利用 Espresso 的基础物理研究：面向精细结构常数精密检验的准确波长定标
天体物理仪器与方法
2021-02-24 v1 宇宙学与河外天体物理
星系天体物理
摘要
对遥远类星体光谱中金属吸收系统的观测可约束精细结构常数在宇宙历史中的可能变化。此类检验对波长精度提出了极高要求，且以往研究受限于光谱仪波长定标中的系统误差。因此，新近安装于 VLT 的超高稳定性高分辨率光谱仪 Espresso 有望大幅推动该领域发展。作为 Espresso GTO 计划中基础物理相关部分的准备，我们全面评估了 Espresso 的波长精度，并识别了波长定标过程中各步骤可能存在的系统误差。最为重要的是，我们将基于钍氩弧灯光谱与法布里-珀罗干涉仪组合的默认波长解，与由激光频率梳获得的完全独立定标进行了比较。我们发现高达 24m/s 的波长相关偏差。这远超光子噪声，并凸显了不同系统误差源的存在，我们在本研究中对其进行了详细刻画。尽管如此，我们的研究证明了 Espresso 相对于以往所用光谱仪的卓越精度，并且表明利用 Espresso 可在不受波长定标系统误差限制的情况下，获得精细结构常数相对变化在 量级的约束。
引用
@article{arxiv.2011.13963,
title = {Fundamental physics with Espresso: Towards an accurate wavelength calibration for a precision test of the fine-structure constant},
author = {Tobias M. Schmidt and Paolo Molaro and Michael T. Murphy and Christophe Lovis and Guido Cupani and Stefano Cristiani and Francesco A. Pepe and Rafael Rebolo and Nuno C. Santos and Manuel Abreu and Vardan Adibekyan and Yann Alibert and Matteo Aliverti and Romain Allart and Carlos Allende Prieto and David Alves and Veronica Baldini and Christopher Broeg and Alexandre Cabral and Giorgio Calderone and Roberto Cirami and João Coelho and Igor Coretti and Valentina D'Odorico and Paolo Di Marcantonio and David Ehrenreich and Pedro Figueira and Matteo Genoni and Ricardo Génova Santos and Jonay I. González Hernández and Florian Kerber and Marco Landoni and Ana C. O. Leite and Jean-Louis Lizon and Gaspare Lo Curto and Antonio Manescau and Carlos J. A. P. Martins and Denis Megévand and Andrea Mehner and Giuseppina Micela and Andrea Modigliani and Manuel Monteiro and Mario J. P. F. G. Monteiro and Eric Mueller and Nelson J. Nunes and Luca Oggioni and António Oliveira and Giorgio Pariani and Luca Pasquini and Edoardo Redaelli and Marco Riva and Pedro Santos and Danuta Sosnowska and Sérgio G. Sousa and Alessandro Sozzetti and Alejandro Suárez Mascareño and Stéphane Udry and Maria-Rosa Zapatero Osorio and Filippo Zerbi},
journal= {arXiv preprint arXiv:2011.13963},
year = {2021}
}
备注
27 pages, accepted for publication in A&A