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 ...

We examine the out-of-equilibrium dynamical evolution of density profiles of ultrasoft particles under time-varying external confining potentials in three spatial dimensions. The theoretical formalism employed is the dynamical density functional theory (DDFT) of Marini Bettolo Marconi and Tarazona [J. Chem. Phys. 110, 8032 (1999)], supplied by an equilibrium excess free energy functional that i...

We study the peculiar velocity field inferred from the Mark III spirals using a new method of analysis. We estimate optimal values of Tully-Fisher scatter and zero-point offset, and we derive the 3-dimensional rms peculiar velocity (σv) of the galaxies in the samples analysed. We check our statistical analysis using mock catalogs derived from numerical simulations of CDM models considering meas...

1 Rosancff, A. J., and Florence Orr, A study of insanity in the light of the Mendelian theory, Amer. J. Insanity, 68, 221-261 (1911), also Eugenics Record Ofice BsU., No. 5. 2 Ridin, E., Einige Wege und Ziele der Familienforschung, mit Rucksicht auf die Psychiatrie, Zs. ges. Neurol. Psychiat., 7 (Hft. 5), 487-585 (1911). 8 Galton, F., History of Twins, in Inquiries into human faculty and its de...

The interpretation of the results of experiments designed to search for elementary particle dark matter in the Milky Way halo relies on specific suppositions concerning the local mass density and velocity distribution of the unseen particles. Predicted detection rates have all been computed under the assumptions that the halo density profile is smooth, and the velocity distribution is at least ...