The giant molecular cloud associated with RCW 106: A 1.2 mm continuum mapping study
The giant molecular cloud associated with RCW 106: A 1.2 mm continuum mapping study
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DOI：
10.1051/0004-6361:20040365
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发表时间：
2004-06
影响因子：
6.5
通讯作者：
B. Mookerjea;C. Kramer;M. A. Nyman;Kosma;U. Koeln;H Germany;Airub;Bochum;Sest;Eső;ChileOSO;Onasala;Sweden.
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文献类型：
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作者：
B. Mookerjea;C. Kramer;M. A. Nyman;Kosma;U. Koeln;H Germany;Airub;Bochum;Sest;Eső;ChileOSO;Onasala;Sweden.
我们使用 SEST 上的 SIMBA 绘制了覆盖 28 pc × 94 pc 区域的分子云的尘埃连续发射图，该区域与著名的 H 区域 RCW 106 在 1.2 mm 处相关。 HPBW 为 24 �� (0.4 pc) 的观察结果揭示了 95 个团块，其中约 50% 具有 MSX 关联，只有 20% 具有 IRAS 关联。由于它们对较冷的粉尘具有更高的敏感性和更高的角分辨率，目前的观测结果确定了新的排放特征，并且还表明该地区的大多数 IRAS 源由多个粉尘排放峰组成。检测到的毫米源 (MMS) 一端包括奇异的 MMS5（与 IRAS 16183-4958 相关，是我们银河系中最亮的红外源之一），另一端是明亮（可能是冷）源 MMS54，而另一端没有 IRAS 或 MSX 关联。大约 10% 的来源与高质量恒星形成活动的路标有关。假设均匀的尘埃温度为 20 K，我们估计与 RCW 106 相关的 GMC 总质量为 ∼10 5 M�。组成的毫米团块的质量和半径范围为 40 至 10 4 和 0.3 至 1.9 pc。团块的密度范围在(0.5-6)×10 4 cm -3 之间。我们分别使用两个独立的结构分析工具 gaussclumps 和 clumpfind 将连续发射分解为高斯和任意形状的团块。发现团块质谱的指数 α 为 1.6 ± 0.3，与所使用的分解算法无关。这里涉及的质量和长度尺度的质谱指数与大规模 CO 观测得出的结果一致。
We have mapped the dust continuum emission from the molecular cloud covering a region of 28 pc × 94 pc associated with the well-known H region RCW 106 at 1.2 mm using SIMBA on SEST. The observations, having an HPBW of 24 �� (0.4 pc), reveal 95 clumps, of which about 50% have MSX associations and only 20% have IRAS associations. Owing to their higher sensitivity to colder dust and higher angular resolution the present observations identify new emission features and also show that most of the IRAS sources in this region consist of multiple dust emission peaks. The detected millimeter sources (MMS) include on one end the exotic MMS5 (associated with IRAS 16183-4958, one of the brightest infrared sources in our Galaxy) and the bright (and presumably cold) source MMS54, with no IRAS or MSX associations on the other end. Around 10% of the sources are associated with signposts of high mass star formation activity. Assuming a uniform dust temperature of 20 K we estimate the total mass of the GMC associated with RCW 106 to be ∼10 5 M� . The constituent millimeter clumps cover a range of masses and radii between 40 to 10 4 Mand 0.3 to 1.9 pc. Densities of the clumps range between (0.5-6) ×10 4 cm −3 . We have decomposed the continuum emission into Gaussian and arbitrary shaped clumps using the two independent structure analysis tools gaussclumps and clumpfind respectively. The clump mass spectrum was found to have an index α of 1.6 ± 0.3, independent of the decomposition algorithm used. The index of the mass spectrum for the mass and length scales covered here are consistent with results derived from large scale CO observations.