UKIDSS超深巡天中KX类星体的初步观测
A Pilot Survey for KX QSOs in the UKIDSS Ultra Deep Survey Field
摘要：
我们已经进行了试点调查微弱的类星体在UKIDSS超深调查领域使用KX选择技术。这些观测利用UKIRT和斯巴鲁对该领域的极深近红外和光学成像，根据它们的VJK颜色和形态选择候选类星体。我们使用AAOmega摄谱仪在AAT上测定了426个候选者的红移。在z=1.57-3.29范围内，共发现17个类星体（M_B<= -23）。我们将我们的样本与在同一场中的类星体的X射线选择样本（其中很大一部分也符合我们的KX选择）结合起来，以限制K<=20的类星体的表面密度，从而得出可能的表面密度极限为85-150/deg^2。我们使用我们的近红外成像提供良好的图像质量来检测空间扩展的类星体光的组成部分，这可能代表了宿主星系。我们还使用我们的样本来调查路线，以改善KX类星体的选择在微弱的限制，在面对显着的污染紧凑，前景星系。从我们的组合类星体样本中最明亮的例子将被用于与一个大型的VLT VIMOS光谱调查高红移星系在这一地区的结构研究居住的气体，星系和增长的超大质量黑洞在高红移在UKIDSS UDS。
英文摘要：
We have undertaken a pilot survey for faint QSOs in the UKIDSS Ultra Deep Survey Field using the KX selection technique. These observations exploit the very deep near-infrared and optical imaging of this field from UKIRT and Subaru to select candidate QSOs based on their VJK colours and morphologies. We determined redshifts for 426 candidates using the AAOmega spectrograph on the AAT in service time. We identify 17 QSOs (M_B<= -23) in this pilot survey at z=1.57-3.29. We combine our sample with an X-ray selected sample of QSOs in the same field (a large fraction of which also comply with our KX selection) to constrain the surface density of QSOs with K<=20, deriving limits on the likely surface density of 85-150/deg^2. We use the good image quality available from our near-infrared imaging to detect a spatially extended component of the QSO light which probably represents the host galaxies. We also use our sample to investigate routes to improve the selection of KX QSOs at faint limits in the face of the significant contamination by compact, foreground galaxies. The brightest examples from our combined QSO sample will be used in conjunction with a large VLT VIMOS spectroscopic survey of high redshift galaxies in this region to study the structures inhabited by gas, galaxies and growing super-massive black holes at high redshifts in the UKIDSS UDS.
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