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The clumping behavior of galaxies

Date:
May 28, 2014
Source:
NASA
Summary:
Active, supermassive black holes at the hearts of galaxies tend to fall into two categories: those that are hidden by dust, and those that are exposed. Data from NASA's Wide-field Infrared Survey Explorer, or WISE, have shown that galaxies with hidden supermassive black holes tend to clump together in space more than the galaxies with exposed, or unobscured, black holes.
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Fornax cluster.
Credit: NASA/JPL-Caltech

Active, supermassive black holes at the hearts of galaxies tend to fall into two categories: those that are hidden by dust, and those that are exposed. Data from NASA's Wide-field Infrared Survey Explorer, or WISE, have shown that galaxies with hidden supermassive black holes tend to clump together in space more than the galaxies with exposed, or unobscured, black holes.

This image shows galaxies clumped together in the Fornax cluster, located 60 million light-years from Earth. The picture was taken by WISE, but has been artistically enhanced to illustrate the idea that clumped galaxies will, on average, be surrounded by larger halos of dark matter (represented in purple). Because dark matter, like normal matter, has gravity, it will pull galaxies toward it, causing them to clump.

Astronomers don't know why the hidden black holes would have larger halos of dark matter, but are intrigued by the surprising finding and are investigating further.


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The above post is reprinted from materials provided by NASA. Note: Materials may be edited for content and length.


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NASA. "The clumping behavior of galaxies." ScienceDaily. ScienceDaily, 28 May 2014. <www.sciencedaily.com/releases/2014/05/140528093750.htm>.
NASA. (2014, May 28). The clumping behavior of galaxies. ScienceDaily. Retrieved September 1, 2015 from www.sciencedaily.com/releases/2014/05/140528093750.htm
NASA. "The clumping behavior of galaxies." ScienceDaily. www.sciencedaily.com/releases/2014/05/140528093750.htm (accessed September 1, 2015).

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