Deciphering the interstellar medium around the Scorpius-Centarus OB association

破译天蝎座-半人马座 OB 协会周围的星际介质

• 批准号: 203255650
• 负责人: Professor Dr. Thomas Preibisch
• 金额: --
• 依托单位: Arbeitsgruppe Nukleare Astrophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2011
• 资助国家: 德国
• 起止时间: 2010-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/203255650?language=en
• 关键词: Deciphering; interstellar; medium; around; Scorpius

We propose to study the complex structure and evolution of the interstellar medium (ISM) in the vicinity of the Scorpius-Centaurus OB association. As this is the nearest region of recent massive star formation, multi-wavelength observations can provide a unique opportunity to investigate in detail how the well known population of massive stars in Sco-Cen feeds the ISM with kinetic energy, ionizing radiation, and nucleosynthesis ejecta, and how this feedback created the observed systems of superbubbles surrounding the association and destroyed the parental molecular cloud. We will also test the scenario that this stellar feedback swept up new dense molecular clouds and triggered the formation of new generations of stars in these clouds. We will couple the MPE population synthesis code with hydrodynamical simulations in order to follow radioactive tracers, ejected from the massive stars as an independent signature of the evolution of the interstellar environment and the mixing of different gas phases. The theoretical predictions from the numerical simulations will be compared with the observational data to test the models.In the two years since the start of this project, we have collected numerous observations of the ScoCen complex across a wide range of wavelengths, from the radio to the gamma-ray regime, that we can now use to characterize the ISM in and around ScoCen.We use data from Planck, Herschel, and our new observations with the APEX sub-mm telescope to study the structure and the physical parameters of the cold dense clouds, in particular the Lupus I molecular cloud, that was probably created by the interaction of two colliding bubbles. We have been recently granted further time at the APEX telescope to observe the CO line emission in selected parts of the Lupus clouds; this will reveal the kinematics of the molecular gas in unprecedented resolution. In order to trace the warmer and more diffuse gas, we analyze new 21 cm HI radio data from the Parkes Galactic All Sky Survey, which provide very detailed information about the structure and kinematics of the expanding bubbles. Our analysis of the radioactivity gamma-rays as measured with INTEGRAL and the diffuse X-ray emission will trace the supernova- and wind-outputs of the massive stars. In the second funding period, we will combine all these data sets to obtain a comprehensive picture of the structure and dynamics of the ISM in Sco-Cen. Confronting the numerical simulations to these data should finally lead to a self-consistent model of the origin, evolution, and fate of the Sco-Cen complex.

我们建议研究天蝎座-人马座OB星群附近星际介质（ISM）的复杂结构和演化。由于这是最近的大质量星星形成的区域，多波长观测可以提供一个独特的机会，详细研究Sco-Cen中众所周知的大质量恒星群如何向ISM提供动能，电离辐射和核合成喷出物，以及这种反馈如何创造了观察到的围绕协会的超级气泡系统并摧毁了母体分子云。我们还将测试这种恒星反馈扫起新的致密分子云并引发这些云中新一代恒星形成的情况。我们将耦合的MPE人口合成代码与流体动力学模拟，以遵循放射性示踪剂，从大质量的恒星作为星际环境的演化和不同的气体相的混合的独立签名喷射。从数值模拟的理论预测将与观测数据进行比较，以测试模型。在这个项目开始以来的两年里，我们已经收集了大量的ScoCen复合体的观测数据，从无线电到伽马射线，我们现在可以用来描述ScoCen及其周围的ISM。我们使用普朗克，赫歇尔，以及我们用APEX亚毫米望远镜进行的新观测，以研究冷密云的结构和物理参数，特别是Lupus I分子云，它可能是由两个碰撞的气泡相互作用产生的。我们最近被授予更多的时间在APEX望远镜观察CO线发射在选定的部分狼疮云;这将揭示运动学的分子气体在前所未有的分辨率。为了跟踪更温暖，更弥漫的气体，我们分析了新的21厘米HI无线电数据从帕克斯银河系全天巡天，这提供了非常详细的信息膨胀气泡的结构和运动学。我们对用INTEGRAL测量的放射性伽马射线和漫射X射线发射的分析将追踪大质量恒星的超新星和风输出。在第二个资助期内，我们将联合收割机结合所有这些数据集，以全面了解Sco-Cen ISM的结构和动态。面对这些数据的数值模拟应该最终导致一个自洽的模型的起源，演化和命运的斯科-岑复杂。