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Dark matter has been a long-standing and important issue in physics, butdirect evidence of its existence is lacking. This work aims to elucidate themystery and show that the dark matter hypothesis is unnecessary. We can nicelyreproduce the observed rotation curves using only conventional Newtoniandynamics based on experimental surface brightness profiles of several galaxies.Our success is based on realizing that the mass radial distribution follows astretched exponential decay with a small exponent over a few hundredkiloparsecs. Our quantitative analysis indicates that for these four examplegalaxies, there is no need to invoke the hypothetical dark matter presentlyunknown to humans or the modified Newtonian dynamics (MOND) paradigm.

Reproducing some observed galactic rotation curves without dark matter or modified Newtonian dynamics