Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 747, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/747/2/L42
Keywords
cosmic background radiation; dark matter; galaxies: clusters: individual (DLSCL J0916.2+2951) gravitational lensing: weak; X-rays: galaxies: clusters
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Funding
- NASA [GO1-12171X, NAS8-03060]
- NASA through STScI [GO-12377]
- Association of Universities for Research in Astronomy, Inc., under NASA [NAS5-26555]
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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 (DM). 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 DM self-interaction cross-section sigma(DM)m(DM)(-1) less than or similar to 7 cm(2) g(-1). The system is observed at least 0.7 +/- 0.2 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.
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