Observational Evidence of the Merging of Filaments and Hub Formation in G083.097+03.270

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Alik Panja, Lokesh K. Dewangan, Tapas Baug, Wen Ping Chen, Yan Sun, Tirthendu Sinha, Soumen Mondal
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Abstract

Abstract We uncover a hub–filament system correlated with massive young stellar associations in G083.097+03.270. Diagnosed with simultaneous 12 CO, 13 CO, and C 18 O line observations, the region is found to host two distinct and elongated filaments having separate velocity components, interacting spatially and kinematically, that appear to have seeded the formation of a dense hub at the intersection. A large velocity spread at the hub, in addition to a clear bridging feature connecting the filaments in velocity, indicate the merging of filaments. Along the filament axis, the velocity gradient reveals a global gas motion with an increasing velocity dispersion inward to the hub signifying turbulence. Altogether, the clustering of Class I sources, a high excitation temperature, a high column density, and the presence of a massive outflow at the central hub suggest enhanced star formation. We propose that the merging of large-scale filaments and velocity gradients along filaments are the driving factors in the mass accumulation process at the hub that have sequentially led to the massive star formation. With two giant filaments merging to coincide with a hub therein with ongoing star formation, this site serves as a benchmark for the “filaments to clusters” star-forming paradigm.
G083.097+03.270中细丝合并和轮毂形成的观测证据
我们发现了一个与G083.097+03.270大质量年轻恒星相关的中心-灯丝系统。通过同时进行的12co, 13co和c18o线观测,发现该区域拥有两个不同的细长细丝,它们具有独立的速度分量,在空间和运动上相互作用,似乎在交集处播下了密集轮毂形成的种子。在轮毂处的大速度分布,以及在速度上连接细丝的明显桥接特征,表明细丝的合并。沿着细丝轴,速度梯度显示了一个整体的气体运动,速度向内弥散增加,表明湍流。总之,I类源的聚集,高激发温度,高柱密度,以及中心中心大量流出物的存在表明恒星形成增强。我们认为大尺度细丝的合并和沿细丝的速度梯度是中心质量积累过程的驱动因素,从而导致了大质量恒星的形成。两个巨大的细丝与一个正在形成的恒星中心合并在一起,这个地点作为“细丝到星团”恒星形成范例的基准。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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