Gemini H-Band Imaging of the Field of a z = 10 Candidate
Gemini H-Band Imaging of the Field of a z = 10 Candidate
复制标题
z = 10 候选区域的 Gemini H 波段成像
DOI：
--
复制
发表时间：
2004
期刊：
影响因子：
--
通讯作者：
L. Douglas
中科院分区：
文献类型：
--
作者：
M. Bremer;J. Jensen;M. Lehnert;N. F. Schreiber;L. Douglas
我们提出了一个深H波段图像的候选人z = 10星系的前景（z = 0.25）集群A1835放大的字段。该图像是通过Gemini-North上的NIRI获得的，以更好地约束测光并研究源的形态。该图像比Pelló等人在甚大望远镜上使用ISAAC获得的现有H波段图像深约1等，具有更好的空间分辨率（视宁度为0.“4-0.”5）。根据已发表的光度测定法（HAB = 25.0），我们可以预期在直径为1.4 ″的孔径中，在~7 σ以上的位置上可以探测到它。我们得到了HAB > 26.0（3 σ）的极限。该天体位于z = 10的主要证据是在J和H带之间存在一个强的连续谱断裂，这是由于该天体的静止坐标系吸收了所有1216的连续谱。我们的H波段探测不到，大大降低了任何破裂的幅度，因此削弱了这个物体位于z = 10的情况。如果没有明显的连续谱断裂，则不太可能将1.33745 μm处的发射线识别为z = 10的Lyα。我们发现，这条谱线的宽度和通量与另一条谱线（如来自中等红移H II/矮星系的[O III] λ5007）是一致的。
We present a deep H-band image of the field of a candidate z = 10 galaxy magnified by the foreground (z = 0.25) cluster A1835. The image was obtained with NIRI on Gemini-North to better constrain the photometry and investigate the morphology of the source. The image is approximately 1 mag deeper and has better spatial resolution (seeing was 0.″4-0.″5) than the existing H-band image obtained with ISAAC on the Very Large Telescope by Pelló et al. The object is not detected in our new data. Given the published photometry (HAB = 25.0), we would have expected it to have been detected at more than ~7 σ in a 1.″4 diameter aperture. We obtain a limit of HAB > 26.0 (3 σ) for the object. A major part of the evidence that this object is at z = 10 was the presence of a strong continuum break between the J and H bands, attributed to absorption of all continuum shortward of 1216 Å in the rest frame of the object. Our H-band nondetection substantially reduces the magnitude of any break and therefore weakens the case that this object is at z = 10. Without a clear continuum break, the identification of an emission line at 1.33745 μm as Lyα at z ≈ 10 is less likely. We show that the width and flux of this line are consistent with an alternative emission line such as [O III] λ5007 from an intermediate-redshift H II/dwarf galaxy.