We report the discovery of Faraday rotation toward radio source 3C?84, the active galactic nucleus in NGC 1275 at the core of the Perseus Cluster. The rotation measure (RM), determined from polarization observations at wavelengths of 1.3 and 0.9 mm, is (8.7 ± 2.3)× 105 rad m–2, among the largest ever measured. The RM remained relatively constant over a 2 yr period even as the intrinsic polarization position angle wrapped through a span of 300°. The Faraday rotation is likely to originate either in the boundary layer of the radio jet from the nucleus or in the accretion flow onto the central black hole. The accretion flow probably is disk-like rather than spherical on scales of less than a parsec, otherwise the RM would be even larger.
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机译：我们报告了法拉第向无线电源3C？84（位于英仙座星团核心的NGC 1275中的活跃银河核）旋转的发现。旋转测量值（RM）由在1.3和0.9 mm波长下的偏振观测确定，为（8.7±2.3）×105 rad m-2，是有史以来最大的测量值。即使本征极化位置角跨过300°，RM在2年的时间内仍保持相对恒定。法拉第旋转很可能起源于来自原子核的射流边界层，或者起源于中心黑洞上的吸积流。吸积流可能是盘状的，而不是小于一秒差距的球形，否则RM会更大。
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