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arXiv 0908.2037astro-ph.GA
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银河系中心区域的星际磁场

Interstellar magnetic fields in the Galactic center region

Katia Ferriere

摘要:

我们试图获得银河系中心区域星际磁场尽可能清晰和完整的图像。为此,我们回顾了过去25年来在银河系中心~ 200 pc范围内建立的星际磁场的观测知识。然后,我们批判性地讨论了各种理论解释和方案,以解释现有的观察。我们还研究了它与一般银河系磁场的可能联系,并描述了外星系的观测情况。我们提出一个银河系中心附近磁场的连贯图像,它调和了一些看似不同的观点,最好地解释了大量的观测结果。我们的主要结论如下。在弥漫的云间介质中,大尺度磁场近似为极向磁场,其值一般接近于与宇宙射线均分(~ 10 microG),但在局部丝状体中,磁场强度可达~ 1 mG。在稠密的星际云中,磁场近似水平,其值通常约为1 mG。

英文摘要:

We seek to obtain a picture of the interstellar magnetic field in the Galactic center region that is as clear and complete as possible. To that end, we review the observational knowledge that has built up over the past 25 years on interstellar magnetic fields within ~ 200 pc of the Galactic center. We then critically discuss the various theoretical interpretations and scenarios proposed to explain the existing observations. We also study the possible connections with the general Galactic magnetic field and describe the observational situation in external galaxies. We propose a coherent picture of the magnetic field near the Galactic center, which reconciles some of the seemingly divergent views and which best accounts for the vast body of observations. Our main conclusions are the following. In the diffuse intercloud medium, the large-scale magnetic field is approximately poloidal and its value is generally close to equipartition with cosmic rays (~ 10 microG), except in localized filaments where the field strength can reach ~ 1 mG. In dense interstellar clouds, the magnetic field is approximately horizontal and its value is typically ~ 1 mG.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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