Sentences with phrase «matter halo models»

This makes PB3877 an excellent target to probe dark matter halo models,» said Andreas Irrgang, research associate at the Dr. Karl Remeis - Observatory.

Not exact matches

«First proper motions measured of stars in a small galaxy outside the Milky Way: Findings question models of dark matter halos.»

Analysis shows an unexpected preference in the direction of movement, which suggests that the standard theoretical models used to describe the motion of stars and dark matter halos in other galaxies might be invalid.

The standard model of cosmology now assumes that a galaxy forms within a vast cloud or halo of dark matter.

However, Navarro argues, models of galactic evolution show that the size of a dark matter halo correlates with that of the galaxy that forms within it.

So they plump for a model in which the brown dwarfs revealed by microlensing are part of the relatively small but heavy spheroid, while the even heavier extended dark halo is made up of the more exotic particles variously known as WIMPs or cold dark matter.

Using data obtained by other astronomers, the team created computer models of what globular clusters should look like in the presence and absence of dark matter halos.

P. Bode, J.P. Ostriker, N. Turok, Halo Formation in Warm Dark Matter Models, The Astrophysical Journal 556, 2001, 93, astro - ph / 0010389

Their calculations showed that at the point in time these galaxies existed and are observed, less than 800 million years after the Big Bang, the galaxies and their dark matter halo were among the most massive structures that the current model would tolerate.

It separates two models of the dark matter distribution in the halo of a galaxy like our Milky Way.