The ALHAMBRA Project: A large area multi medium-band optical and NIR photometric survey-猫眼课题宝

DOI：

10.1088/0004-6256/136/3/1325

发表时间：

2008-06

期刊：

arXiv: Astrophysics

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

M. Molés;N. Benı́tez;J. Aguerri;E. Alfaro;T. Broadhurst;J. Cabrera-Cano;F. Castander;J. Cepa;M. Cerviño;D. Cristóbal-Hornillos;A. Fernández-Soto;R. Delgado;L. Infante;I. Márquez;V. Martínez;J. Masegosa;A. Olmo;J. Perea;F. Prada;J. Quintana;Samuel Sanchez

我们描述了阿尔汉布拉调查的第一批结果，该调查提供了宇宙历史上大部分宇宙内容演变的宇宙层析成像。我们的方法采用了20个连续的，等宽的，中波段滤波器，覆盖从3500到9700 A，加上JHKs波段，观察天空中4平方度的区域。光学测光系统的设计是为了最大限度地增加通过SED和红移准确分类的物体数量，并对相对微弱的发射线敏感。观测是用Calar Alto 3.5米望远镜，使用LAICA和O-2000照相机进行的。第一个数据证实，我们在蓝色到8300 A的光学滤光片中达到了AB<~25等的预期星等极限，而在红色滤光片中达到了AB=24.7到23.4等的预期星等极限。在近红外光谱中的极限为（Vega）K_s~20，H~21，J~22。我们期望得到精确的红移值，对于约5 × 10^5个星系，Δ z/（1+z）<~ 0.03，I<~25（60%完成），z_med=0.74。这种精确性，加上选择函数的均匀性，将允许研究大尺度结构的红移演化，星系人口及其随红移的演化，星系团的识别以及许多其他研究，而不需要任何进一步的后续工作。它还将为10米级望远镜的详细研究提供目标。鉴于其面积、光谱覆盖范围和深度，除了这些主要目标外，ALHAMBRA巡天还将为银河系研究提供宝贵的数据。

(ABRIDGED) We describe the first results of the ALHAMBRA survey which provides cosmic tomography of the evolution of the contents of the Universe over most of Cosmic history. Our approach employs 20 contiguous, equal-width, medium-band filters covering from 3500 to 9700 A, plus the JHKs bands, to observe an area of 4 sqdeg on the sky. The optical photometric system has been designed to maximize the number of objects with accurate classification by SED and redshift, and to be sensitive to relatively faint emission lines. The observations are being carried out with the Calar Alto 3.5m telescope using the cameras LAICA and O-2000. The first data confirm that we are reaching the expected magnitude limits of AB<~25 mag in the optical filters from the blue to 8300 A, and from AB=24.7 to 23.4 for the redder ones. The limit in the NIR is (Vega) K_s~20, H~21, J~22. We expect to obtain accurate redshift values, Delta z/(1+z) <~ 0.03 for about 5x10^5 galaxies with I<~25 (60% complete), and z_med=0.74. This accuracy, together with the homogeneity of the selection function, will allow for the study of the redshift evolution of the large scale structure, the galaxy population and its evolution with redshift, the identification of clusters of galaxies, and many other studies, without the need for any further follow-up. It will also provide targets for detailed studies with 10m-class telescopes. Given its area, spectral coverage and its depth, apart from those main goals, the ALHAMBRA-Survey will also produce valuable data for galactic studies.

The ALHAMBRA Project: A large area multi medium-band optical and NIR photometric survey

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