Near-infrared imaging of nearby galaxies

近红外波段的广场成像对于研究附近的星系和银河系中的恒星形成区是很重要的，但目前还没有进行这方面的研究，因为既没有平板也没有大尺寸的阵列，它们对波长的灵敏度都不超过^&lt；1。我们已经测试了一种独特的组合，即具有大幅面阵列的红外相机和快速f比望远镜。探测器采用PtSi阵列。阵列大小为512×512像素，像素大小为26微米×20微米。当安装在KISO天文台105厘米施密特望远镜的主焦点上时，视场为14‘x 11’，像素分辨率为1.6“X1.3”。虽然阵列的量子效率较低，但相机良好的均匀性、稳定性和低读出噪声，加上望远镜的快速f比，使得在H波段曝光70分钟获得的图像的校准精度为天空背景的0.1%。目前正在开发一款采用PTSI 1040x1040芯片的相机，使用的芯片具有改进的量子效率和填充因子。基索·施密特望远镜主焦点的视场将为18.4‘x 18.4’。它将成为对表观尺寸较大的物体成像和进行测量的强大工具。我们正计划获得附近星系在光学和红外波长下的多色光度测量。

Wide field imaging in near-infrared bands, which is important for studies of nearby galaxies and star forming regions in our Galaxy, has not been performed yet, since neither plates nor large format arrays sensitive at wavelength longer than ^<1 \mu m> were available. We have tested a unique combination of an infrared camera with a large format array and a fast f-ratio telescope. The detector used PtSi array. The array size is 512x512 pixels, and the pixel size is 26 micron x 20 micron. The field of view is 14' x 11' and the pixel resolution is 1.6" x1.3" when attached to the prime focus of the 105cm Schmidt telescope at Kiso observatory. Though the quantum efficiency of the array is low, the excellent uniformity, stability and low read-out noise of the camera combined with the fast f-ratio of the telescope resulted in a calibration accuracy of 0.1% of the sky background in a image obtained through 70 minute exposure in the H-band.A camera with PtSi 1040x1040 chip is now under development, using a chip with an improved quantum efficiency and filling factor. The field of view will be 18.4' x 18.4' at prime focus of the Kiso Schmidt telescope. It will be a powerful tool for imaging objects of large apparent size and for surveys. We are planning to obtain multi-color photometry at optical and infrared wavelengths of nearby galaxies.