Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI)
Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI)
复制标题
DOI：
10.1051/0004-6361/201937030
复制
发表时间：
2019-11
影响因子：
6.5
通讯作者：
J. Chan;S. Suyu;A. Sonnenfeld;A. Jaelani;A. More;A. Yonehara;Yuriko Kubota;J. Coupon;Chien-Hsiu L
中科院分区：
文献类型：
--
作者：
J. Chan;S. Suyu;A. Sonnenfeld;A. Jaelani;A. More;A. Yonehara;Yuriko Kubota;J. Coupon;Chien-Hsiu L
强引力透镜类星体为研究星系演化和宇宙学提供了强有力的手段。我们使用CHITAH，这是一种算法，用于寻找新的透镜系统，特别是透镜类星体，在超级超级凸轮斯巴鲁战略计划（HSC SSP） S16A中。我们提出了46个候选透镜，其中3个是已知的。我们从CHITAH中选择了四个高级别候选者进行光谱后续观测，并包括另外两个由YATTALENS发现的透镜，这是一种用于对透镜星系进行分类的算法。我们获得了这六个有希望的候选者的x射光谱，用于透镜确认和红移测量。我们报告了四个透镜系统中透镜星系和源星系的新光谱红移测量结果。我们应用镜头建模软件GLEE对我们的6个x -射手镜头进行了均匀建模。通过对HSC图像的分析，我们发现HSCJ022622−042522、HSCJ115252+004733和HSCJ141136−010216具有点状透镜图像，并且透镜光分布与透镜质量分布在6°范围内很好地对齐。我们使用x射射光谱估计透镜源发射线的通量，并使用线比作为baldwin - philips - terlevich （BPT）图的诊断。基于[N II]通量强度上限，我们发现HSCJ022622−042522可能存在类星体源。我们还测量了HSCJ141136 - 010216的Lyα发射的FWHM为~ 233 km s - 1，表明它可能是Lyman-α发射体。
Strong gravitationally lensed quasars provide a powerful means to study galaxy evolution and cosmology. We use CHITAH, which is an algorithm used to hunt for new lens systems, particularly lensed quasars, in the Hyper Suprime-Cam Subaru Strategic Program (HSC SSP) S16A. We present 46 lens candidates, of which 3 are previously known. We select four high-grade candidates from CHITAH for spectroscopic follow-up observations, and include two additional lenses found by YATTALENS, an algorithm used to classify lensed galaxies. We obtain X-shooter spectra of these six promising candidates for lens confirmation and redshift measurements. We report new spectroscopic redshift measurements for both the lens and source galaxies in four lens systems. We apply the lens modeling software GLEE to model our six X-shooter lenses uniformly. Through our analysis of the HSC images, we find that HSCJ022622−042522, HSCJ115252+004733, and HSCJ141136−010216 have point-like lensed images, and that the lens light distribution is well aligned with the lens mass distribution within 6 deg. We estimate the fluxes of the lensed source emission lines using X-shooter spectra, and use line ratio as a diagnostic on the Baldwin-Phillips-Terlevich (BPT) diagram. As a result, we find that HSCJ022622−042522 has a probable quasar source based on the upper limit of the [N II] flux intensity. We also measure the FWHM of Lyα emission of HSCJ141136−010216 to be ∼233 km s−1, showing that it is a probable Lyman-α emitter.