用1米级望远镜观测Y波段天空
A Y-band look of the sky with 1-m class telescopes
摘要：
Y波段是一个宽的通带，中心约为1微米.由于最近CCD技术的发展，它正在成为河外研究特别是观测红色物体的一个新的、受欢迎的窗口。为了更好地了解Y波段天体的一般特征，并探讨小望远镜Y波段观测的前景，我们利用Y波段滤光片在Mt.莱蒙光学天文台和迈达纳克天文台。根据观测结果，我们对银河系亮端和Y波段恒星数进行了约束。此外，我们还测试了利用i-z-Y色色图选择高红移类星体（z > 6）的有效性，证明了即使在1米级望远镜上安装常规光学CCD相机，i-z-Y色色图也能有效地选择高红移类星体。
英文摘要：
Y -band is a broad passband that is centered at ~ 1 micron. It is becoming a new, popular window for extragalactic study especially for observation of red objects thanks to recent CCD technology developments. In order to better understand the general characteristics of objects in Y -band, and to investigate the promise of Y -band observations with small telescopes, we carried out imaging observation of several extragalactic fields, brown dwarfs and high redshift quasars with Y -band filter at the Mt. Lemmon Optical Astronomy Observatory and the Maidanak observatory. From our observations, we constrain the bright end of the galaxy and the stellar number counts in Y -band. Also, we test the usefulness of high redshift quasar (z > 6) selection via i-z-Y color-color diagram, to demonstrate that the i-z-Y color-color diagram is effective for the selection of high redshift quasars even with a conventional optical CCD camera installed at a 1-m class telescope.
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