Starry surprise in the bulge: encounter of a halo passerby

Potsdam, Germany (SPX) Jul 27, 2015

A team led by Andrea Kunder from the Leibniz Institute for Astrophysics Potsdam (AIP) measured the velocity of a sample of 100 old RR Lyrae stars* thought to reside in the Galactic bulge, the central group of stars found in most Galaxies.

It took them by surprise, when they found that one of these stars has a space velocity of almost 500 km/s – more than five times the speed expected for n —> Read More