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Abell 383 (Cluster of Galaxies)


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Abell 383
Cluster of Galaxies (銀河団)



星座 (Constellation)

エリダヌス座 (Eri) (Eridanus)


距離 (Distance)

23億光年 (2.3 billion light-years)

Abell 383 is a cluster of galaxies located 2.3 billion light years from the Earth in the constellation Eridanus.

Abell 383 (Cluster of Galaxies) : Picture

Abell 383 (Cluster of Galaxies)
Abell 383 (Cluster of Galaxies)
(C) X-ray: NASA/CXC/Caltech/A.Newman et al/Tel Aviv/A.Morandi & M.Limousin; Optical: NASA/STScI, ESO/VLT, SDSS
Two teams of astronomers have used data from Chandra and other telescopes to map the distribution of dark matter in three dimensions in the galaxy cluster Abell 383. The dark matter in Abell 383 is stretched out like a gigantic football with the point of the football aligned close to the line of sight. The X-ray data from Chandra show the hot gas, which is by far the dominant type of normal matter in the cluster. Galaxies are shown with the optical data from the Hubble, the Very Large Telescope, and the Sloan Digital Sky Survey.

Abell 383
Annotated view of Abell 383
(C) NASA, ESA, J. Richard (CRAL) and J.-P. Kneib (LAM). Acknowledgement: Marc Postman (STScI)
The giant cluster of elliptical galaxies in the centre of this image contains so much dark matter mass that its gravitational field bends light. This means that for very distant galaxies in the background, the cluster acts as a sort of magnifying glass, bending and concentrating the distant object’s light towards Hubble. These gravitational lenses are one tool astronomers can use to extend Hubble’s vision beyond what it would normally be capable of seeing.

Using Abell 383, a team of astronomers have identified and studied a galaxy so far away we see it as it was less than a billion years after the Big Bang. It is visible as two tiny dots (labelled) on either side of the bright cluster galaxy in the centre. Distant objects seen through gravitational lenses are typically multiply imaged and heavily distorted.

Viewing this galaxy through the gravitational lens meant that the scientists were able to discern many intriguing features that would otherwise have remained hidden, including that its stars were unexpectedly old for a galaxy this close in time to the beginning of the Universe. This has profound implications for our understanding of how and when the first galaxies formed, and how the diffuse fog of neutral hydrogen that filled the early Universe was cleared.

Abell 383 (Cluster of Galaxies)
Abell 383 (Cluster of Galaxies)
(C) X-ray: NASA/CXC/Caltech/A.Newman et al/Tel Aviv/A.Morandi & M.Limousin; Optical: NASA/STScI, ESO/VLT, SDSS

Abell 383 Abell 383
X-ray: Abell 383
(C) NASA
Optical: Abell 383
(C) NASA
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Abell 383 (Cluster of Galaxies) : Movie

Abell 383 in 60 Seconds
Dark matter is mysterious. We know that it is invisible material that does not emit or absorb any type of light, but we can detect it through the gravitational effects it has on material we can see.
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