WISH for deep and wide NIR surveys
WISH for deep and wide NIR surveys
复制标题
希望进行深入而广泛的 NIR 调查
DOI：
10.1117/12.925632
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
et al.
中科院分区：
文献类型：
--
作者：
T. Yamada;et al.
WISH （Wide-field Imaging Surveyor for high -redshift）是在1-5μm近红外波段进行非常深和宽视场的观测，以研究宇宙再电离时代之后的非常高红移星系的性质的太空任务概念。该概念自2008年以来一直在开发和研究，并将用于未来的JAXA/ISAS任务。WISH有一个直径1.5米的主镜和一个覆盖850角的广角成像仪。像素尺度为0.155 arcsec，间距为18μm，可以很好地采样1.5μm的衍射极限图像。主要项目是超深探测（UDS），覆盖100度至28AB等至少5个宽带。我们期望在z=8-9处探测到<104星系，在z=11-12处探测到103-104星系，在z<14处探测到50-100个星系，其中许多都可以成为使用超大望远镜进行深度光谱的可行目标。通过反复的深空观测，对ia型超新星进行静帧红外波段的探测和光曲线监测，这是该任务的另一个主要科学目标。在为期5年的在轨观测中，我们预计将探测和监测到<2000颗ia型超新星，最高可达z~2。WISH还开展了超宽观测（Ultra Wide Survey），覆盖范围为1000度至24-25AB等，以及极限观测（Extreme Survey），覆盖范围为有限的视场，覆盖范围为29-30AB等。我们在这里报告WISH项目的进展，包括基本望远镜和卫星设计，以及翻转式滤波器交换器原型模型的测试结果，该模型在100K附近稳定工作。
WISH, Wide-field Imaging Surveyor for High-redshiftt, is a space mission concept to conduct very deep and widefield surveys at near infrared wavelength at 1-5μm to study the properties of galaxies at very high redshift beyond the epoch of cosmic reionization. The concept has been developed and studied since 2008 to be proposed for future JAXA/ISAS mission. WISH has a 1.5m-diameter primary mirror and a wide-field imager covering 850 arcmin2. The pixel scale is 0.155 arcsec for 18μm pitch, which properly samples the diffraction-limited image at 1.5μm. The main program is Ultra Deep Survey (UDS) covering 100 deg2down to 28AB mag at least in five broad bands. We expect to detect <104galaxies at z=8-9, 103-104galaxies at z=11-12, and 50-100 galaxies at z<14, many of which can be feasible targets for deep spectroscopy with Extremely Large Telescopes. With recurrent deep observations, detection and light curve monitoring for type-Ia SNe in rest-frame infrared wavelength is also conducted, which is another main science goal of the mission. During the in-orbit 5 years observations, we expect to detect and monitor <2000 type-Ia SNe up to z~2. WISH also conducts Ultra Wide Survey, covering 1000deg2down to 24-25AB mag as well as Extreme Survey, covering a limited number of fields of view down to 29-30AB mag. We here report the progress of the WISH project including the basic telescope and satellite design as well as the results of the test for a proto-model of the flip-type filter exchanger which works robustly near 100K.