大双目望远镜蓝主焦点大双目相机的性能
The performance of the blue prime focus Large Binocular Camera at the Large Binocular Telescope
摘要：
我们介绍了大双筒望远镜（LBT）的第一台仪器--大双筒相机（LBC）的特点和一些早期的科学成果。每个LBT望远镜单元将配备类似的主焦点相机。蓝色通道针对UV-B波段的成像进行了优化，红色通道针对VRIz波段的成像进行了优化。每个摄像机的校正视场直径约为30弧分，芯片面积相当于23x23弧分2视场。在本文中，我们还介绍了蓝色通道的调试结果。蓝色通道的科学和技术性能通过测量天体测量失真、平场、重影和光度校准进行评估。然后，这些测量值被用作应用于科学调试数据的数据简化管道的输入。调试期间完成的测量表明，蓝色通道的技术性能与最初的预期一致。由于红色摄像机与蓝色摄像机非常相似，我们预计在接下来的几个月里将在双目配置中进行的调试中会有类似的性能。使用深紫外图像，在蓝色相机的调试过程中获得的，我们推导出微弱的紫外星系计数在~500平方米。弧分天空面积对U（织女星）= 26.5。这些星系数量意味着蓝色相机是目前最强大的紫外成像仪，在不久的将来，就视野的深度和范围而言。我们强调的潜力，蓝色相机，以增加鲁棒性的UGR多色选择的Lyman break星系在红移z~3。
英文摘要：
We present the characteristics and some early scientific results of the first instrument at the Large Binocular Telescope (LBT), the Large Binocular Camera (LBC). Each LBT telescope unit will be equipped with similar prime focus cameras. The blue channel is optimized for imaging in the UV-B bands and the red channel for imaging in the VRIz bands. The corrected field-of-view of each camera is approximately 30 arcminutes in diameter, and the chip area is equivalent to a 23x23 arcmin2 field. In this paper we also present the commissioning results of the blue channel. The scientific and technical performance of the blue channel was assessed by measurement of the astrometric distortion, flat fielding, ghosts, and photometric calibrations. These measurements were then used as input to a data reduction pipeline applied to science commissioning data. The measurements completed during commissioning show that the technical performance of the blue channel is in agreement with original expectations. Since the red camera is very similar to the blue one we expect similar performance from the commissioning that will be performed in the following months in binocular configuration. Using deep UV image, acquired during the commissioning of the blue camera, we derived faint UV galaxy-counts in a ~500 sq. arcmin. sky area to U(Vega)=26.5. These galaxy counts imply that the blue camera is the most powerful UV imager presently available and in the near future in terms of depth and extent of the field-of-view. We emphasize the potential of the blue camera to increase the robustness of the UGR multicolour selection of Lyman break galaxies at redshift z~3.
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