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

Abstract

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 separation of $124\pm 20$ 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.

arXiv comment5 pages, 3 figures. Accepted for publication in MNRAS Letters. Typos corrected

References in corpus (23)

• The Leiden/Argentine/Bonn (LAB) Survey of Galactic HI: Final data release of the combined LDS and IAR surveys with improved stray-radiation corrections
• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Direct constraints on the dark matter self-interaction cross-section from the merging galaxy cluster 1E0657-56
• Cosmology and fundamental physics with the Euclid satellite
• Detecting Bimodality in Astronomical Datasets
• The structural and scaling properties of nearby galaxy clusters - II. The M-T relation
• A Catalog of Galaxy Clusters Observed by XMM-Newton
• The resolved fraction of the Cosmic X-ray Background
• Revealing the properties of dark matter in the merging cluster MACSJ0025.4-1222
• Creation of cosmic structure in the complex galaxy cluster merger Abell 2744
• The CFHTLS Strong Lensing Legacy Survey: I. Survey overview and T0002 release sample
• The CFHTLS-Strong Lensing Legacy Survey (SL2S): Investigating the group-scale lenses with the SARCS sample
• Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation
• Statistical Tools for Classifying Galaxy Group Dynamics
• The Dynamics of Merging Clusters: A Monte Carlo Solution Applied to the Bullet and Musket Ball Clusters
• Cluster Bulleticity
• Constraining the Collisional Nature of the Dark Matter Through Observations of Gravitational Wakes
• Scaling Rrelation in two situations of extreme mergers
• Bullet Clusters in the MareNostrum Universe
• SARCS strong lensing galaxy groups: I - optical, weak lensing, and scaling laws
• Strong Lensing as a Probe of the Mass Distribution Beyond the Einstein Radius. Mass & Light in SL2S J08544-0121, a Galaxy Group at z=0.35
• Dynamical analysis of strong-lensing galaxy groups at intermediate redshift
• The Burst Cluster: Dark Matter in a Cluster Merger Associated with the Short Gamma Ray Burst, GRB 050509B

Cited by in corpus (16)

• The non-gravitational interactions of dark matter in colliding galaxy clusters
• Constraints on dark matter self-interaction from the internal density profiles of X-COP galaxy clusters
• A Hydrodynamical Solution for the "Twin-Tailed" Colliding Galaxy Cluster "El Gordo"
• Dark matter dynamics in Abell 3827: new data consistent with standard Cold Dark Matter
• SARCS strong-lensing galaxy groups: II - mass-concentration relation and strong-lensing bias
• The unrelaxed dynamical structure of the galaxy cluster Abell 85
• Astrophysical Tests of Dark Matter Self-Interactions
• Simulations of the merging galaxy cluster Abell 2034: what determines the level of separation between gas and dark matter
• The MeSsI (Merging Systems Identification) Algorithm & Catalogue
• The matter distribution in z ~ 0.5 redshift clusters of galaxies. II : The link between dark and visible matter
• Characterizing SL2S galaxy groups using the Einstein radius
• Combining Strong Lensing and Dynamics in Galaxy Clusters: integrating MAMPOSSt within LENSTOOL I. Application on SL2S J02140-0535
• Constraints on Self-Interacting dark matter from relaxed galaxy groups
• Dissociation of dark matter and gas in cosmic large-scale structure
• Protruding bullet heads indicating dark matter pull
• A test of MOND and Emergent Gravity with SMACS J0723.3-7327 using eROSITA observations