使用VERA测量的与Orion KL的距离
Distance to Orion KL Measured with VERA
摘要：
本文介绍了用VERA（VLBI射电天体测量探测）对猎户座KL区22 GHz H2O脉泽进行多历元VLBI观测的初步结果。利用VERA双光束接收系统，我们进行了相位参考VLBI天体测量，成功地探测到猎户座KL的年视差为2.29 ± 0.10mas，相当于距太阳437 ± 19 pc。在这些观测中，首次用年视差法确定了猎户座KL的距离。虽然这个值与以前报道的480+/-80 pc是一致的，这是从统计视差方法估计使用自行和径向速度的H2O脉泽功能，我们的新结果提供了更准确的值，只有4%的不确定性。除了年度视差，我们已经检测到的脉泽功能的绝对自行，这表明流出运动的无线电源I随着源I本身的系统运动。
英文摘要：
We present the initial results of multi-epoch VLBI observations of the 22 GHz H2O masers in the Orion KL region with VERA (VLBI Exploration of Radio Astrometry). With the VERA dual-beam receiving system, we have carried out phase-referencing VLBI astrometry and successfully detected an annual parallax of Orion KL to be 2.29+/-0.10 mas, corresponding to the distance of 437+/-19 pc from the Sun. The distance to Orion KL is determined for the first time with the annual parallax method in these observations. Although this value is consistent with that of the previously reported, 480+/-80 pc, which is estimated from the statistical parallax method using proper motions and radial velocities of the H2O maser features, our new results provide the much more accurate value with an uncertainty of only 4%. In addition to the annual parallax, we have 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.
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