Tracing Evolution in Massive Protostellar Objects - I. Fragmentation and emission properties of massive star-forming clumps in a luminosity-limited ALMA sample
Tracing Evolution in Massive Protostellar Objects - I. Fragmentation and emission properties of massive star-forming clumps in a luminosity-limited ALMA sample
复制标题
追踪大质量原恒星天体的演化 - I. 光度有限的 ALMA 样本中大质量恒星形成团块的碎片和发射特性
DOI：
10.1093/mnras/stad2824
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发表时间：
2023
影响因子：
4.8
通讯作者：
Avison A
中科院分区：
文献类型：
--
作者：
Avison A
大质量（≥ 8）恒星在确定其宿主星系中星际介质的能量收支和化学富集方面的作用是重要的。本文介绍了利用阿尔马在1.3 mm波段观测到的38个大质量恒星形成区的色-光选择（L ~*= 3 × 103 ~ 1 × 105 L ~*）样品，并探讨了样品的碎裂、成团和通量密度特性。发现克里思样本字段各自包含多个片段（每个字段在2到15个之间）。通量密度预算在以单个高通量密度碎片为主的发射场和以较暗物体的合并通量密度为主的发射场之间平均分配（53%-47%）。在大多数领域中观察到的碎裂尺度与热金斯长度λJ不可比较，在大多数情况下，λJ较大，表明存在一些非热机制。一个试探性的演变趋势之间的光度的集群和“谱线丰富”的克里思字段，与6.7 GHz脉泽相关领域被发现是较低的光度和更多的线丰富。这项工作还描述了一种方法，线内无连续通道选择阿尔马数据和一个通用的方法来区分来源，这些潜在的恒星形成的那些没有，利用干涉可见度属性。
The role of massive (≥ 8) stars in defining the energy budget and chemical enrichment of the interstellar medium in their host galaxy is significant. In this first paper from theTracing Evolution in Massive Protostellar Objects(TEMPO) project we introduce a colour-luminosity selected (L*∼ 3 × 103to 1 × 105L⊙) sample of 38 massive star-forming regions observed with ALMA at 1.3 mm and explore the fragmentation, clustering, and flux density properties of the sample. The TEMPO sample fields are each found to contain multiple fragments (between 2 and 15 per field). The flux density budget is split evenly (53 per cent–47 per cent) between fields where emission is dominated by a single high flux density fragment and those in which the combined flux density of fainter objects dominates. The fragmentation scales observed in most fields are not comparable with the thermal Jeans length, λJ, being larger in the majority of cases, suggestive of some non-thermal mechanism. A tentative evolutionary trend is seen between luminosity of the clump and the ‘spectral line richness’ of the TEMPO fields; with 6.7 GHz maser associated fields found to be lower luminosity and more line rich. This work also describes a method of line-free continuum channel selection within ALMA data and a generalized approach used to distinguishing sources which are potentially star-forming from those which are not, utilizing interferometric visibility properties.