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TOPIC: DLSCL J0916.2+2951

Blobrana

L

Posts: 131433

Date: Apr 13 01:05 2012

RE: DLSCL J0916.2+2951	Permalink

Discovery of the Musket Ball Cluster Using a combination of powerful observatories in space and on the ground, astronomers have observed a violent collision between two galaxy clusters in which so-called normal matter has been wrenched apart from dark matter through a violent collision between two galaxy clusters. The newly discovered galaxy cluster is called DLSCL J0916.2+2951. It is similar to the Bullet Cluster, the first system in which the separation of dark and normal matter was observed, but with some important differences. The newly discovered system has been nicknamed the "Musket Ball Cluster" because the cluster collision is older and slower than the Bullet Cluster. Read more __________________

Blobrana

L

Posts: 131433

Date: Jan 11 10:16 2012

Perry's Cluster	Permalink

When galaxy clusters collide A UC Davis graduate student who is leading a study of the collision of galaxy clusters 5 billion light years away will discuss the team's findings today, Jan. 10, in a press briefing at the annual meeting of the American Astronomical Society in Austin, Texas. This "little universe" is formally called DLSCL J0916.2+2951 and consists of two clusters of hundreds of galaxies each, in the process of merging into one. It is nicknamed Perry's Cluster, after team member Perry Gee, a UC Davis research scientist who discovered it. It is similar to another merging cluster - the Bullet Cluster - but relatively further along in its development. Read more __________________

Blobrana

L

Posts: 131433

Date: Jan 10 16:56 2012

DLSCL J0916.2+2951	Permalink

Musket Ball Cluster When two clusters collide their galaxies rarely collide with one another, due to there being so much space between the galaxies. Thus galaxies can be considered collisonless particles. The cluster gas on the other hand is dispersed somewhat evenly throughout each subcluster and as a results the gas of one subcluster is much more likely to collide with the gas of the other. The result being that much of the gas will stop at the point of collision while the galaxies pass right on through. As can be seen in the images above, the mass of the cluster largely overlaps the galaxies (white contours). By comparing and contrasting the location of the mass (85% of which is dark matter) we can constrain the properties of dark matter and infer that is has an effective cross-section approximately less than that of a neutrino. Read more __________________

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