Sentences with phrase «galactic dark matter halo»

Not exact matches

By multiplying the density of the newfound cool dwarfs by the volume of the galactic halo, Oppenheimer's team estimates that white dwarfs make up, by the most conservative estimate, at least 3 % of the total galactic dark matter, they report online in Science on 23 March.

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.

Among other sources of such radiation, scientists have proposed that interactions between bits of dark matter (which make up a large fraction of the universe's mass but haven't yet been directly detected) in a halo around the galactic center may be creating the surplus gamma rays.

All galaxies, including our own, are believed to be embedded in and surrounded with halos of dark matter, which is what astronomers posit causes stars far from the galactic center to move as fast as those near the center.

This alignment increases Earth's net velocity through a galactic halo of dark matter particles, whose existence scientists have inferred from numerous astronomical observations.

Some are found in globular clusters, but most move in a huge cloud around the disk called the galactic halo, which has a luminous inner component defined by globular star clusters and other easily observable stars (with coronae of hot gas possibly expelled by supernovae and of high - velocity neutron stars) and an outer dark - matter component inferred from its gravitational impact on the Milky Way's spiral disk.