Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2011-10-19
2012 ApJ 747 L42
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
Accepted ApJ Letters. [v2] changes: 1 new figure (2b), figure 3 made color, and minor improvements to the text. 6 pages, 4 fig
Scientific paper
10.1088/2041-8205/747/2/L42
We present DLSCL J0916.2+2951 (z=0.53), a newly discovered major cluster merger in which the collisional cluster gas has become dissociated from the collisionless galaxies and dark matter. We identified the cluster using optical and weak lensing observations as part of the Deep Lens Survey. Our follow-up observations with Keck, Subaru, Hubble Space Telescope, and Chandra show that the cluster is a dissociative merger and constrain the dark matter self-interaction cross-section {\sigma}_{DM}m_{DM}^{-1}\leq7 cm^2g^{-1}. The system is observed at least 0.7\pm0.2 Gyr since first pass-through, thus providing a picture of cluster mergers 2-5 times further progressed than similar systems observed to date. This improved temporal leverage has implications for our understanding of merging clusters and their impact on galaxy evolution.
Bradač Maruša
Dawson William A.
Gee Perry
Hughes John Patrick
Jee Myungkook
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