Striations, wisps and arcs - the fascinating evolution of filaments in a violent environment
条纹、缕缕和弧线——暴力环境下细丝的迷人演变
基本信息
- 批准号:263084359
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Priority Programmes
- 财政年份:2014
- 资助国家:德国
- 起止时间:2013-12-31 至 2017-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The multi-phase interstellar medium (ISM) consists of a complex network of dense and cold filamentary structures that are embedded in a diffuse, hotter medium. The filaments are believed to form by compressional, converging flows as a result of interstellar turbulence, by large scale spiral arms or by gravitational disk instabilities. It is generally believed that they are destroyed as soon as they condense into stars which disperse their environment by their ionizing radiation and stellar winds. Up until now, filaments have often been treated as isolated, homogeneous structures. However, recent observations indicate that filaments are much more complex than assumed so far. Irregular internal velocity fields have been detected indicating that filaments are actually bundles of narrow, interacting strings. In addition, new recent observations show that filaments are often embedded in large-scale gas flows that strongly affect their evolution. These flows result from nearby star-forming regions that generate violent outflows, ejecting low-density warm and hot gas into the galactic environment. We propose to investigate the interaction of dense gas filaments with surrounding winds, generated by nearby star-forming regions. We want to explore how the internal density field and turbulent velocity structure of a filament is affected by its interaction with the wind that leads to hydrodynamical instabilities (e.g. Kelvin-Helmholtz) in the interaction zone and drives density waves into the inner filamentary region. These interactions may explain the complex velocity structure observed. In addition, it can trigger star formation but also could destroy segments of a filament prior to star formation by mixing cold and dense filamentary gas with the diffuse, hotter wind material. As an excellent test case, we will focus on the fascinating substructures detected recently in the filament Barnard 44 (Ophiuchus) by Alves et al. Our results will provide important information on the evolution of filaments that are the fundamental building blocks of molecular clouds, especially on their intimate coupling with their turbulent and violent surrounding.
多相星际介质(ISM)是由一个复杂的网络密集和冷的对流结构,嵌入在一个弥漫的,更热的介质。这些细丝被认为是由星际湍流、大尺度螺旋臂或引力盘不稳定性导致的压缩、会聚流形成的。一般认为,它们一旦凝聚成恒星,就会被电离辐射和恒星风驱散周围的环境。到目前为止,长丝通常被视为孤立的,均匀的结构。然而,最近的观测表明,细丝比迄今为止所假设的要复杂得多。不规则的内部速度场已经被探测到,这表明细丝实际上是一束束狭窄的相互作用的弦。此外,最近的新观察表明,细丝通常嵌入大规模气流中,强烈影响其演变。这些流动来自附近的恒星形成区域,这些区域产生剧烈的外流,将低密度的温暖和高温气体喷射到银河系环境中。我们建议调查致密气体细丝与周围的风,附近的恒星形成区产生的相互作用。我们要探讨内部密度场和湍流速度结构的细丝是如何影响其与风的相互作用,导致流体动力学的不稳定性(如开尔文-亥姆霍兹)的相互作用区和驱动器的密度波到内部的对流区域。这些相互作用可以解释观察到的复杂速度结构。此外,它可以触发星星的形成,但也可以在星星形成之前通过将冷而稠密的惰性气体与扩散的较热的风物质混合来破坏灯丝的片段。 作为一个很好的测试案例,我们将专注于最近在细丝巴纳德44(蛇夫座)阿尔维斯等人检测到的迷人的子结构。我们的研究结果将提供重要的信息,细丝的演变是分子云的基本组成部分,特别是对他们的紧密耦合与他们的湍流和暴力的周围。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
数据更新时间:{{ journalArticles.updateTime }}
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Professor Dr. Andreas Burkert其他文献
Professor Dr. Andreas Burkert的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Professor Dr. Andreas Burkert', 18)}}的其他基金
Feeding and Feedback in the Nucleus of our Galaxy
银河系核心的供给和反馈
- 批准号:
328058720 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Research Grants
The physics of the interstellar medium under extreme conditions in Seyfert galaxies
塞弗特星系极端条件下星际介质的物理特性
- 批准号:
205979928 - 财政年份:2011
- 资助金额:
-- - 项目类别:
Priority Programmes
The Structure and Formation of Elliptical Galaxies
椭圆星系的结构和形成
- 批准号:
5449802 - 财政年份:2005
- 资助金额:
-- - 项目类别:
Priority Programmes
Induzierte Sternentstehung in turbulenten Molekülwolken
湍流分子云中诱导恒星形成
- 批准号:
5193108 - 财政年份:1999
- 资助金额:
-- - 项目类别:
Priority Programmes
Fragmentation und Sternentstehung in gravitativ instabilen Molekülwolken
引力不稳定分子云中的碎片和恒星形成
- 批准号:
5234950 - 财政年份:1995
- 资助金额:
-- - 项目类别:
Priority Programmes
相似海外基金
How the Milky Way ticks: comprehending complexity in the interstellar medium, from ethereal wisps to dense structures at the onset of star formation
银河系如何运行:理解星际介质的复杂性,从空灵的缕缕到恒星形成开始时的致密结构
- 批准号:
6843-2013 - 财政年份:2017
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
How the Milky Way ticks: comprehending complexity in the interstellar medium, from ethereal wisps to dense structures at the onset of star formation
银河系如何运行:理解星际介质的复杂性,从空灵的缕缕到恒星形成开始时的致密结构
- 批准号:
6843-2013 - 财政年份:2016
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
How the Milky Way ticks: comprehending complexity in the interstellar medium, from ethereal wisps to dense structures at the onset of star formation
银河系如何运行:理解星际介质的复杂性,从空灵的缕缕到恒星形成开始时的致密结构
- 批准号:
6843-2013 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
How the Milky Way ticks: comprehending complexity in the interstellar medium, from ethereal wisps to dense structures at the onset of star formation
银河系如何运行:理解星际介质的复杂性,从空灵的缕缕到恒星形成开始时的致密结构
- 批准号:
6843-2013 - 财政年份:2014
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual
How the Milky Way ticks: comprehending complexity in the interstellar medium, from ethereal wisps to dense structures at the onset of star formation
银河系如何运行:理解星际介质的复杂性,从空灵的缕缕到恒星形成开始时的致密结构
- 批准号:
6843-2013 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Discovery Grants Program - Individual