in the central region of certain giant elliptical galaxies.
and
the appearance of relativistic jets from the nuclei of many different galaxies
and
the absence of light from these regions
hence optoin b. c. and d.

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