drumbo
08-24-06, 01:22 PM
http://antwrp.gsfc.nasa.gov/apod/image/0608/bullet_cluster_c60w.jpg (http://antwrp.gsfc.nasa.gov/apod/image/0608/bulletcluster_comp_f2048.jpg) The Matter of the Bullet Cluster
Composite Credit: X-ray: NASA/CXC/CfA/M.Markevitch (http://arxiv.org/abs/astro-ph/0511345) et al.
Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/D.Clowe et al. (http://arxiv.org/abs/astro-ph/0608407)
Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.
Explanation: The matter in (http://chandra.harvard.edu/photo/2006/1e0657/qa.html) galaxy cluster 1E 0657-56, fondlyknown as the "bullet cluster", is shown in this composite image (http://chandra.harvard.edu/photo/2006/1e0657/).A mere 3.4 billion light-years away,the bullet cluster's individual galaxies are seen in theoptical image data, but their total mass adds up (http://antwrp.gsfc.nasa.gov/apod/ap011024.html) to far less than the mass of the cluster's two clouds of hot x-ray emitting gasshown in red.Representing even more mass than the optical galaxies and x-ray gas combined, the blue hues show the distribution of dark matter in the cluster (http://chandra.harvard.edu/xray_sources/galaxy_clusters.html).
Otherwise invisible to telescopic views, the dark matter was mapped (http://antwrp.gsfc.nasa.gov/apod/ap030814.html) by observations of gravitational lensing (http://antwrp.gsfc.nasa.gov/apod/ap040627.html) of background galaxies. In a text book example of a shock front, thebullet-shaped cloud of gas at the right was distorted during the titanic collision between two galaxy clusters (http://www.npaci.edu/enVision/v15.2/ricker.html) that created the larger bullet cluster itself. But the dark matter present has not interacted with the cluster gas except by gravity.The clear separation of dark matter (http://en.wikipedia.org/wiki/Dark_matter) and gas clouds is considered direct evidence that dark matter exists (http://antwrp.gsfc.nasa.gov/htmltest/gifcity/matter.html).
Source (http://antwrp.gsfc.nasa.gov/apod/ap060824.html)
Composite Credit: X-ray: NASA/CXC/CfA/M.Markevitch (http://arxiv.org/abs/astro-ph/0511345) et al.
Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/D.Clowe et al. (http://arxiv.org/abs/astro-ph/0608407)
Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.
Explanation: The matter in (http://chandra.harvard.edu/photo/2006/1e0657/qa.html) galaxy cluster 1E 0657-56, fondlyknown as the "bullet cluster", is shown in this composite image (http://chandra.harvard.edu/photo/2006/1e0657/).A mere 3.4 billion light-years away,the bullet cluster's individual galaxies are seen in theoptical image data, but their total mass adds up (http://antwrp.gsfc.nasa.gov/apod/ap011024.html) to far less than the mass of the cluster's two clouds of hot x-ray emitting gasshown in red.Representing even more mass than the optical galaxies and x-ray gas combined, the blue hues show the distribution of dark matter in the cluster (http://chandra.harvard.edu/xray_sources/galaxy_clusters.html).
Otherwise invisible to telescopic views, the dark matter was mapped (http://antwrp.gsfc.nasa.gov/apod/ap030814.html) by observations of gravitational lensing (http://antwrp.gsfc.nasa.gov/apod/ap040627.html) of background galaxies. In a text book example of a shock front, thebullet-shaped cloud of gas at the right was distorted during the titanic collision between two galaxy clusters (http://www.npaci.edu/enVision/v15.2/ricker.html) that created the larger bullet cluster itself. But the dark matter present has not interacted with the cluster gas except by gravity.The clear separation of dark matter (http://en.wikipedia.org/wiki/Dark_matter) and gas clouds is considered direct evidence that dark matter exists (http://antwrp.gsfc.nasa.gov/htmltest/gifcity/matter.html).
Source (http://antwrp.gsfc.nasa.gov/apod/ap060824.html)