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Abell 520
Galaxy cluster in the constellation of Orion
Galaxy cluster in the constellation of Orion
| Field | Value | |
|---|---|---|
| name | Abell 520 | |
| image | A520-mass+xray+lum-4up-m-1.jpg | |
| caption | Abell 520. Imaged January 2012. | |
| credit | NASA | |
| epoch | J2000 | |
| ra | ||
| dec | ||
| constellation | Orion | |
| member_no | 289+ | |
| richness | 3Table 3, page 24 in {{cite journal | |
| last1 | Abell | first1 = George O. |
| author-link1 | George O. Abell | |
| last2 | Corwin | first2 = Harold G. Jr. |
| last3 | Olowin | first3 = Ronald P. |
| date | May 1989 | |
| title | A catalog of rich clusters of galaxies | |
| journal | Astrophysical Journal Supplement Series | |
| volume | 70 | |
| issue | May 1989 | |
| pages | 1–138 | |
| bibcode | 1989ApJS...70....1A | |
| doi | 10.1086/191333 | |
| doi-access | free | |
| bmtype | III | |
| velocity_dispersion | 1,066 km/s | |
| redshift | 0.2{{cite journal | |
| last1 | Struble | first1 = Mitchell F. |
| last2 | Rood | first2 = Herbert J. |
| date | November 1999 | |
| title | A Compilation of Redshifts and Velocity Dispersions for ACO Clusters | |
| journal | The Astrophysical Journal Supplement Series | |
| volume | 125 | |
| issue | 1 | |
| pages | 35–71 | |
| bibcode | 1999ApJS..125...35S | |
| doi | 10.1086/313274 | |
| doi-access | free | |
| }}</ref><ref name | "Ebeling"{{cite journal | |
| last1 | Ebeling | first1 = H. |
| last2 | Edge | first2 = A. C. |
| display-authors | etal | |
| date | December 1998 | |
| title | The ROSAT Brightest Cluster Sample - I. The compilation of the sample and the cluster log N-log S distribution | |
| journal | Monthly Notices of the Royal Astronomical Society | |
| volume | 301 | |
| issue | 4 | |
| pages | 881–914 | |
| bibcode | 1998MNRAS.301..881E | |
| doi | 10.1046/j.1365-8711.1998.01949.x | |
| doi-access | free | |
| arxiv | astro-ph/9812394 | s2cid = 119104724 |
| distance | 811 Mpc {{cite web | |
| url | http://ned.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=Abell+520&extend=no | |
| title | NED results for object ABELL 0520 - BASIC DATA for ABELL 0520 | |
| publisher | NASA/IPAC EXTRAGALACTIC DATABASE | |
| access-date | March 3, 2012 | |
| temperature | 9.8 keV | |
| mass | 17 | |
| luminosity | erg/s (0.1–2.4 keV) | |
| flux | 8.4 erg s−1 cm−2 (0.1–2.4 keV) | |
| other_names | The Train Wreck Cluster |
| author-link1 = George O. Abell | doi-access = free | doi-access = free | display-authors = etal | doi-access = free | access-date = March 3, 2012
Abell 520 (also known as A520) is a galaxy cluster in the Orion constellation, located at a co-moving radial distance of 811 Mpc and subtends 25 arcminutes on the Earth sky.
The cluster possesses an unusual substructure resulting from a major merger. It has been popularly nicknamed the Train Wreck Cluster,{{cite web | access-date = 16 August 2007 | access-date = 16 August 2007
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 at first, 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 could explain this peculiar concentration of dark matter. At the time, some thought 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{{Cite journal
In 2014, a study{{Cite journal | doi-access = free
References
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