Why are dark matter halos of ultra-diffuse galaxies so odd?

max—Vmax distributions inferred from the Read fits (colored), together with those from the TNG50-1-Dark simulations (gray circles). The solid black lines show the median relation (Diemer & Joyce 2019), as well as 0.3 and 0.6 dex larger Rmax ("lower concentration") compared to the media. The dashed black lines denote the halo masses log10(M200/M0 = 10, … Read more

No trace of dark matter halos

The dwarf galaxy NGC1427A flies through the Fornax galaxy cluster and undergoes disturbances which would not be possible if this galaxy were surrounded by a heavy and extended dark matter halo, as required by standard cosmology. Credit: ESO According to the standard model of cosmology, the vast majority of galaxies are surrounded by a halo … Read more

For the first time, scientists have systematized all the halos discovered over thousands of years of observations

A photo of a halo of diamond dust was made on December 12, 2010 in Tampere (Finland). Credit: Marko Riikonen For the first time in the history of observations, numerous scientists from the Helsinki and Ural Federal Universities, Jarmo Moilanen and Maria Gritsevich, have systematized information about all forms of atmospheric halos recorded by mankind … Read more