|White Rose Galaxy|
Petal-like shells of the giant early-type galaxy PGC 6240
|Observation data (J2000 epoch)|
|Right ascension||01h 41m 30.906s|
|Declination||−65° 36′ 56.4″|
|Distance||345,000 kly (106,000 kpc)|
|6dFGS gJ014131.0-653656, AM 0139-655|
PGC 6240, also known as AM 0139-655 or the White Rose Galaxy, is a very large and old galaxy in the southern constellation of Hydrus, about 345 million light years away from Earth. It was discovered by NASA scientists in October 2013 using the Hubble Space Telescope.
Appearing like a white rose in the sky, the galaxy has foggy shells of stars that rotate around a luminous center with few shells lying close to it while others at a distance. Those distant from the center appear disconnected from the white rose.
The 'White Rose' galaxy intrigues astronomers because the differing ages of its globular clusters; there are a population of relatively young globular clusters around 400 million years old, another group of older ones around 1 billion years old, and older ones still. The ages of the younger two align with the ages of the shells around the galaxy proper. This suggests that the younger clusters and shells formed in bouts of starburst star formation following the merger of the galaxy with another.
Notes and References
- Malin, DF; Carter D (1983). "A catalog of elliptical galaxies with shells". Astrophysical Journal. 274 1: 534–540. Bibcode:1983ApJ...274..534M. doi:10.1086/161467. Retrieved 13 October 2013.
- Maybhate, Aparna (2007). "Evidence for Three Subpopulations of Globular Clusters in the Early-Type Poststarburst Shell Galaxy AM". Astronomical Journal. 1729 134: 139–655. arXiv:0707.3133. Bibcode:2007AJ....134.1729M. doi:10.1086/521817.
- Lazaro, Enrico de (Oct 11, 2013). "PGC 6240: Astronomers Spot Distant ‘White Rose’ Galaxy". sci-news.com. Retrieved 13 October 2013.