2014MNRAS.442L..76G

Query : 2014MNRAS.442L..76G

2014MNRAS.442L..76G - Mon. Not. R. Astron. Soc., 442, L76-L80 (2014/July-3)

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

GASTALDELLO F., LIMOUSIN M., FOEX G., MUNOZ R.P., VERDUGO T., MOTTA V., MORE A., CABANAC R., BUOTE D.A., ECKERT D., ETTORI S., FRITZ A., GHIZZARDI S., HUMPHREY P.J., MENEGHETTI M. and ROSSETTI M.

Abstract (from CDS):

We report on the X-ray observation of a strong lensing selected group, SL2S J08544-0121, with a total mass of 2.4±0.6x1014 M☉ 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 cm2/g. 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.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): gravitational lensing: strong - galaxies: groups: individual: SL2S J08544-0121 - dark matter - X-rays: galaxies: clusters

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 MCS J0025.4-1222 ClG 00 25 29.381 -12 22 37.06           ~ 138 0
2 ClG 0657-56 ClG 06 58 29.6 -55 56 39           ~ 963 1
3 GAMA 3882191 G 08 54 46.5391890528 -01 21 36.952641324           ~ 20 0
4 ZwCl 1234+2916 ClG 12 36 10.24 +28 59 00.9           ~ 28 1

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