在1 $\lesssim$ z $\lesssim$ 1.5处的QSO三元组的环境
The environment of QSO triplets at 1 $\lesssim$ z $\lesssim$ 1.5
摘要：
通过分析CFHT望远镜Megacam获得的多波段（r，i，z，或g，r，i）图像，分析了位于1 $\lesssim$ z $\lesssim$ 1.5的6个类星体三重态的环境，旨在研究它们是否与星系原团相关。这是通过使用COSMOS 2015星表的高精度测光红移训练的测光红移来完成的。为了提高我们的测光红移估计的质量，我们在我们的分析包括近红外测光（3.6和4.5 $μm$）从unWISE调查可用于我们的领域和COSMOS调查。这种方法使我们能够获得良好的光度红移与色散，测量与强大的西格玛NMAD统计$\sim$ 0.04为我们的六个领域。我们的分析设置是复制的光锥构造的千禧年模拟数据和最新版本的L-GALAXIES半解析模型，以验证在这种条件下的原星系团的可探测性。然后用高斯核密度估计器分析了包含每个三重态的红移板中的密度场。我们没有发现任何明显的证据表明三胞胎居住在致密的结构中，例如大质量的星系团或原星系团。
英文摘要：
We present an analysis of the environment of six QSO triplets at 1 $\lesssim$ z $\lesssim$ 1.5 by analyzing multiband (r,i,z, or g,r,i) images obtained with Megacam at the CFHT telescope, aiming to investigate whether they are associated or not with galaxy protoclusters. This was done by using photometric redshifts trained using the high accuracy photometric redshifts of the COSMOS2015 catalogue. To improve the quality of our photometric redshift estimation, we included in our analysis near-infrared photometry (3.6 and 4.5 $μm$) from the unWISE survey available for our fields and the COSMOS survey. This approach allowed us to obtain good photometric redshifts with dispersion, as measured with the robust Sigma NMAD statistics of $\sim$ 0.04 for our six fields. Our analysis setup was reproduced on lightcones constructed from the Millennium Simulation data and the latest version of the L-GALAXIES semi-analytic model to verify the protocluster detectability in such conditions. The density field in a redshift slab containing each triplet was then analyzed with a Gaussian kernel density estimator. We did not find any significant evidence of the triplets inhabiting dense structures, such as a massive galaxy cluster or protocluster.
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