Dusty Cloud Acceleration with Multiband Radiation
Dusty Cloud Acceleration with Multiband Radiation
复制标题
多波段辐射尘云加速
DOI：
10.3847/1538-4357/ab811b
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发表时间：
2019
期刊：
影响因子：
--
通讯作者：
Dong Zhang
中科院分区：
文献类型：
--
作者：
Xiaoshan 珊 Huang 黄小;S. Davis;Dong Zhang
我们对冷而稠密的云进行二维和三维模拟，相对于热的、扩散的背景气体，尘埃上的辐射压力会加速这些云的速度。我们研究了紫外线 (UV) 和红外线 (IR) 辐射场加速的相对有效性，它们既独立又同时作用于同一云。我们研究对红外发射来说光学较薄但紫外光学深度不同的云。与之前的工作一致，当红外波段通量超过紫外通量时，我们发现相对有效的加速和较长的云生存时间。然而，当紫外线通量占主导地位，甚至只占红外辐射通量的一小部分（~5%–10%）时，它可以压缩云，首先压碎云，然后破坏外层。这促使含尘气体的外部区域与热扩散背景混合到大多数灰尘不可能存活或与气体结合的程度。因此，即使有效的红外冷却使大部分气体接近辐射平衡温度（T≲100K），冷云也无法存活足够长的时间尺度，从而在破坏之前经历显着的加速。我们讨论了对观测系统的影响，得出的结论是，当来自恒星形成区域的光被有效地重新处理成红外光时，辐射压力驱动是最有效的。
We perform two-dimensional and three-dimensional simulations of cold, dense clouds, which are accelerated by radiation pressure on dust relative to a hot, diffuse background gas. We examine the relative effectiveness of acceleration by ultraviolet (UV) and infrared (IR) radiation fields, both independently and acting simultaneously on the same cloud. We study clouds that are optically thin to IR emission but with varying UV optical depths. Consistent with previous work, we find relatively efficient acceleration and long cloud survival times when the IR band flux dominates over the UV flux. However, when the UV flux is dominant or even a modest percentage (∼5%–10%) of the IR irradiating flux, it can act to compress the cloud, first crushing it and then disrupting the outer layers. This drives mixing of the outer regions of the dusty gas with the hot diffuse background to the point where most dust is not likely to survive or stay coupled to the gas. Hence, the cold cloud is unable to survive for a long enough timescale to experience significant acceleration before disruption even though efficient IR cooling keeps the majority of the gas close to the radiative equilibrium temperature (T ≲ 100 K). We discuss the implications for observed systems, concluding that radiation pressure driving is most effective when the light from star-forming regions is efficiently reprocessed into the IR.
模拟大质量恒星的紫外线辐射反馈。
DOI：
10.3847/1538-4357/aabe27
发表时间：
2018
期刊：
The Astrophysical Journal
影响因子：
--
作者：
Kim, Jeong-Gyu;Kim, Woong-Tae;Ostriker, Eve C.
通讯作者：
Ostriker, Eve C.
早期宇宙中尘埃恒星形成星系的快速分子流出
影响因子：
56.9
作者：
Spilker, J. S.;Aravena, M.;Béthermin, M.;Chapman, S. C.;Chen, C.-C.;Cunningham, D. J.;De Breuck, C.;Dong, C.;Gonzalez, A. H.;Hayward, C. C.
通讯作者：
Hayward, C. C.
量化 ULIRGs (QUADROS) IV 中 AGN 驱动的流出：F14394 5332 中 sub-kpc 暖流出的 HST/STIS 光谱
影响因子：
4.8
作者：
Batcheldor D
通讯作者：
Batcheldor D