暗能量相机首个窄带滤光片的设计：为约7个星系优化LAGER巡天

Design For The First Narrowband Filter For The Dark Energy Camera: Optimizing The LAGER Survey For ~ 7 Galaxies.

作者信息

Zheng Zhen-Ya, Rhoads James E, Wang Junxian, Malhotra Sangeeta, Walker Alistair, Mooney Thomas, Jiang Chunyan, Hu Weida, Hibon Pascale, Jiang Linhua, Infante Leopoldo, Barrientos L Felipe, Galaz Gaspar, Valdes Francisco, Wester William, Yang Huan, Coughlin Alicia, Harish Santosh, Kang Wenyong, Khostovan Ali Ahmad, Kong Xu, Perez Lucia A, Pharo John, Wold Isak, Zheng XianZhong

机构信息

CAS Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Shanghai 200030, China.

Astrophysics Science Division, Goddard Space Flight Center, 8800 Greenbelt Road, Greenbelt, MD 20771, USA.

出版信息

Publ Astron Soc Pac. 2019 Jul 1;131(1001). doi: 10.1088/1538-3873/ab1c32. Epub 2019 Jun 3.

DOI:10.1088/1538-3873/ab1c32

PMID:33505044

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7837426/

Abstract

We present the design for the first narrowband filter NB964 for the Dark Energy Camera (DECam), which is operated on the 4m Blanco Telescope at the Cerro Tololo Inter-American Observatory. The NB964 filter profile is essentially defined by maximizing the power of searching for Lyman alpha emitting galaxies (LAEs) in the epoch of reionization, with the consideration of the night sky background in the near-infrared and the DECam quantum efficiency. The NB964 filter was manufactured by Materion in 2015. It has a central wavelength of 964.2 nm and a full width at half maximum (FWHM) of 9.2 nm. An NB964 survey named LAGER (Lyman Alpha Galaxies in the Epoch of Reionization) has been ongoing since December 2015. Here we report results of lab tests, on-site tests and observations with the NB964 filter. The excellent performances of this filter ensure that the LAGER project is able to detect LAEs at ~ 7 with a high efficiency.

摘要

我们展示了为暗能量相机（DECam）设计的首个窄带滤光片NB964，该滤光片在位于托洛洛山美洲天文台的4米布兰科望远镜上运行。NB964滤光片的轮廓主要是通过在再电离时期最大化搜索莱曼α发射星系（LAE）的能力来定义的，同时考虑了近红外波段的夜空背景和DECam的量子效率。NB964滤光片由迈图高新材料集团（Materion）于2015年制造。它的中心波长为964.2纳米，半高全宽（FWHM）为9.2纳米。自2015年12月以来，一项名为LAGER（再电离时期的莱曼α星系）的NB964巡天观测一直在进行。在此，我们报告使用NB964滤光片进行实验室测试、现场测试和观测的结果。该滤光片的出色性能确保了LAGER项目能够高效地探测到红移约为7的LAE。