Detection of C6H– toward the Low-Mass Protostar IRAS 04368+2557 in L1527
Detection of C6H– toward the Low-Mass Protostar IRAS 04368+2557 in L1527
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DOI：
10.1086/533463
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发表时间：
2007-09
期刊：
影响因子：
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通讯作者：
N. Sakai;T. Sakai;Y. Osamura;S. Yamamoto
中科院分区：
文献类型：
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作者：
N. Sakai;T. Sakai;Y. Osamura;S. Yamamoto
我们已经探测到朝向L1527低质量恒星形成区域的C6H-的J = 7- 6,8 -7和15-14谱线。我们还在L1527中检测到相应的中性种C6H的J = 15/2-13/2和33/2-31/2系，以及C6H2的81,8-71,7系。这是首次在恒星形成区域探测到这三种物质。C6H-的柱密度为（5.8±1.8）× 1010 cm-2，与TMC-1相当，但L1527中C6H的柱密度约为TMC-1的1/5。因此，N(C6H-)/N（C6H）比值为0.093±0.029，比TMC-1高4倍。用简化的化学模型讨论了这种高阴离子与中性离子的比率。
We have detected the J = 7-6, 8-7, and 15-14 lines of C6H- toward a low-mass star-forming region of L1527. We have also detected the J = 15/2-13/2 and 33/2-31/2 lines of the corresponding neutral species, C6H, and the 81,8-71,7 line of C6H2 in L1527. This is the first detection of these three species in star-forming regions. The column density of C6H- is (5.8 ± 1.8) × 1010 cm-2, which is comparable to that in TMC-1, although the column density of C6H in L1527 is about 1/5 of that in TMC-1. Hence, the N(C6H-)/N(C6H) ratio is 0.093 ± 0.029, which is higher than that in TMC-1 by a factor of 4. This high anion-to-neutral ratio is discussed in terms of a simplified chemical model.