Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-10-03
Astrophys.J.691:1337-1347,2009
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJ
Scientific paper
10.1088/0004-637X/691/2/1337
We present a weak-lensing analysis of the galaxy cluster CL J1226+3332 at z=0.89 using Hubble Space Telescope Advanced Camera for Surveys images. The cluster is the hottest (>10 keV), most X-ray luminous system at z>0.6 known to date. The relaxed X-ray morphology, as well as its high temperature, is unusual at such a high redshift. Our mass reconstruction shows that on a large scale the dark matter distribution is consistent with a relaxed system with no significant substructures. However, on a small scale the cluster core is resolved into two mass clumps highly correlated with the cluster galaxy distribution. The dominant mass clump lies close to the brightest cluster galaxy whereas the other less massive clump is located ~40" (~310 kpc) to the southwest. Although this secondary mass clump does not show an excess in the X-ray surface brightness, the gas temperature of the region is much higher (12~18 keV) than those of the rest. We propose a scenario in which the less massive system has already passed through the main cluster and the X-ray gas has been stripped during this passage. The elongation of the X-ray peak toward the southwestern mass clump is also supportive of this possibility. We measure significant tangential shears out to the field boundary (~1.5 Mpc), which are well described by an Navarro-Frenk-White profile with a concentration parameter of c200=2.7+-0.3 and a scale length of rs=78"+-19" (~600 kpc) with chi^2/d.o.f=1.11. Within the spherical volume r200=1.6 Mpc, the total mass of the cluster becomes M(r
Jee Myungkook James
Tyson Anthony J.
No associations
LandOfFree
Dark Matter in the Galaxy Cluster CL J1226+3332 at Z=0.89 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dark Matter in the Galaxy Cluster CL J1226+3332 at Z=0.89, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark Matter in the Galaxy Cluster CL J1226+3332 at Z=0.89 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-541396