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The Fastest Relativistic Jets: VLBA Observations of Blazars with Apparent Speeds Exceeding 25c

机译:最快的相对论喷气机:表观速度超过25c的Blazar的VLBA观测

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We have measured peak apparent speeds of 25.6c ± 7.0c, 25.6c ± 4.4c, and 28.2c ± 6.6c in the jets of 0235+164, 0827+243, and 1406-076, respectively, based on six epochs of high-sensitivity VLBA observations at 22 and 43 GHz during 2002 and 2003 (H0 = 71 km s-1 Mpc-1, Ωm = 0.27, and ΩΛ = 0.73). These blazars had been identified as potentially having apparent speeds exceeding 40c in an earlier VLBA survey of EGRET blazars by Jorstad and coworkers. We therefore confirm (with high confidence in 0827+243, and lower confidence in 0235+164 and 1406-076) the presence of highly relativistic pattern speeds in these three jets, although not at the 40c levels reported by Jorstad and coworkers. The lower limit to the bulk Lorentz factor implied by the observed apparent speeds is Γ 25-30 in these three sources, if the pattern speeds are equal to or slower than the bulk flow speed.
机译:根据六个历时的高点,我们分别在0235 + 164、0827 + 243和1406-076的喷嘴中测得的峰值视在速度为25.6c±7.0c,25.6c±4.4c和28.2c±6.6c -灵敏度VLBA在2002年和2003年期间在22 GHz和43 GHz处观察到(H0 = 71 km s-1 Mpc-1,Ωm= 0.27,ΩΛ= 0.73)。乔斯塔德及其同事在较早的VLBA上对EGRET易爆物进行的VLBA调查中,已确定这些易燃物的视在速度可能超过40c。因此,我们确认(在0827 + 243中具有较高的置信度,而在0235 + 164和1406-076中具有较低的置信度)这三架飞机中均存在高度相对论的图案速度,尽管Jorstad及其同事报告的不超过40c。如果模式速度等于或慢于总体流动速度,则在这三个源中,观察到的视在速度所暗示的总体洛伦兹因子的下限为Γ25-30。

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