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3C 66A : ウィキペディア英語版
3C 66A

3C 66A is a Blazar〔〔 located in the constellation Andromeda.
The "distance" of a far away galaxy depends on what distance measurement you use. With a redshift of 0.444,〔〔 light from this active galaxy is estimated to have taken around 4.5 billion years to reach us.〔 But as a result of the expansion of the Universe, the present (co-moving) distance to this galaxy is about 5.4 billion light-years (1647 Mpc).〔 Even at this great distance this blazar has an apparent magnitude of about 15.5.〔 Although 0.444 is used as the common redshift value, 0.3347 is a new strict lower limit "inferred through observing the far-UV absorption by the low-z IGM."
3C 66A underwent an optical outburst in 2007 August, as monitored by the Tuorla blazar monitoring program.〔
〕 The event was monitored by the Whole Earth Blazar Telescope project.
==References==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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