OUTFLOWS AND BUBBLES IN TAURUS: STAR-FORMATION FEEDBACK SUFFICIENT TO MAINTAIN TURBULENCE
OUTFLOWS AND BUBBLES IN TAURUS: STAR-FORMATION FEEDBACK SUFFICIENT TO MAINTAIN TURBULENCE
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DOI：
10.1088/0067-0049/219/2/20
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发表时间：
2015-07
期刊：
影响因子：
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通讯作者：
Huixian Li;Di Li;L. Qian;Duo Xu;P. Goldsmith;A. Noriega-Crespo;Yue-fang Wu;Yushou Song;R. Nan
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文献类型：
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作者：
Huixian Li;Di Li;L. Qian;Duo Xu;P. Goldsmith;A. Noriega-Crespo;Yue-fang Wu;Yushou Song;R. Nan
我们根据 ~100 deg2 五所大学射电天文台 12CO(1-0) 和 13CO(1-0) 图以及斯皮策年轻恒星星表确定了金牛座分子云中的流出物和气泡。在金牛座主要的 44°2 区域，我们发现了 55 个流出物，其中 31 个是以前未知的。我们还在金牛座整个 100 deg2 区域发现了 37 个气泡，这是以前从未发现过的。所确定的流出物的总动能估计为∼ 3.9 × 10 45 ?> erg，这是云湍流能量的1%。检测到的气泡的总动能估计为 ∼ 9.2 × 10 46 ?> erg，这是金牛座湍流能量的 29%。流出的能量注入率为∼ 1.3 × 10 33 erg s − 1 ?> ，是云湍流耗散率的0.4-2倍。气泡的能量注入率为∼ 6.4 × 10 33 ?> erg s−1，是云的湍流耗散率的2-10倍。云的引力结合能约为 1.5 × 10 48 ?> erg，即分别是流出物和气泡能量的 385 倍和 16 倍。我们的结论是，流出物和气泡都无法提供足够的能量来平衡金牛座的整体引力结合能和湍流能。然而，在当前时代，恒星反馈足以维持金牛座观测到的湍流。
We have identified outflows and bubbles in the Taurus molecular cloud based on the ∼100 deg2 Five College Radio Astronomy Observatory 12CO(1-0) and 13CO(1-0) maps and the Spitzer young stellar object catalogs. In the main 44 deg2 area of Taurus, we found 55 outflows, of which 31 were previously unknown. We also found 37 bubbles in the entire 100 deg2 area of Taurus, none of which had been found previously. The total kinetic energy of the identified outflows is estimated to be ∼ 3.9 × 10 45 ?> erg, which is 1% of the cloud turbulent energy. The total kinetic energy of the detected bubbles is estimated to be ∼ 9.2 × 10 46 ?> erg, which is 29% of the turbulent energy of Taurus. The energy injection rate from the outflows is ∼ 1.3 × 10 33 erg s − 1 ?> , which is 0.4–2 times the dissipation rate of the cloud turbulence. The energy injection rate from bubbles is ∼ 6.4 × 10 33 ?> erg s−1, which is 2–10 times the turbulent dissipation rate of the cloud. The gravitational binding energy of the cloud is ∼ 1.5 × 10 48 ?> erg, that is, 385 and 16 times the energy of outflows and bubbles, respectively. We conclude that neither outflows nor bubbles can provide sufficient energy to balance the overall gravitational binding energy and the turbulent energy of Taurus. However, in the current epoch, stellar feedback is sufficient to maintain the observed turbulence in Taurus.