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

Gastaldello F.; Limousin, M; Foex, G; Munoz, RP; Verdugo, T; Motta, V; More, A; Cabanac, R.; Buote, DA; Eckert D.; Ettori S.; Fritz A.; Ghizzardi, S; Humphrey, PJ; Meneghetti M.; et. al.

Keywords: dark matter, x-rays: galaxies: clusters, gravitational lensing: strong, galaxies: groups: individual: SL2S J08544-0121

Abstract

We report on the X-ray observation of a strong lensing selected group, SL2S J08544-0121, with a total mass of 2.4 +/- 0.6 x 10(14) M-circle dot which revealed a separation of 124 +/- 20 kpc between the X-ray emitting collisional gas and the collisionless galaxies and dark matter (DM), traced by strong lensing. This source allows to put an order of magnitude estimate to the upper limit to the interaction cross-section of DM of 10 cm(2) g(-1). It is the lowest mass object found to date showing a DM-baryons separation, and it reveals that the detection of bullet-like objects is not rare and confined to mergers of massive objects opening the possibility of a statistical detection of DM-baryons separation with future surveys.

Más información

Título según WOS: Dark matter-baryons separation at the lowest mass scale: the Bullet Group
Título según SCOPUS: Dark matter-baryons separation at the lowest mass scale: The bullet group
Título de la Revista: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volumen: 442
Número: 1
Editorial: Oxford Academic
Fecha de publicación: 2014
Página de inicio: L76
Página final: L80
Idioma: English
DOI:

10.1093/mnrasl/slu058

Notas: ISI, SCOPUS