Musket Ball Cluster

{{Short description|Collision of two galaxy clusters in the constellation Cancer}}

{{sky|09|16|10.9|+|29|48|44|5200000000}}

{{Infobox galaxy cluster

| name = Musket Ball Cluster

| image = Musketball Cluster.jpg

| caption =

| credit =

| epoch = J2000.0{{cite simbad |title= NAME Musket Ball Cluster |accessdate= 27 July 2014 }}

| constellation = Cancer

| ra = {{RA|09|16|10.9}}

| dec = {{DEC|+29|48|44}}

| brightest_member =

| member_no =

| richness =

| bmtype =

| velocity_dispersion =

| redshift = 0.53

| distance =

| temperature =

| mass =

| luminosity =

| flux =

| names = {{nobr|Musket Ball Cluster,}} {{nobr|DLSCL J0916.2+2951,}} {{nobr|SHELS J0916.2+2949}}

}}

The Musket Ball Cluster (DLSCL J0916.2+2951) is a galaxy cluster that exhibits separation between its baryonic matter and dark matter components. The cluster is a recent merger of two galaxy clusters. It is named after the Bullet Cluster, as it is a slower collision, and older than the Bullet Cluster. This cluster is further along the process of merger than the Bullet Cluster,{{cite web |url= http://chandra.harvard.edu/photo/2012/musketball/ |title= DLSCL J0916.2+2951: Discovery of the Musket Ball Cluster |author= Chandra X-Ray Observatory |publisher= Harvard University |date= 12 April 2012 }} being some 500 million years older, at 700 million years old.{{cite web |url= https://www.wired.co.uk/news/archive/2012-04/13/musket-ball-cluster |title= The Musket Ball Cluster is 500 million years older than the Bullet Cluster |author= Mark Brown |date= 13 April 2012 |publisher= Wired |access-date= 5 September 2017 |archive-url= https://web.archive.org/web/20150304160357/http://www.wired.co.uk/news/archive/2012-04/13/musket-ball-cluster |archive-date= 4 March 2015 |url-status= dead }} The cluster was discovered in 2011 by the Deep Lens Survey.{{cite journal |title= Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation |display-authors= 6 |author= Dawson, William A. |author2= Wittman, David |author3= Jee, M. James |author4= Gee, Perry |author5= Hughes, John P. |author6= Tyson, J. Anthony |author7= Schmidt, Samuel |author8= Thorman, Paul |author9= Bradač, Maruša |author10= Miyazaki, Satoshi |author11= Lemaux, Brian |author12= Utsumi, Yousuke |author13= Margoniner, Vera E. |date= 19 October 2011 |publication-date= March 2012 |arxiv= 1110.4391 |bibcode= 2012ApJ...747L..42D |doi= 10.1088/2041-8205/747/2/L42 |journal= The Astrophysical Journal Letters |volume= 747 |issue= 2 |id= L42 |page= 6 |s2cid= 119244278 }} As of 2012, it is one of the few galaxy clusters to show a separation between its dark matter and baryonic matter components. {{cite web |url=http://www.dawsonresearch.com/blog/constraining-dark-matter-with-the-musket-ball-cluster |title=Constraining Dark Matter with the Musket Ball Cluster |date=6 May 2012 |first=Will |last=Dawson |publisher=Will Dawson - Cosmology Research |url-status=dead |archive-url=https://web.archive.org/web/20150122063932/http://www.dawsonresearch.com/blog/constraining-dark-matter-with-the-musket-ball-cluster |archive-date=22 January 2015 }}