The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex
The JCMT Gould Belt Survey: evidence for radiative heating and contamination in the W40 complex
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DOI：
10.1093/mnras/stw1100
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发表时间：
2016-05
影响因子：
4.8
通讯作者：
D. Rumble;J. Hatchell;K. Pattle;H. Kirk;Tom J. Wilson;J. Buckle;D. Berry;H. Broekhoven-Fiene;M. Currie;M. Fich;T. Jenness;D. Johnstone;J. Mottram;J. Mottram;D. Nutter;J. E. Pineda;J. E. Pineda;C. Quinn;C. Salji;S. Tisi;S. Walker-Smith;J. Francesco;M. Hogerheijde;D. Ward-Thompson;P. Bastien;D. Bresnahan;H. Butner;M. Chen;A. Chrysostomou;S. Coudé;C. Davis;E. Drabek-Maunder;A. Duarte-Cabral;J. Fiege;P. Friberg;R. Friesen;G. Fuller;S. Graves;J. Greaves;J. Gregson;J. Gregson;W. Holland;W. Holland;G. Joncas;J. Kirk;L. Knee;S. Mairs;K. Marsh;B. Matthews;G. Moriarty-Schieven;C. Mowat;J. Rawlings;J. Richer;D. Robertson;E. Rosolowsky;S. Sadavoy;H. Thomas;N. Tothill;S. Viti;G. White;G. White;J. Wouterloot;J. Yates;M. Zhu
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文献类型：
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作者：
D. Rumble;J. Hatchell;K. Pattle;H. Kirk;Tom J. Wilson;J. Buckle;D. Berry;H. Broekhoven-Fiene;M. Currie;M. Fich;T. Jenness;D. Johnstone;J. Mottram;J. Mottram;D. Nutter;J. E. Pineda;J. E. Pineda;C. Quinn;C. Salji;S. Tisi;S. Walker-Smith;J. Francesco;M. Hogerheijde;D. Ward-Thompson;P. Bastien;D. Bresnahan;H. Butner;M. Chen;A. Chrysostomou;S. Coudé;C. Davis;E. Drabek-Maunder;A. Duarte-Cabral;J. Fiege;P. Friberg;R. Friesen;G. Fuller;S. Graves;J. Greaves;J. Gregson;J. Gregson;W. Holland;W. Holland;G. Joncas;J. Kirk;L. Knee;S. Mairs;K. Marsh;B. Matthews;G. Moriarty-Schieven;C. Mowat;J. Rawlings;J. Richer;D. Robertson;E. Rosolowsky;S. Sadavoy;H. Thomas;N. Tothill;S. Viti;G. White;G. White;J. Wouterloot;J. Yates;M. Zhu
作为詹姆斯·克拉克麦克斯韦望远镜（JCMT）古尔德带巡天（GBS）的一部分，我们介绍了SCUBA-2在450 μm和850 μm波段对蛇座-天鹰座区域W 40复合体的观测结果。我们通过使用固定的尘埃不透明度光谱指数β = 1.8和光束卷积核来实现14.8角秒的分辨率，从SCUBA-2通量的比率构建温度图来研究辐射加热。我们识别了82个温度范围在10到36 K之间的团块，平均温度为20 ± 3 K。星团温度与外部OB星协的接近程度密切相关，没有证据表明嵌入的原恒星显著加热了尘埃。我们确定了31个星团的核心密度大于105 cm −3。其中13个核心包含嵌入的0/I类原恒星。许多核心与赫歇尔70 μm图像中看到的明亮边缘云有关。从JCMT HARP对12 CO 3-2线的观测中，我们发现850 μm波段的污染高达20%。我们使用VLA档案数据研究了大规模和超紧凑HII区域对SCUBA-2波段的自由贡献，发现贡献仅限于单个恒星，在这些情况下，在450 μm处占每个光束通量的9%，在850 μm处占12%。我们的结论是，辐射加热可能会影响尘埃弧子区域的恒星的形成，有利于牛仔裤稳定的云在温暖的东部和寒冷的西部的碎片。
We present SCUBA-2 450 μm and 850 μm observations of the W40 complex in the Serpens-Aquila region as part of the James Clerk Maxwell Telescope (JCMT) Gould Belt Survey (GBS) of nearby star-forming regions. We investigate radiative heating by constructing temperature maps from the ratio of SCUBA-2 fluxes using a fixed dust opacity spectral index, β = 1.8, and a beam convolution kernel to achieve a common 14.8 arcsec resolution.We identify 82 clumps ranging between 10 and 36 K with a mean temperature of 20 ± 3 K. Clump temperature is strongly correlated with proximity to the external OB association and there is no evidence that the embedded protostars significantly heat the dust.We identify 31 clumps that have cores with densities greater than 105cm−3. 13 of these cores contain embedded Class 0/I protostars. Many cores are associated with bright-rimmed clouds seen in Herschel 70 μm images. From JCMT HARP observations of the 12CO 3–2 line, we find contamination of the 850 μm band of up to 20 per cent. We investigate the free–free contribution to SCUBA-2 bands from large-scale and ultracompact HII regions using archival VLA data and find the contribution is limited to individual stars, accounting for 9 per cent of flux per beam at 450 μm or 12 per cent at 850 μm in these cases. We conclude that radiative heating has potentially influenced the formation of stars in the Dust Arc sub-region, favouring Jeans stable clouds in the warm east and fragmentation in the cool west.