Abell 520

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Abell 520
300px
Abell 520. Imaged January 2012.
Credit: NASA
Observation data (Epoch J2000)
Constellation(s) Orion
Right ascension 04h 54m 03.80s[1]
Declination +02° 53′ 33.00″[1]
Number of galaxies 289+[2]
Richness class 3[3]
Bautz-Morgan classification III[3]
Velocity dispersion 1,066 km/s[2]
Redshift 0.2[4][5]
Distance
(co-moving)		 811 Mpc (2,645 Mly) h−1
0.705 [1]
ICM temperature 9.8 keV[5]
Binding mass 17×1014 h−1
0.70[2] M☉
X-ray luminosity 14.44×1044 erg/s (0.1–2.4 keV)[5]
X-ray flux 8.4×10−12 erg s−1 cm−2 (0.1–2.4 keV)[5]
Other designations
The Train Wreck Cluster
See also: Galaxy groups, Galaxy clusters, List of galaxy clusters
File:A520 comp.jpg
A520 pictured in X-ray, optical, and an inferred mass distribution based on the observed weak gravitational lensing. Imaged April 2007.

The Abell 520 galaxy cluster possesses an unusual substructure resulting from a major merger. It has been popularly nicknamed The Train Wreck Cluster,[6][7][8] due to its chaotic structure, and is classified as a Bautz-Morgan type III cluster.[3] It is at a co-moving radial distance of 811 Mpc (2,645 Mly) and subtends 25 arcminutes on the sky.[1] Analysis[2] of the motions of 293 galaxies in the cluster field suggested that Abell 520 was a cluster forming at the crossing of three filaments of the large scale structure

The surprising substructure of Abell 520 was reported in 2007 from a weak gravitational lensing study based on Canada-France-Hawaii-Telescope (CFHT) imaging data. It was surprising because the study found the "dark core" with a significant amount of mass in the region, where there is no concentration of bright cluster galaxies. No conventional understanding of dark matter can explain this peculiar concentration of dark matter. One interesting interpretation is that the substructure may arise from non-gravitational interaction of dark matter.

However, in the year 2012 two international teams of astronomers published conflicting results on Abell 520. While one study[9] based on the Wide Field Planetary Camera 2 (WFPC2) on Hubble Space Telescope (HST) confirmed the previous claim of the dark core in Abell 520, the other study[10] based on the Advanced Camera for Surveys (ACS) did not support the claim.

In 2014, the conflicts were resolved by the study,[11] which analyzed the data from both teams and showed that in fact the ACS data also confirm the presence of the dark core. Currently, the "dark core" mystery in Abell 520 still remains.

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 Table 3, page 24 in Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 5.3 Lua error in package.lua at line 80: module 'strict' not found.
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  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
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  10. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  11. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

Coordinates: Sky map 04h 54m 03.80s, +02° 53′ 33.00″

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