Dark matter-baryons separation at the lowest mass scale: the Bullet Group

F. Gastaldello, M. Limousin, G. Foëx +13

We report on the X-ray observation of a strong lensing selected group, SL2S J08544-0121, with a total mass of $2.4\pm 0.6\times 10^{14}$ ${\mathrm{M}}_{\odot }$ which revealed a separatio…