Does modified gravity somehow explain galaxies that don't need it?

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SUMMARY

The discussion focuses on the explanation of certain galaxies that exhibit behavior consistent with visible matter alone, negating the need for dark matter or modified gravity theories. Specific galaxies mentioned include NGC1277, which is classified as a lenticular galaxy, and DF2 and DF4, which present unique cases. Both the ΛCDM and MOND models provide similar interpretations regarding these galaxies, indicating a deficit of dark matter in their observations. The conversation emphasizes the importance of relying on scientific papers over popular articles for accurate information.

PREREQUISITES
  • Understanding of ΛCDM (Lambda Cold Dark Matter) model
  • Familiarity with MOND (Modified Newtonian Dynamics) theory
  • Knowledge of galaxy classifications, specifically lenticular galaxies
  • Ability to analyze scientific papers versus popular science articles
NEXT STEPS
  • Research the characteristics and implications of the ΛCDM model in galaxy formation
  • Explore MOND theory and its applications in astrophysics
  • Investigate the specific properties of NGC1277 and its classification as a lenticular galaxy
  • Review scientific literature on DF2 and DF4 to understand their unique characteristics
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Astronomers, astrophysicists, and students of cosmology interested in the dynamics of galaxies and the ongoing debate regarding dark matter and modified gravity theories.

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How do proponents of modified gravity explain the fact of observation of galaxies, the behaviour of matter in which does not require an explanation in the form of dark matter or modified gravity?
 
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Which galaxies are you speaking of?
 
NGC1277 is a lenticular galaxy, in between being rotationally and pressure supported. ΛCDM says those galaxies in general have a deficit of DM, and MOND says the acceleration is above the MOND turn-on. So both models say the same thing.

DF2 and DF4 are special, but a) AFAIK no other examples have been found, b) the interpretatiom depends on their distance, and c) there is some evidence that they are closer than supposed.

As a PS, popular articles tend to be substantially worse sources than the actual paper.
 
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