We present deep 1.4–4.8 μm JWST-NIRCam imaging of the Serpens Main star-forming region and identify 20 candidate protostellar outflows, most with bipolar structure and identified driving sources. The outflow position angles (PAs) are strongly correlated, and they are aligned within ±24° of the major axis of the Serpens filament. These orientations are further aligned with the angular momentum vectors of the two disk shadows in this region. We estimate that the probability of this number of young stars being coaligned if sampled from a uniform PA distribution is 10⁻⁴. This in turn suggests that the aligned protostars, which seem to be at similar evolutionary stages based on their outflow dynamics, formed at similar times with a similar spin inherited from a local cloud filament. Further, there is tentative evidence for a systematic change in average PA between the northwestern and southeastern cluster, as well as increased scatter in the PAs of the southeastern protostars. SOFIA-HAWC+ archival dust polarization observations of Serpens Main at 154 and 214 μm are perpendicular to the dominant jet orientation in the northwestern region in particular. We measure and locate shock knots and edges for all of the outflows and provide an identifying catalog. We suggest that Serpens main is a cluster that formed from an isolated filament and due to its youth retains its primordial outflow alignment.

中文翻译：

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为什么（几乎）所有原恒星流出物都在巨蛇主体内对齐？


我们展示了巨蛇主恒星形成区域的深部 1.4–4.8 μm JWST-NIRCam 成像，并确定了 20 个候选原恒星流出物，其中大多数具有双极结构并已确定驱动源。流出位置角 (PA) 密切相关，并且它们在蛇丝长轴的 ±24° 范围内对齐。这些方向进一步与该区域中两个圆盘阴影的角动量矢量对齐。我们估计，如果从均匀的 PA 分布中采样，这些年轻恒星排列在一起的概率为 10 ^-4 。这反过来表明，排列整齐的原恒星，根据它们的流出动力学，似乎处于相似的进化阶段，形成于相似的时间，具有从本地云丝继承的相似的自旋。此外，有初步证据表明，西北星团和东南星团之间的平均 PA 发生了系统性变化，并且东南原恒星的 PA 分散性增加。 SOFIA-HAWC+ 档案中的 Serpens Main 154 和 214 μm 尘埃偏振观测结果特别垂直于西北地区的主要喷流方向。我们测量并定位所有流出物的冲击结和边缘，并提供识别目录。我们认为蛇主体是由一根孤立的细丝形成的簇，并且由于其年轻而保留了其原始的流出排列。