Filament intersections and cold dense cores in Orion A North
Author
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Zhang, Chao
Author
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Ren, Zhiyuan
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Wu, Jingwen
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Li, Di
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Zhu, Lei
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Zhang, Qizhou
Author
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Mardones Pérez, Diego
Author
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Wang, Chen
Author
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Shi, Hui
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Yue, Nannan
Author
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Luo, Gan
Author
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Xie, Jinjin
Author
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Jiao, Sihan
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Liu, Shu
Author
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Xu, Xuefang
Author
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Wang, Shen
Admission date
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2021-03-01T18:23:42Z
Available date
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2021-03-01T18:23:42Z
Publication date
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2020
Cita de ítem
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MNRAS 497, 793–808 (2020)
es_ES
Identifier
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10.1093/mnras/staa1958
Identifier
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https://repositorio.uchile.cl/handle/2250/178485
Abstract
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We studied the filament structures and cold dense cores in OMC-2,3 region in Orion A North molecular cloud using the high-resolution N2H+ (1-0) spectral cube observed with the Atacama Large Millimeter/Submillimeter Array (ALMA). The filament network over a total length of 2 pc is found to contain 170 intersections and 128 candidate dense cores. The dense cores are all displaced from the infrared point sources (possible young stars), and the major fraction of cores (103) are located around the intersections. Towards the intersections, there is also an increasing trend for the total column density N-tot as well as the power-law index of the column-density Probability Distribution Function (N-PDF), suggesting that the intersections would in general have more significant gas assembly than the other part of the filament paths. The virial analysis shows that the dense cores mostly have virial mass ratio of alpha(vir) = M-vir/M-gas < 1.0, suggesting them to be bounded by the self-gravity. In the mean time, only about 23 per cent of the cores have critical mass ratio of alpha(cri)t = M-crit/M-gas < 1.0, suggesting them to be unstable against core collapse. Combining these results, it shows that the major fraction of the cold starless and possible pre-stellar cores in OMC-2,3 are being assembled around the intersections, and currently in a gravitationally bound state. But more extensive core-collapse and star formation may still require continuous core mass growth or other perturbations.
es_ES
Patrocinador
dc.description.sponsorship
National Natural Science Foundation of China (NSFC)
11988101
11725313
11403041
11373038
11373045
U1931117
CAS International Partnership Program
114A11KYSB20160008
Chinese Academy of Sciences