In nearby face-on galaxies, the electron density falls from about 50-100 cm^-3 in the inner disk to 20-35 cm^-3 in the outer disk, based on [S II] doublet ratios from MaNGA.
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Unveiling Electron Density Profile in Nearby Galaxies using SDSS MaNGA
In nearby face-on galaxies, the electron density falls from about 50-100 cm^-3 in the inner disk to 20-35 cm^-3 in the outer disk, based on [S II] doublet ratios from MaNGA.