3C 66A
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3C 66A is a blazar[1][2] 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,[1][2] light from this active galaxy is estimated to have taken around 4.5 billion years to reach us.[2] 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).[2] Even at this great distance this blazar has an apparent magnitude of about 15.5.[1] 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."[3]
3C 66A underwent an optical outburst in 2007 August, as monitored by the Tuorla blazar monitoring program.[4] The event was monitored by the Whole Earth Blazar Telescope project.
References
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<references />, or <references group="..." />External links
- Wikisky image of 3C 66A with 3C 66B (PGC 9067) near the lower left
- The galaxy 3C 66B with 3C 66A in the North-West
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