Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey
Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey
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DOI：
10.1093/mnras/sty701
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发表时间：
2018-03
影响因子：
4.8
通讯作者：
N. Cunningham;S. Lumsden;T. Moore;L. Maud;I. Mendigutía
中科院分区：
文献类型：
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作者：
N. Cunningham;S. Lumsden;T. Moore;L. Maud;I. Mendigutía
我们提出了一个流出和流入调查的结果，对距离有限的样本31个大规模的恒星形成区域从红色MSX源（RMS）的调查。根据SiO（8-7）的发射，确定了年轻的、活跃的外流的存在，并利用HCO + /H13 CO +（4-3）的发射，探讨了流入动力学。我们调查，如果流入和流出参数随源属性，探索是否有潜在的年轻活跃的流出区域显示出相似性或差异与地区窝藏更进化，可能是动量驱动，“化石”流出。在大约46%的排放源中检测到一氧化硅排放。当考虑源与和没有一个SiO检测（即潜在的活动和化石流出，分别），只有12 CO流出速度样本之间显示出显着的差异，表明SiO是更普遍的对源具有较高的流出速度。此外，我们发现SiO的亮度随着Herschel 70 μm与WISE 22 μm通量比的增加而增加，这表明SiO的产生在更年轻，更嵌入的区域中很普遍。同样，我们发现初步的证据表明，与SiO检测源有一个较小的热光度质量比，表明SiO（8-7）的排放与潜在的年轻地区。在我们的样本中，我们没有发现对显示下降签名的来源的流行。然而，更高能量的HCO +跃迁可能不是在这些区域中在该空间分辨率下最适合的下落示踪剂。© 2018作者（S）。由牛津大学出版社代表皇家天文学会出版。
We present the results of an outflow and infall survey towards a distance-limited sample of 31 massive st ar-forming regions drawn from the Red MSX source (RMS) survey. The presence of young, active outflows is identified from SiO (8-7) emission and the infall dynamics are explored using HCO + /H 13 CO + (4-3) emission. We investigate if the infall and outflow parameters vary with source properties, exploring whether regions hosting potentially young active outflows show similarities or differences with regions harbouring more evolved, possibly momentum-driven, 'fossil' outflows. SiO emission is detected towards approximately 46 per cent of the sources. When considering sources with and without an SiO detection (i.e. potentially active and fossil outflows, respectively), only the 12 CO outflow velocity shows a significant difference between samples, indicating SiO is more prevalent towards sources with higher outflow velocities. Furthermore, we find the SiO luminosity increases as a function of the Herschel 70 μm to WISE 22 μm flux ratio, suggesting the production of SiO is prevalent in younger, more embedded regions. Similarly, we find tentative evidence that sources with an SiO detection have a smaller bolometric luminosity-to-mass ratio, indicating SiO (8-7) emission is associated with potentially younger regions. We do not find a prevalence towards sources displaying signatures of infall in our sample. However, the higher energy HCO + transitions may not be the best suited tracer of infall at this spatial resolution in these regions. © 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.