Einstein Cross
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This article is about a multiple imaged quasar. For the concept of an Einstein cross see gravitational lensing
| QSO 2237+0305 | |
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| Observation data (Epoch J2000) | |
|---|---|
| Constellation | Pegasus |
| Right ascension | 22h 40m 31s |
| Declination | +3° 21′ 30.3″ |
| Redshift | 1.695 |
| Distance | 8,000,000,000 ly (2,500,000,000) pc |
| Type | LeQ |
| Apparent dimensions (V) | 0.870´ X 0.338´ |
| Apparent magnitude (V) | 16.78 |
| Other designations | |
| LEDA 69457, Z 378-15, HUCHRA'S LENS | |
| See also: Quasar, List of quasars | |
The Einstein Cross or Q2237+030 or QSO 2237+0305 is a gravitationally lensed quasar that sits directly behind ZW 2237+030, Huchra's Lens. It is quadruply imaged, hence its name, Einstein Cross, forming a nearly perfect cross, with the lensing galaxy at its center.
The quasar is located about 8 billion light years from Earth, while the lensing galaxy is located at a distance of 400 million light years.[1]
The Einstein Cross can be found in Pegasus at 22h40m30.3s +3d21m31s.[2]
[edit] See also
- Einstein ring (Chwolson ring)
- Gravitational lensing
- Quasar
- Multiple images (gravitational lensing)
- Twin Quasar
[edit] References
- ^ NASA and ESA (September 13, 1990). The Gravitational Lens G2237 + 0305. HubbleSite. Retrieved on July 25, 2006.
- ^ Einstein Cross.
[edit] External links
- Information about Einstein's Cross on Skyhound.com
- Einstein's Cross core
- Einstein's Cross by Jay Reynolds Freeman
- Photo of the Einstein Cross at [[Astronomy Picture of the Day|Astronomy Picture of the Day (March 11, 2007)]]
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