Assuming the mass of the stars and gas within NGC 5055 is $8\times10^{10} M_{sun}$. What is the percentage of the dark matter in it?


closed as unclear what you're asking by peterh, Kyle Oman, Kyle Kanos, innisfree, Jon Custer Feb 27 '17 at 14:01

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    $\begingroup$ The percentage of the punctuations in your text is exactly 0% and it is clearly visible that you dont even try to formulate a clear question this is why your question is now it the very low quality review queue I suggest to fix it ASAP $\endgroup$ – peterh Feb 27 '17 at 1:02
  • $\begingroup$ Yeah this question demonstrate very little effort and also provides very little conceptual elements. $\endgroup$ – ZeroTheHero Feb 27 '17 at 5:19

As a first estimate you can use the cosmological ratio of dark matter to baryonic matter which is about 5 to 1. So the mass of dark matter would be $4*10^{11} M_{\rm sun}$. This will probably be a slight over estimate as galaxies generally have a slightly lower ratios compared to the cosmological average. A more accurate estimate can be inferred from the line of sight velocities of the stars in NGC 5055.


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