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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. Four images of the same distant quasar appear around a foreground galaxy due to strong gravitational lensing. The quasar's redshift indicated that it is located about 8 billion light years from Earth, while the lensing galaxy is at a distance of 400 million light years. The apparent dimension of the galaxy are 0.87x0.34 arcminutes, while the apparent dimension of the cross in its centre accounts for only 1.6x1.6 arcseconds. The Einstein Cross can be found in Pegasus at , . Amateur astronomers are able to see some of the cross using telescopes but it requires extremely dark skies and telescope mirrors with diameters of or greater.〔 〕 The individual images are labelled A through D (i.e. ''QSO 2237+0305 A''), the lensing galaxy is sometimes referred to as ''QSO 2237+0305 G''. == See also == * Cloverleaf Quasar * Einstein ring (Chwolson ring) * Gravitational lensing * Quasar * SN Refsdal * Twin Quasar 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Einstein Cross」の詳細全文を読む スポンサード リンク
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