Abell 1689
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| Abell 1689 | |
|---|---|
 Hubble view of galaxy cluster Abell 1689. It combines both visible and infrared data, with a combined exposure time of over 34 hours.[1] | |
| Observation data (Epoch J2000) | |
| Constellation(s) | Virgo |
| Right ascension | 13h 11m 34.2s[2] |
| Declination | −01° 21′ 56″ |
| Richness class | 4[3] |
| Bautz–Morgan classification | II-III[3] |
| Redshift | 0.1832[2] |
| Distance | 754 Mpc (2,459 Mly) h−1 0.705[2] |
| X-ray flux | (14.729 ± 8.1%)×10−11 erg s−1 cm−2 (0.1–2.4 keV)[2] |
Abell 1689 is a galaxy cluster in the constellation Virgo over 2.3 billion light-years away.
Abell 1689 is one of the biggest and most massive galaxy clusters known and acts as a gravitational lens, distorting the images of galaxies that lie behind it.[4] It has the largest system of gravitational arcs ever found.[5]
Abell 1689 shows over 160,000 globular clusters, the largest population ever found.[6]
There is evidence of merging and gases in excess of 100 million degrees.[5] The very large mass of this cluster makes it useful for the study of dark matter and gravitational lensing.[7][8]
At the time of its discovery in 2008, one of the lensed galaxies, A1689-zD1, was the most distant galaxy found.[9][10]
Gallery
Yellow galaxies belong to the cluster itself. Red and blue are background galaxies gravitationally lensed.
Mass map of Abell 1689.
Globular clusters in Abell 1689
