Sloan数字巡天重叠区发现8个z ~ 6类星体
Discovery of Eight z ~ 6 Quasars in the Sloan Digital Sky Survey Overlap Regions
摘要：
本文介绍了在斯隆数字巡天（SDSS）重叠区发现的8个z~6类星体。单独的SDSS成像运行彼此有一些重叠，导致重复观测超过4000 deg^2的区域（超过总足迹的1/4）。这些重叠区域提供了一个独特的数据集，使我们能够选择高红移类星体超过0.5等暗在z波段比发现SDSS单历元数据。我们的类星体候选者首先被选为SDSS成像数据库中的i波段脱落对象。然后，我们在光学和近红外进行了一系列后续观测，以改善测光，去除污染物，并识别类星体。这里报告的八个类星体是在利用高银河纬度（|b| >30度）重叠区域的试点研究中发现的。这些类星体的红移范围为5.86<z<6.06，流量范围为19.3<z_AB<20.6等，其中5个比SDSS单历元图像中z~6类星体的典型星等极限z_AB=20等更暗。此外，我们恢复了8个先前已知的类星体在z~6，位于重叠区域。这些结果验证了我们从重叠区域中选择类星体候选者并通过后续观测确认它们的程序，并为未来在所有SDSS成像区域进行重复观测的系统调查提供指导。
英文摘要：
We present the discovery of eight quasars at z~6 identified in the Sloan Digital Sky Survey (SDSS) overlap regions. Individual SDSS imaging runs have some overlap with each other, leading to repeat observations over an area spanning >4000 deg^2 (more than 1/4 of the total footprint). These overlap regions provide a unique dataset that allows us to select high-redshift quasars more than 0.5 mag fainter in the z band than those found with the SDSS single-epoch data. Our quasar candidates were first selected as i-band dropout objects in the SDSS imaging database. We then carried out a series of follow-up observations in the optical and near-IR to improve photometry, remove contaminants, and identify quasars. The eight quasars reported here were discovered in a pilot study utilizing the overlap regions at high galactic latitude (|b|>30 deg). These quasars span a redshift range of 5.86<z<6.06 and a flux range of 19.3<z_AB<20.6 mag. Five of them are fainter than z_AB=20 mag, the typical magnitude limit of z~6 quasars used for the SDSS single-epoch images. In addition, we recover eight previously known quasars at z~6 that are located in the overlap regions. These results validate our procedure for selecting quasar candidates from the overlap regions and confirming them with follow-up observations, and provide guidance to a future systematic survey over all SDSS imaging regions with repeat observations.
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