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Articles 91 - 92 of 92
Full-Text Articles in Astrophysics and Astronomy
Testing The Dark Matter Hypothesis With Low Surface Brightness Galaxies And Other Evidence, Stacy S. Mcgaugh
Testing The Dark Matter Hypothesis With Low Surface Brightness Galaxies And Other Evidence, Stacy S. Mcgaugh
Faculty Scholarship
The severity of the mass discrepancy in spiral galaxies is strongly correlated with the central surface brightness of their disks. Progressively lower surface brightness galaxies have ever larger mass discrepancies. No other parameter (luminosity, size, velocity, morphology) is so well correlated with the magnitude of the mass deficit. The rotation curves of low surface brightness disks thus provide a unique data set with which to probe the dark matter distribution in galaxies. The mass discrepancy is apparent from R = 0, giving a nearly direct map of the halo mass distribution. The luminous mass is insignificant. Interpreting the data in …
Does Low Surface Brightness Mean Low Density?, Stacy S. Mcgaugh
Does Low Surface Brightness Mean Low Density?, Stacy S. Mcgaugh
Faculty Scholarship
We compare the dynamical properties of two galaxies at identical positions on the Tully-Fisher relation, but with different surface brightnesses. We find that the low surface brightness galaxy UGC 128 has a higher mass-to-light ratio, and yet has lower mass densities than the high surface brightness galaxy NGC 2403. This is true for the gas surface density, the stellar surface density, and the total mass density. © 1996. The American Astronomical Society. All rights reserved.