ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules
ALMA Observations of the IRDC Clump G34.43+00.24 MM3: Complex Organic and Deuterated Molecules
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DOI：
10.3847/1538-4357/aaadfd
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发表时间：
2018-03
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影响因子：
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通讯作者：
T. Sakai;T. Yanagida;K. Furuya;Y. Aikawa;P. Sanhueza;N. Sakai;T. Hirota;J. Jackson;S. Yamamoto
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作者：
T. Sakai;T. Yanagida;K. Furuya;Y. Aikawa;P. Sanhueza;N. Sakai;T. Hirota;J. Jackson;S. Yamamoto
我们利用阿塔卡马大型毫米/亚毫米阵列观测到了与红外黑云团G34.43+00.24 MM3相关的热核/科里奥（HC）的复杂有机分子（COMs）和氘化物质。我们在G34.43+00.24 MM3 HC中检测到6种正常com (CH3OH, CH3CHO, CH3CH2CN, CH3OCH3， HCOOCH3和NH2CHO)， 1种氘化com （CH2DCN）和2种氘化基本分子（D2CO和DNC）。在我们的数据中，除了CH3OH外，这些谱线都没有在激波区域被检测到，这表明COMs不是起源于激波。在G34.43+00.24 MM3 HC中，COMs相对于CH3OH的丰度与高质量热核相似，而与低质量恒星形成区的热核相似。这一结果表明，G34.43+00.24 MM3 HC的预热阶段的物理条件与高质量源相似。另一方面，G34.43+00.24 MM3 HC中D2CO相对于CH3OH的丰度高于其他热岩芯，似乎与热岩芯相当。G34.43+00.24 MM3 HC相对较高的D2CO/CH3OH比值表明G34.43+00.24 MM3 HC存在较长的冷无星阶段。
We have observed complex organic molecules (COMs) and deuterated species toward a hot core/corino (HC) associated with the infrared dark cloud clump G34.43+00.24 MM3 with the Atacama Large Millimeter/submillimeter Array. We have detected six normal-COMs (CH3OH, CH3CHO, CH3CH2CN, CH3OCH3, HCOOCH3, and NH2CHO), one deuterated-COM (CH2DCN), and two deuterated fundamental molecules (D2CO and DNC) toward G34.43+00.24 MM3 HC. None of these lines, except for CH3OH, are detected toward the shocked regions in our data, which suggests that COMs do not originate in shocks. The abundance of the COMs relative to CH3OH in G34.43+00.24 MM3 HC is found to be similar to those in high-mass hot cores, rather than those in hot corinos in low-mass star-forming regions. This result suggests that the physical conditions of the warm-up phase of G34.43+00.24 MM3 HC are similar to those of high-mass sources. On the other hand, the D2CO abundance relative to CH3OH in G34.43+00.24 MM3 HC is higher than that of other hot cores, and seems to be comparable to that of hot corinos. The relatively high D2CO/CH3OH ratio of G34.43+00.24 MM3 HC implies a long cold starless phase of G34.43+00.24 MM3 HC.