Constraining the thermal dust content of Lyman break galaxies in an overdense field at z ≈ 5
Constraining the thermal dust content of Lyman break galaxies in an overdense field at z ≈ 5
复制标题
限制 z ≈ 5 处过密场中莱曼断裂星系的热尘埃含量
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Lehnert
中科院分区：
文献类型：
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作者：
E. Stanway;M. Bremer;L. Davies;M. Lehnert
我们已经在J 1040.7 −1155场中进行了870 μm的观测，已知在z= 5.16 ± 0.05处有过密度的莱曼破裂星系。我们在S870 μm= 3.0 mJy束流−1（2σ）水平上没有探测到任何单独的源。9个z > 5的星系叠加在一起也无法探测到，这限制了一个典型星系在此红移下的亚毫米级通量为S870 μm < 0.85 mJy，对应于质量极限M dust < 1.2 × 108 M <$（2σ）。这限制了遥远的莱曼破裂星系中热尘的质量，使其小于典型恒星质量的十分之一。我们没有看到与紫外线选择的星系过密度相关的强大亚毫米星系的证据，但不能排除存在较暗，质量较小的来源。
We have carried out 870-μm observations in the J1040.7−1155 field, known to host an overdensity of Lyman break galaxies at z= 5.16 ± 0.05. We do not detect any individual source at the S870 μm= 3.0 mJy beam−1 (2σ) level. A stack of nine spectroscopically confirmed z > 5 galaxies also yields a non-detection, constraining the submillimetre flux from a typical galaxy at this redshift to S870 μm < 0.85 mJy, which corresponds to a mass limit Mdust < 1.2 × 108 M⊙ (2σ). This limits the mass of thermal dust in distant Lyman break galaxies to less than one-tenth of their typical stellar mass. We see no evidence for strong submillimetre galaxies associated with the ultraviolet-selected galaxy overdensity, but cannot rule out the presence of fainter, less massive sources.