View Full Version : The Case of the Missing Dark Matter

2012-Apr-18, 03:30 PM
A survey of the galactic region around our solar system by the European Southern Observatory (ESO) has turned up a surprising lack of dark matter, making its alleged existence even more of a mystery. (...)Read the rest of The Case of the Missing Dark Matter (328 words) Jason Major for Universe Today, 2012. | [...]

More... (http://www.universetoday.com/94680/the-case-of-the-missing-dark-matter/)

2012-Apr-18, 07:35 PM
Here's a link to a preprint of the paper (http://www.eso.org/public/archives/releases/sciencepapers/eso1217/eso1217.pdf). I'm surprised that this isn't the talk of the town today. Seems like a staggering blow to existing DM theories.

2012-Apr-27, 03:56 PM
Also this and this:

This week a team of astronomers from the European Southern Observatory (ESO) released a study of stellar motions in the local volume of the Milky Way, our galaxy. Based on the way these stars moved (the way gravity pulled them into motion), the scientists hoped to infer the presence of Dark Matter. They did not find any. None. Nada. Zip. Zero.

http://www.spacedaily.com/reports/Do_Milky_Way_Companions_Spell_Trouble_for_Dark_Mat ter_999.html
Astronomers from the University of Bonn in Germany have discovered a vast structure of satellite galaxies and clusters of stars surrounding our galaxy, stretching out across a million light-years. The work challenges the existence of dark matter, part of the standard model for the evolution of the universe.

The potential consequences of the MW satellites being tidal dwarf galaxies are severe. If all the satellite galaxies and YH GCs have been formed in an encounter between the young MW and another gas-rich galaxy about 10-11 Gyr ago, then the MW does not have any luminous dark-matter substructures and the missing satellites problem becomes a catastrophic failure of the standard cosmological model.