This article might help explain the idea of how an observation of a galaxy with no dark matter might be proof of the existence of dark matter [physicsworld.com]
In a nutshell; dark matter models predict that tidal dwarf galaxies (that is galaxies formed from the interaction of galaxies that pass close together or collide with each other) will lack dark matter due to a different formation method (stars are pulled out of host galaxies but not the dark matter). So this dwarf galaxy without dark matter would fit the current model. The problem is that the mass measurement depends upon the intrinsic luminosity of the galaxy which is calculated from its apparent luminosity and it's distance. Hence we need to be able to measure the distance accurately and so that is where the doubt of the measurement lies.
It should be relatively easy to check the research though by replicating the observations independently and trying to pin down the distance to the dwarf galaxy in question.
|Astronomers baffled by distant galaxy void of dark matter||724||Archaic||28-Mar-18 22:36|
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