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Distance to Orion KL measured with VERA

机译：使用VERA测量的与Orion KL的距离

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摘要

We present the initial results of multiepoch VLBI observations of 22 GHz H2O masers in the Orion KL region with VERA (VLBI Exploration of Radio Astrometry). With the VERA dual-beam receiving system, we carried out phase-referencing VLBI astrometry, and successfully detected the annual parallax of Orion KL to be 2.29 +/- 0.10 mas, corresponding to a distance of 437 +/- 19 pc from the Sun. The distance to Orion KL was determined for the first time with the trigonometric parallax method in these observations. Although this value is consistent with that previously reported, 480 +/- 80 pc, which was estimated from a statistical parallax method using the proper motions and radial velocities of the H2O maser features, our new results provide a much more accurate value with an uncertainty of only 4%. In addition to the annual parallax, we detected an absolute proper motion of the maser feature, suggesting an outflow motion powered by the radio source I along with the systematic motion of source I itself.
机译：我们用VERA（VLBI射电占星术）介绍了Orion KL地区22 GHz H2O masers的多纪VLBI观测的初步结果。使用VERA双光束接收系统，我们执行了VLBI相位参考相位测量，并成功检测到Orion KL的年视差为2.29 +/- 0.10 mas，对应于距太阳437 +/- 19 pc的距离。在这些观测中，首次使用三角视差法确定了与Orion KL的距离。尽管该值与先前报道的480 +/- 80 pc一致，该值是使用H2O maser特征的适当运动和径向速度通过统计视差方法估算的，但我们的新结果提供了更加准确的值，并且存在不确定性仅占4％。除了年度视差外，我们还检测到了maser特征的绝对正确运动，这表明由无线电源I驱动的流出运动以及源I本身的系统运动。

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