If applying typical mass percentage estimates, what range of the total mass budget is attributed to the Dark Matter component in the halo?
Answer
75-90%.
When modeling the typical mass distribution within a spiral galaxy based on rotational curves, the dominant constituent by far is the non-luminous Dark Matter residing in the halo. Estimates derived from these models generally place the mass percentage for Dark Matter in the range of 75% to 90% of the total mass inventory. This massive, unseen component forms the gravitational scaffold upon which the luminous structures—the disk containing the stars, gas, and dust (which together account for only about 10-25% of the mass)—are suspended.
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