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Dark Matter in Disk Galaxies

This June, CWRU Astro graduate student Pengfei Li successfully defended his doctoral thesis "The Dark Matter Problem in Rotationally Supported Galaxies", under the supervision of Professor Stacy McGaugh. Using the high quality SPARC database of disk galaxy rotation curves, Pengfei fit rotation curves to a wide variety of dark matter halo models, providing tight constraints on the properties of the galaxies' dark matter halos. With the very large SPARC sample of 175 galaxies, Pengfei demonstrated the need for galaxies to be fit with "cored" dark matter halos rather than the cuspy halos predicted by dark matter only simulations. The cored...

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