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首页> 外文期刊>The Astrophysical journal >MASER SPOT SHAPE PERSISTENCE: EVIDENCE FOR THE KINEMATIC INTERPRETATION OF PROPER MOTIONS
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MASER SPOT SHAPE PERSISTENCE: EVIDENCE FOR THE KINEMATIC INTERPRETATION OF PROPER MOTIONS

机译：整体斑点形状的持久性：运动正确运动解释的证据

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摘要

Intrinsic morphologies of interstellar OH maser-emitting gas condensations have been measured, for the first time, at two distinct epochs. The shapes and orientations of these maser condensations, in the vicinity of the ultracompact H II region W3(OH), are remarkably persistent from one epoch to the next despite significant position shifts. These observations provide the first direct evidence that the motions measured are due to actual physical movement of discrete clumps of maser-emitting matter, rather than to some sort of nonkinematic effect, such as traveling excitation phenomena or chance realignments of coherency paths through the masing gas. The kinematic assumption is crucial to astrophysical applications of maser proper-motion measurements, including distance determinations and studies of source dynamics. The shapes of the OH maser spots in W3(OH) show a tendency to be elongated in a direction parallel to the shock front delineated by radio continuum maps of the H II region, supporting the picture in which masers are formed in compressed gas behind the shock front.
机译：首次在两个不同的时期测量了星际OH maser发射气体凝结的本征形态。尽管位置发生了明显变化，但在超紧凑H II区W3（OH）附近，这些maser缩合的形状和方向仍显着持久。这些观察结果提供了第一个直接证据，表明所测量的运动是由于离散的成团的maser发射物质的实际物理运动引起的，而不是由于某种非运动学效应引起的，例如行进的激发现象或穿过主气体的相干路径的偶然重新排列。运动学假设对于maser正常运动测量的天体物理应用至关重要，包括距离确定和源动态研究。 W3（OH）中的OH maser点的形状显示出在平行于激波前沿的方向上被拉长的趋势，该方向由H II区域的无线电连续谱图所描绘，支持了在其中的压缩气体中形成masers的图像。震荡前线。

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