spacer
 
Advanced Search
Astrobiology Magazine Facebook  Astrobiology Magazine Twitter
MACS 1206: A Galaxy Cluster Gravitational Len
10/17/11
It is difficult to hide a galaxy behind a cluster of galaxies. The closer cluster's gravity will act like a huge lens, pulling images of the distant galaxy around the sides and greatly distorting them. This is just the case observed in the above recently released image from the CLASH survey with the Hubble Space Telescope. The cluster MACS J1206.2-0847 is composed of many galaxies and is lensing the image of a yellow-red background galaxy into the huge arc on the right. Careful inspection of the image will reveal at least several other lensed background galaxies -- many appearing as elongated wisps. The foreground cluster can only create such smooth arcs if most of its mass is smoothly distributed dark matter -- and therefore not concentrated in the cluster galaxies visible. Analyzing the positions of these gravitational arcs also gives astronomers a method to estimate the dark matter distribution in galaxy clusters, and infer from that when these huge conglomerations of galaxies began to form. Credit: NASA, ESA, M. Postman (STScI), and the CLASH Team
MACS 1206: A Galaxy Cluster Gravitational Len
Add to My Astro


 

Previous | 491-500 | 501-510 | 511-520 | 521-530 | 531-540 | 541-550 | 551-560 | 561-570 | 571-580 | 581-590 | 591-600 | Next  

 

 

 

About Us
Contact Us
Links
Sitemap
Podcast Rss Feed
Daily News Story RSS Feed
Latest News Story RSS Feed
Learn more about RSS
Chief Editor & Executive Producer: Helen Matsos
Copyright © 2014, Astrobio.net