A SCUBA survey of L1689 ¿ the dog that didn't bark
A SCUBA survey of L1689 ¿ the dog that didn't bark
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L1689 的水肺调查 ¿
DOI：
10.1111/j.1365-2966.2006.10249.x
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发表时间：
2006
影响因子：
4.8
通讯作者：
P. Andre'
中科院分区：
文献类型：
--
作者：
D. Nutter;D. Ward;P. Andre'
我们提供了蛇夫座ρ分子云复合体中L1689云的亚毫米数据。我们发现了一些无星和前恒星的核心和原恒星的信封。我们还首次在亚毫米连续谱中探测到一些相互平行的细丝，以及在邻近的L1688云中观察到的细丝。这些细丝也在L1689的13 CO观测中看到。这些细丝包含了云中所有的恒星形成活动。L1689位于研究充分的L1688云旁边，其中包含ρ Oph-A核心。L1688的恒星形成历史比L1689活跃得多，尽管它们在13 CO数据上有明显的相似性。因此，我们将L1689标记为不吠叫的狗。我们试图通过比较目前以致密物质形式存在的每个云的总质量来解释这种明显的异常，例如前恒星核。我们首先注意到L1688的质量比L1689大，但我们也发现，当归一化到每个云的总质量时，L1689云在致密核心中的质量百分比比L1688低得多。我们将此归因于Loren的假设，即蛇夫座ρ复合体中星星的形成受到附近的上天蝎座OB星协的外部影响的影响，并可能主要受σ Sco的影响。L1689距离σ Sco较远，因此活性较低。我们在L1689中观察到的细丝，似乎仍然是由σ Sco的影响造成的。
We present submillimetre data for the L1689 cloud in the ρ Ophiuchi molecular cloud complex. We detect a number of starless and pre-stellar cores and protostellar envelopes. We also detect a number of filaments for the first time in the submillimetre continuum that are parallel both to each other, and to filaments observed in the neighbouring L1688 cloud. These filaments are also seen in the 13 CO observations of L1689. The filaments contain all of the star-formation activity in the cloud. L1689 lies next to the well-studied L1688 cloud that contains the ρ Oph-A core. L1688 has a much more active star-formation history than L1689 despite their apparent similarity in 13 CO data. Hence, we label L1689 as the dog that didn’t bark. We endeavour to explain this apparent anomaly by comparing the total mass of each cloud that is currently in the form of dense material such as pre-stellar cores. We note firstly that L1688 is more massive than L1689, but we also find that when normalized to the total mass of each cloud, the L1689 cloud has a much lower percentage of mass in dense cores than L1688. We attribute this to the hypothesis of Loren that the star formation in the ρ Ophiuchi complex is being affected and probably dominated by the external influence of the nearby Upper Scorpius OB association and predominantly by σ Sco. L1689 is further from σ Sco and is therefore less active. The influence of σ Sco appears none the less to have created the filaments that we observe in L1689.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell