dark halo

dark halo

The large region around our Galaxy and other galaxies that is believed to contain distributed dark matter. Its presence is revealed from the shape of rotation curves. See Galaxy.
References in periodicals archive ?
These are among the most observationally interesting craters on the Moon because their floors are cut by concentric fractures and ridges, and they often contain rilles, dark halo craters, and ponds of lava.
In a paper published in Nature Chemical Biology, the team exposed bacteria to gold ions; a dark halo of gold particles around the colonies indicated that de-solubilization was happening outside the cell.
Instead of being spherical, the dark halo might be elongated and shaped more like a cigar, a squashed beach ball or a rugby ball.
According to Thomas, studies of the total mass are important, but "the crucial point is to determine whether the mass is in the black hole, the stars, or the dark halo.
Edge transitions are emphasized with a light and dark halo effect similar to Unsharp Mask.
Thus, they appear as transparent, highly detailed negative images within a dark halo of stain (Figure 5B).
Another youth lies sprawled on the sidewalk in a pool of blood that creates a dark halo around his head.
These small pits, known as dark halo craters, excavated underlying mare lavas and spread them as pulverized debris on top of the ray.
Kuo and his colleagues identified 32 visible features--such as a dark halo or a region with mixed textures--that at least two radiologists could independently identify as present or not.
Similar volcanic, dark halo craters also appear on the floor of Atlas.
that may lead to significant changes in the properties of the dark halo compared to the ones we would get if there was no galaxy there," he says.
The Moon also has some small-scale volcanic features--sinuous rilles, dark halo craters, and domes (July issue, page 20).