- Einstein Cross
Quasar
name = QSO 2237+0305
epoch =J2000
ra = RA|22|40|31
dec = DEC|+3|21|30.3
constellation name = Pegasus
z = 1.695
dist_ly = 8,000,000,000ly (2,500,000,000) pc
type =LeQ
appmag_v =16.78
size_v = 0.870´ X 0.338´
notes =
names =LEDA 69457, Z 378-15,HUCHRA'S LENS 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 year s from Earth, while the lensing galaxy is located at a distance of 400 million light years. [cite web | last = NASA and ESA | date =September 13 1990 | url = http://hubblesite.org/newscenter/newsdesk/archive/releases/1990/20/image/a | title = The Gravitational Lens G2237 + 0305 | work = HubbleSite | accessmonthday = July 25 | accessyear = 2006]The Einstein Cross can be found in Pegasus at 22h40m30.3s +3d21m31s. [cite web|url=http:///ourworld.compuserve.com/homepages/dstrange/eincross.htm|title=Einstein Cross]
See also
*
Einstein ring (Chwolson ring)
*Gravitational lensing
*Quasar
*Twin Quasar References
* [http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=QSO+2237%2B0305+&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id Simbad]External links
* [http://www.skyhound.com/sh/archive/sep/Q2237+0305A.html Information about Einstein's Cross on Skyhound.com]
* [http://www.astronomy-mall.com/Adventures.In.Deep.Space/crossch.htm Einstein's Cross core]
* [http://www.astronomy-mall.com/Adventures.In.Deep.Space/crossobsrpt.htm Einstein's Cross by Jay Reynolds Freeman]
* [http://antwrp.gsfc.nasa.gov/apod/ap070311.html Photo of the Einstein Cross] at [Astronomy Picture of the Day|Astronomy Picture of the Day (March 11 ,2007 )]
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