NGC 6334I-MM1 吸积爆发十年后：对其环境的影响
Ten years since the NGC 6334I-MM1 accretion outburst: the impact on its environment
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中文总结 AI 辅助
该研究回顾了 NGC 6334I-MM1 吸积爆发十年后对环境的持续影响，发现脉泽耀发仍存，并估算了膨胀速度与磁场变化，揭示了团块结构和准周期性现象。
中文摘要 AI 辅助
十年过去了，与 NGC 6334I-MM1 相关的脉泽仍在持续耀发。甲醇和羟基脉泽已接近静止值，但水脉泽特征仍处于较高水平。我们识别并展示了更多 1.665 GHz 羟基脉泽，特别是在 NGC 6334I-MM1 吸积事件期间耀发的那些。一些羟基脉泽似乎在 2015 年事件之前就已活跃。我们讨论了可能的解释。吸积事件期间的红外径向膨胀速度估计约为 1.8 天文单位/天。然而，沿南北外流的膨胀速度约快十倍（约 18 天文单位/天）。脉泽耀发活动照亮了 NGC 6334I-MM1 中的团块结构。在 2015 年吸积事件之后，在 12.2 GHz 甲醇总积分发射中报告了准周期性，主要出现在速度区间 $v_{12.2}=[-12.0,-9.9]$ km/s。尚不确定这些周期性脉泽是否位于 NGC 6334I-MM1、MM2 或 MM3 中。通过两条基态羟基谱线的塞曼分裂测量的磁场，在耀发前后发生了变化。
英文摘要
Ten years on, flaring continues in masers associated with NGC 6334I-MM1. Methanol and hydroxyl masers are nearing quiescent values, but water features remain elevated. Several more 1.665 GHz hydroxyl masers, notably, that flared during the accretion event in NGC 6334I-MM1, are identified and presented. Some hydroxyl masers appear to have been active prior to the 2015 event. Possible explanations are discussed. The radial infrared expansion speed during the accretion event is estimated to be ~1.8 AU/d. However, the expansion speed along the North-South outflow is about ten times faster (~18 AU/d). The maser flaring activity illuminated clumpy structure in NGC 6334I-MM1. Quasi-periodicity is reported after the 2015 accretion event in the total integrated 12.2 GHz methanol emission, predominantly in $v_{12.2}=[-12.0,-9.9]$ \kms, after the accretion event in NGC 6334I-MM1. It is not certain if the periodic masers are located in NGC 6334I-MM1, -MM2, or -MM3. The magnetic field, measured from the Zeeman splitting of two ground state hydroxyl lines, undergoes changes before and after the flare.
发表机构
- State Key Laboratory of Radio Astronomy and Technology, Xinjiang Astronomical Observatory, CAS（中国科学院新疆天文台射电天文与技术国家重点实验室）
- University of Chinese Academy of Sciences（中国科学院大学）
- The Open University of Tanzania（坦桑尼亚开放大学）
- Hartebeesthoek Radio Astronomy Observatory（哈特比斯霍克射电天文台）
- Istituto Nazionale di Astrofisica Osservatorio Astronomico di Capodimonte Napoli（意大利国家天体物理学院卡波迪蒙特那不勒斯天文台）
- Netherlands Institute for Radio Astronomy, ASTRON（荷兰射电天文研究所ASTRON）
- UNISA Centre for Astrophysics and Space Sciences (UCASS), College of Science, Engineering and TechnologyUniversity of South Africa（南非大学宇宙学与空间科学中心（UCASS）科学与工程学院）
机构由 AI 辅助整理，请以论文原文为准。
