Abell 2744
| Abell 2744 | |
|---|---|
 Abell 2744, nicknamed Pandora's Cluster. The galaxies in the cluster make up less than five percent of its mass. The gas (around 20 percent) is so hot that it shines only in X-rays (coloured red in this image). The distribution of invisible dark matter (making up around 75 percent of the cluster's mass) is coloured here in blue. | |
| Observation data (Epoch J2000) | |
| Constellation(s) | Sculptor |
| Right ascension | 00h 14m 19.51s [1] |
| Declination | −30° 23′ 19.18″ [1] |
| Richness class | 3[2] |
| Bautz–Morgan classification | III[2] |
| Redshift | 0.30800[3] |
| Distance | 1,221 Mpc (3,982 Mly) h−1 0.705 [3] |
| X-ray flux | (5.805 ± 4.7%)×10−13 erg s-1 cm-2 (0.1—2.4 keV) [3] |
| Other designations | |
| Pandora's Cluster | |
Abell 2744, nicknamed Pandora's Cluster, is a giant galaxy cluster resulting from the simultaneous pile-up of at least four separate, smaller galaxy clusters that took place over a span of 350 million years.[1] The galaxies in the cluster make up less than five percent of its mass.[1] The gas (around 20 percent) is so hot that it shines only in X-rays.[1] Dark matter makes up around 75 percent of the cluster's mass.[1]
This cluster also shows a radio halo along with several other Abell clusters. It has a strong central halo, along with an extended tail, which could either be relic radiation, or an extension of the central halo.[4]
“We nicknamed it Pandora’s Cluster because so many different and strange phenomena were unleashed by the collision.”[5]
References
- ^ a b c d e f "Pandora's Cluster – Clash of the Titans". NASA.
- ^ a b Abell, George O.; Corwin, Harold G., Jr.; Olowin, Ronald P. (May 1989). "A catalog of rich clusters of galaxies" (PDF). Astrophysical Journal Supplement Series. 70 (May 1989): 1–138. Bibcode:1989ApJS...70....1A. doi:10.1086/191333. ISSN 0067-0049. Retrieved March 13, 2012.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ a b c "NED results for object ABELL 2744". NASA/IPAC Extragalactic Database (NED). Retrieved March 17, 2012.
{{cite web}}: CS1 maint: postscript (link) - ^ http://arxiv.org/abs/astro-ph/0101418 A Comparison of Radio and X-Ray Morphologies of Four Clusters of Galaxies Containing Radio Halos - F. Govoni, T. A. Ensslin, L. Feretti, G. Giovannini
- ^ Renato Dupke quoted at Pandora's Cluster - a galactic crash investigation Press release of 22 June 2011
- ^ Clavin, Whitney; Jenkins, Ann; Villard, Ray (7 January 2014). "NASA's Hubble and Spitzer Team up to Probe Faraway Galaxies". NASA. Retrieved 8 January 2014.
External links
- Image in the visible sectra -Hubble spacetelescope(Lars Holm Nielsen et al) retrieved 20/09/2011
- Video simulation of the merging events that created Abell 2744- Hubble space telescope (Lars Holm Nielsen et al) retrieved 20/09/2011
See also
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