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Abell 85 (Cluster of Galaxies)


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Abell 85
Cluster of Galaxies (銀河団)



星座 (Constellation)

くじら座 (Cet) (Cetus)



距離 (Distance)

7億4,000万光年 (740 million light-years)

Abell 85 is a cluster of galaxies located 740 million light years from the Earth in the constellation Cetus.

Abell 85 (Cluster of Galaxies) : Picture

Abell 85 (Cluster of Galaxies) 
Abell 85 (Cluster of Galaxies)
(C) X-ray(NASA/CXC/SAO/A.Vikhlinin et al.); Optical (SDSS)
This one galaxy cluster is representative of over 80 clusters that were used to track the effects of dark energy on these massive objects over time. This galaxy cluster, Abell 85, is shown in X-ray light from NASA's Chandra X-ray Observatory and optical light from SDSS. Most of the matter in galaxy clusters is in the form of very hot gas, which emits copious amounts of X-rays. By studying clusters across large distances, astronomers have determined that dark energy has stifled their growth.

Abell 85
Abell 85: Dark Energy Found Stifling Growth in Universe
(C) X-ray (NASA/CXC/SAO/A.Vikhlinin et al.); Optical (SDSS); Illustration (MPE/V.Springel)
The composite image on the left is of the galaxy cluster Abell 85, located about 740 million light years from Earth. The purple emission is multi-million degree gas detected in X-rays by NASA's Chandra X-ray Observatory and the other colors show galaxies in an optical image from the Sloan Digital Sky Survey. This galaxy cluster is one of 86 observed by Chandra to trace how dark energy has stifled the growth of these massive structures over the last 7 billion years. Galaxy clusters are the largest collapsed objects in the Universe and are ideal for studying the properties of dark energy, the mysterious form of repulsive gravity that is driving the accelerated expansion of the Universe.

The illustration on the right shows snapshots from a simulation by Volker Springel, representing the growth of cosmic structure when the Universe was 0.9 billion, 3.2 billion and 13.7 billion years old (now). This shows how the Universe has evolved from a smooth state to one containing a vast amount of structure. Gas is shown in these snapshots, where the yellow regions are stars and the brightest structures are galaxies and galaxy clusters. The growth of these structures was initially driven only by the attractive force of gravity, but then later there was competition with the repulsive force of dark energy.

Abell 85 Abell 85
Abell 85 with Scale Bar
(C) NASA
X-ray: Abell 85
(C) NASA
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Abell 85 (Cluster of Galaxies) : Movie

Abell 85 in 60 Seconds
The composite image shows the galaxy cluster known as Abell 85, which is located about 740 million light years from Earth.
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