Pilot Hi survey of Planck Galactic Cold Clumps with FAST

Pilot Hi survey of Planck Galactic Cold Clumps with FAST
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Pilot Hi 利用 FAST 对普朗克星系冷团块进行调查

DOI:
10.1088/1674-4527/20/5/77
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发表时间:
2019-12
影响因子:
1.8
通讯作者:
Liu Shu
Liu Shu
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Tang Ning-Yu;Zuo Pei;Li Di;Qian Lei;Liu Tie;Wu Yue-Fang;Krco Marko;Liu Meng-Ting;Yue You-Ling;Zhu Yan;Liu Hong-Fei;Yu Dong-Jun;Sun Jing-Hai;Jiang Peng;Pan Gao-Feng;Li Hui;Gan Heng-Qian;Yao Rui;Liu Shu

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本文介绍了利用500米口径球面射电望远镜(FAST)对17个普朗克银河系冷团(PGCC)进行的一次试验性Hi巡天。HI窄自吸收(HINSA)是探测冷HI与分子氢H2混合的一种有效方法,它有助于加深我们对星际介质中原子到分子跃迁的理解。HINSA阳性率为58%。HINSA的柱密度与~(13)CO的柱密度呈中等程度的相关性,其关系式为(N(HINSA))=(0.52 ± 0.26)(N ~(13)CO)+(10 ± 4.1)。Hi相对于总氢的丰度[Hi]/[H]的平均值为4.4 × 10-3,约为HINSA以往对分子云观测平均值的2.8倍。对于总氢柱密度NH > 5 × 1020 cm-2的云,HINSA丰度与总氢柱密度呈负相关,证实了大质量云分子气体形成过程中冷Hi气体的消耗。13 CO的非热谱线宽度比HINSA的宽约0-0.5 km s−1。HINSA的非热宽度较窄的一个可能解释是HINSA区小于13 CO区。根据宇宙线对H_2形成和分解的解析模型,我们计算出五个源的云年龄在106.7 - 107.0年之间。
We present a pilot Hi survey of 17 Planck Galactic Cold Clumps (PGCCs) with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Hi Narrow Self-Absorption (HINSA) is an effective method to detect cold Hi being mixed with molecular hydrogen H2 and improves our understanding of the atomic to molecular transition in the interstellar medium. HINSA was found in 58% PGCCs that we observed. The column density of HINSA was found to have an intermediate correlation with that of 13CO, following (N(HINSA)) = (0.52 ± 0.26) (N13CO) + (10 ± 4.1). Hi abundance relative to total hydrogen [Hi]/[H] has an average value of 4.4 × 10–3, which is about 2.8 times of the average value of previous HINSA surveys toward molecular clouds. For clouds with total column density NH > 5 × 1020 cm–2, an inverse correlation between HINSA abundance and total hydrogen column density is found, confirming the depletion of cold Hi gas during molecular gas formation in more massive clouds. Non-thermal line width of 13CO is about 0-0.5 km s−1 larger than that of HINSA. One possible explanation of narrower non-thermal width of HINSA is that HINSA region is smaller than that of 13CO. Based on an analytic model of H2 formation and H2 dissociation by cosmic ray, we found the cloud ages to be within 106.7 – 107.0 yr for five sources.
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