DESI银河系巡天概述
摘要
我们描述了将在基特峰国家天文台Mayall 4米望远镜上用暗能量光谱仪（Dark Energy Spectroscopic Instrument, DESI）开展的银河系巡天（Milky Way Survey, MWS）。未来5年内，DESI MWS将观测银纬 |b|>20 度处约七百万颗恒星，采用聚焦于厚盘与恒星晕的包容性目标选择方案。MWS还将包含若干高完备度的稀有恒星类型样本，包括白矮星、太阳100pc内的低质量恒星以及水平分支星。我们总结了DESI在推进银河系结构与恒星演化理解方面的潜力。我们介绍了主要MWS目标类别的最终定义，并估算每类中将被观测的恒星数量。我们描述了推导视向速度、大气参数与化学丰度的流水线。我们利用来自DESI巡天验证计划（SV）约500,000条独特恒星目标光谱证明，我们的流水线能为典型主样本恒星测量约1 km/s的视向速度与精度约0.2 dex的 [Fe/H]。我们发现，在 >90% 主样本完备度的约100平方度SV观测中，恒星参数分布与模拟星表及先前巡天的预期吻合良好。
引用
@article{arxiv.2208.08514,
title = {Overview of the DESI Milky Way Survey},
author = {Andrew P. Cooper and Sergey E. Koposov and Carlos Allende Prieto and Christopher J. Manser and Namitha Kizhuprakkat and Adam D. Myers and Arjun Dey and Boris T. Gaensicke and Ting S. Li and Constance Rockosi and Monica Valluri and Joan Najita and Alis Deason and Anand Raichoor and Mei-Yu Wang and Yuan-Sen Ting and Bokyoung Kim and Andreia Carrillo and Wenting Wang and Leandro Beraldo e Silva and Jiwon Jesse Han and Jiani Ding and Miguel Sanchez-Conde and Jessica N. Aguilar and Steven Ahlen and Stephen Bailey and Vasily Belokurov and David Brooks and Katia Cunha and Kyle Dawson and Axel de la Macorra and Peter Doel and Daniel J. Eisenstein and Parker Fagrelius and Kevin Fanning and Andreu Font-Ribera and Jaime E. Forero-Romero and Enrique Gaztanaga and Satya Gontcho A Gontcho and Julien Guy and Klaus Honscheid and Robert Kehoe and Theodore Kisner and Anthony Kremin and Martin Landriau and Michael E. Levi and Paul Martini and Aaron M. Meisner and Ramon Miquel and John Moustakas and Jundan Nie and Nathalie Palanque-Delabrouille and Will J. Percival and Claire Poppett and Francisco Prada and Nabeel Rehemtulla and Edward Schlafly and David Schlegel and Michael Schubnell and Ray M. Sharples and Gregory Tarle and Risa H. Wechsler and David H. Weinberg and Zhimin Zhou and Hu Zou},
journal= {arXiv preprint arXiv:2208.08514},
year = {2023}
}
备注
Accepted for publication in ApJ, 44 pages, 25 figures, 4 tables, one of a suite of 8 papers detailing targeting for DESI; v2 added links to data shown in figures, added citations to other DESI papers, corrected author list and minor typos; v3 fixed minor errors in Fig. 6 and clarified associated text; v4 updated to include minor changes in response to review