蛇夫座和狼疮云复合体的依巴谷距离
Hipparcos distances of Ophiuchus and Lupus cloud complexes
摘要：
我们将两微米全天巡天（2 MASS）的灭绝图与依巴谷和第谷的彗星相结合，以获得对蛇夫座和狼疮黑暗复合体距离的可靠和高精度的估计。我们的分析，基于严格的最大似然方法，表明rho-Ophiuchi云位于（119 +/- 6）pc，狼疮复合体位于（155 +/- 8）pc;此外，我们能够对云的厚度及其在天空中的方向进行限制（这两种影响都不包括在上面引用的误差估计中）。对于蛇夫座来说，我们发现了一些证据，表明流光比核心更接近我们。本文中应用的方法目前仅限于附近的分子云，但它将在GAIA时代找到许多自然应用，届时将有可能确定银河系中几乎所有分子云的距离和三维结构。
英文摘要：
We combine extinction maps from the Two Micron All Sky Survey (2MASS) with Hipparcos and Tycho parallaxes to obtain reliable and high-precision estimates of the distance to the Ophiuchus and Lupus dark complexes. Our analysis, based on a rigorous maximum-likelihood approach, shows that the rho-Ophiuchi cloud is located at (119 +/- 6) pc and the Lupus complex is located at (155 +/- 8) pc; in addition, we are able to put constraints on the thickness of the clouds and on their orientation on the sky (both these effects are not included in the error estimate quoted above). For Ophiuchus, we find some evidence that the streamers are closer to us than the core. The method applied in this paper is currently limited to nearby molecular clouds, but it will find many natural applications in the GAIA-era, when it will be possible to pin down the distance and three-dimensional structure of virtually every molecular cloud in the Galaxy.
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