IRAS 22555+6213与VERA的三角视差：沿同一视线的源的三维视图
Trigonometric Parallax of IRAS 22555+6213 with VERA: 3-Dimensional View of Sources Along the Same Line of Sight
摘要：
本文报道了用VLBI射电天体测量探测仪（VERA）测量\r 22上H $_2$ O脉泽源三角视差的结果。年视差为0.314 $\pm$ 0.070~mas，对应距离为3.18 $^{+0.90}_{-0.66}$ ~kpc。我们的结果证实\r 22位于英仙座臂，计算出\r 22的特殊运动为$(U_{src}, V_{src}, W_{src}) = (4\pm4, -32\pm6, 8\pm6)$ ~ \kms，其中$U_{src}$、$V_{src}$和$W_{src}$分别指向银河系中心、银河系自转方向和银河系北极。\r 22、NGC 1、7538和仙王座A位于同一条视线上，在天空中的距离在2 $^{\circ}$以内。通过对\r 22和\ngc ~的运动学距离的比较，发现\r 22和\ngc ~与英仙座臂有关，而\cepa ~则位于本星系臂。\gf ~和\r 22~用其视差距离推导出平坦和非平坦旋转曲线，发现从非平坦旋转假设推导出的运动学距离（$-$ 5至$-$ 39 \kms ~lag）与视差距离一致。
英文摘要：
We report the results of the measurement of the trigonometric parallax of an H$_2$O maser source in \r22 with the VLBI Exploration of Radio Astrometry (VERA). The annual parallax was determined to be 0.314$\pm$0.070~mas, corresponding to a distance of 3.18$^{+0.90}_{-0.66}$~kpc. Our results confirm \r22 to be located in the Perseus arm. We computed the peculiar motion of \r22 to be $(U_{src}, V_{src}, W_{src}) = (4\pm4, -32\pm6, 8\pm6)$~\kms, where $U_{src}$, $V_{src}$, and $W_{src}$ are directed toward the Galactic center, in the direction of Galactic rotation and toward the Galactic north pole, respectively. \r22, NGC\,7538 and Cepheus A lie along the same line of sight, and are within 2$^{\circ}$ on the sky. Their parallax distances with which we derived their absolute position in the Milky Way show that \r22 and \ngc~are associated with the Perseus Arm, while \cepa~is located in the Local Arm. We compared the kinematic distances of \iras, \ga, \gb, \gc, \gd, \cepa, \ngc, \ge, \gf~and \r22~derived with flat and non-flat rotation curve with its parallax distance and found the kinematic distance derived from the non-flat rotation assumption ($-$5 to $-$39 \kms~lag) to be consistent with the parallax distance.
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