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Abell 1185 (Cluster of Galaxies)


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Abell 1185
Cluster of Galaxies (銀河団)



星座 (Constellation)



距離 (Distance)

4億光年 (400 million light-years)

Abell 1185 is a cluster of galaxies located 400 million light years from the Earth.

Abell 1185 (Cluster of Galaxies) : Picture

Abell 1185 
Galactic Collision in Cluster Abell 1185
(C) Jean-Charles Cuillandre (CFHT), Hawaiian Starlight, CFHT
What is a guitar doing in a cluster of galaxies? Colliding. Clusters of galaxies are sometimes packed so tight that the galaxies that compose them collide. A prominent example occurs on the left of the above image of the rich cluster of galaxies Abell 1185. There at least two galaxies, cataloged as Arp 105 and dubbed The Guitar for their familiar appearance, are pulling each other apart gravitationally. Most of Abell 1185's hundreds of galaxies are elliptical galaxies, although spiral, lenticular, and irregular galaxies are all clearly evident. Many of the spots on the above image are fully galaxies themselves containing billions of stars, but some spots are foreground stars in our own Milky Way Galaxy. Recent observations of Abell 1185 have found unusual globular clusters of stars that appear to belong only to the galaxy cluster and not to any individual galaxy. Abell 1185 spans about one million light years and lies 400 million light years distant.

Abell 1185 (Cluster of Galaxies)
Abell 1185 (Cluster of Galaxies)
(C) ESA/Hubble & NASA
This image from the NASA/ESA Hubble Space Telescope could seem like a quiet patch of sky at first glance. But zooming into the central part of a galaxy cluster — one of the largest structures of the Universe — is rather like looking at the eye of the storm.

Clusters of galaxies are large groups consisting of dozens to hundreds of galaxies, which are bound together by gravity. The galaxies sometimes stray too close to one another and the huge gravitational forces at play can distort them or even rip matter off when they collide with one another.

This particular cluster, called Abell 1185, is a chaotic one. Galaxies of various shapes and sizes are drifting dangerously close to one another. Some have already been ripped apart in this cosmic maelstrom, shedding trails of matter into the void following their close encounter. They have formed a familiar shape called The Guitar, located just outside the frame of this image.

Abell 1185 is located approximately 400 million light-years away from Earth and spans one million light-years across. A few of the elliptical galaxies that form the cluster are visible in the corners of this image, but mostly, the small elliptical shapes seen are faraway galaxies in the background, located much further away, in a quieter area of the Universe.

Abell 1185 Abell 1185
Abell 1185
(C) Jean-Charles Cuillandre
Abell 1185 (Cluster of Galaxies)
(C) NASA
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