DISCOVERY OF A DISSOCIATIVE GALAXY CLUSTER MERGER WITH LARGE PHYSICAL SEPARATION

被引：117

作者：

Dawson, William A. ^{[1
]}

Wittman, David ^{[1
]}

Jee, M. James ^{[1
]}

Gee, Perry ^{[1
]}

Hughes, John P. ^{[2
]}

Tyson, J. Anthony ^{[1
]}

Schmidt, Samuel ^{[1
]}

Thorman, Paul ^{[1
]}

Bradac, Marusa ^{[1
]}

Miyazaki, Satoshi ^{[3
]}

Lemaux, Brian ^{[1
]}

Utsumi, Yousuke ^{[3
]}

Margoniner, Vera E. ^{[4
]}

机构：

[1] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[2] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[3] Grad Univ Adv Studies, Dept Astron Sci, Mitaka, Tokyo 1818588, Japan

[4] Calif State Univ Sacramento, Dept Phys & Astron, Sacramento, CA 95819 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2012年 / 747卷 / 02期

关键词：

cosmic background radiation; dark matter; galaxies: clusters: individual (DLSCL J0916.2+2951) gravitational lensing: weak; X-rays: galaxies: clusters; INTERACTION CROSS-SECTION; DARK-MATTER; STAR-FORMATION; PHOTOMETRIC REDSHIFTS; BULLET CLUSTER; DEEP SURVEY; COSMOLOGY; CONSTRAINTS; EVOLUTION; SUPERCLUSTER;

D O I：

10.1088/2041-8205/747/2/L42

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页数：6

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