Submillimeter Imaging of a Protocluster Region at z = 3.09
Submillimeter Imaging of a Protocluster Region at z = 3.09
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z = 3.09 处原星团区域的亚毫米成像
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
A. Shapley
中科院分区：
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作者：
S. Chapman;G. Lewis;D. Scott;E. Richards;C. Borys;C. Steidel;K. Adelberger;A. Shapley
我们使用詹姆斯克拉克麦克斯韦望远镜上的亚毫米普通用户辐射热计阵列（SCUBA）探测器测量了与最近发现的广泛（bbb100 h-1 kpc）和高度发光的Lyα发射“斑点”有关的明亮的亚毫米辐射，其z = 3.09。该斑点位于已知的z = 3.07-3.11范围内的大过密度光源内，并以该区域内的一个局部过密度峰为中心。对于丰富的亚毫米辐射，最好的解释是一个被尘埃遮蔽的连续源，它可能会产生Lyα云的电离通量。冷却气体的解释是合理的，但过于复杂，450/850 μm的比值排除了很大一部分由Sunyaev-Zeldovich增量产生的信号。在SCUBA地图中，至少有两个额外的表面密度明显高于空白场调查的亚毫米以下的报案点，表明它们可能与z = 3.09结构有关。对另一颗附近的Lyα星团进行的水肺“光度测定”观测，初步发现了一个较弱的亚毫米级星团。
We have used the Submillimeter Common-User Bolometer Array (SCUBA) detector on the James Clerk Maxwell Telescope to measure bright submillimeter emission associated with a recently discovered extensive (>100 h-1 kpc) and highly luminous "blob" of Lyα emission at z = 3.09. The blob lies within a known large overdensity of optical sources in the z = 3.07-3.11 range and is centered on a locally overdense peak within this region. The best explanation for the copious submillimeter emission is a dust-obscured continuum source, which may produce the ionizing flux for the Lyα cloud. Cooling gas explanations are plausible but excessively complicated, and the 450/850 μm ratio rules out a significant fraction of the signal arising from the Sunyaev-Zeldovich increment. At least two additional ≃10 mJy submillimeter detections in the SCUBA map, with a surface density significantly higher than in blank-field surveys, suggest that they may be associated with the z = 3.09 structure. A SCUBA "photometry" observation of a second nearby Lyα blob tentatively detects a weaker submillimeter counterpart.