FLASH: Faint Lenses from Associated Selection with Herschel
FLASH: Faint Lenses from Associated Selection with Herschel
复制标题
FLASH：来自赫歇尔联合选择的微弱镜头
DOI：
10.1093/mnras/stad3759
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发表时间：
2024
影响因子：
4.8
通讯作者：
Bakx T
中科院分区：
文献类型：
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作者：
Bakx T
本文报道了阿尔马7波段对86个可能包含引力透镜星系的赫歇尔源的观测结果。这些源被选择为相对较弱的500μm通量密度在15和85 mJy之间，以描述整个百万源赫歇尔目录中的透镜效应。这些透镜候选者在近红外VISTA Kilo-Degree红外星系巡天中通过它们与明亮星系的紧密接近而被识别。我们的高分辨率观测（0.15弧秒）证实了47%的初始候选者是引力透镜，而透镜不能被排除在剩余的样本之外。我们发现平均透镜质量（logM/M = 12.9 ± 0.5）与以前的实验一致，尽管直接观察可能很难在剩下的53%的样本中识别出最大质量的前景透镜，特别是对于具有较大爱因斯坦半径的透镜。我们的观察证实了以前的迹象表明，更多的透镜存在于低通量密度比预期的强星系-星系透镜模型单独，其中过剩可能是由于集群透镜和弱透镜的额外贡献。如果我们将我们的方法应用于整个660平方度的H-ATLAS场，它将使我们能够在660平方度的HerschelATLAS场中稳健地识别3000个引力透镜。
We report the ALMA Band 7 observations of 86Herschelsources that likely contain gravitationally lensed galaxies. These sources are selected with relatively faint 500μm flux densities between 15 and 85 mJy in an effort to characterize the effect of lensing across the entire million-sourceHerschelcatalogue. These lensed candidates were identified by their close proximity to bright galaxies in the near-infrared VISTA Kilo-Degree Infrared Galaxy survey. Our high-resolution observations (0.15 arcsec) confirm 47 per cent of the initial candidates as gravitational lenses, while lensing cannot be excluded across the remaining sample. We find average lensing masses (logM/M⊙= 12.9 ± 0.5) in line with previous experiments, although direct observations might struggle to identify the most massive foreground lenses across the remaining 53 per cent of the sample, particularly for lenses with larger Einstein radii. Our observations confirm previous indications that more lenses exist at low flux densities than expected from strong galaxy–galaxy lensing models alone, where the excess is likely due to additional contributions of cluster lenses and weak lensing. If we apply our method across the total 660 square degree H-ATLAS field, it would allow us to robustly identify 3000 gravitational lenses across the 660 square degreeHerschelATLAS fields.