Probabilistic fibre-to-target assignment algorithm for multi-object spectroscopic surveys
E. Tempel, P. Norberg, T. Tuvikene, T. Bensby, C. Chiappini, N. Christlieb, M. -R. L. Cioni, J. Comparat, L. J. M. Davies, G. Guiglion, A. Koch, G. Kordopatis, … 展开作者
E. Tempel, P. Norberg, T. Tuvikene, T. Bensby, C. Chiappini, N. Christlieb, M. -R. L. Cioni, J. Comparat, L. J. M. Davies, G. Guiglion, A. Koch, G. Kordopatis, M. Krumpe, J. Loveday, A. Merloni, G. Micheva, I. Minchev, B. F. Roukema, J. G. Sorce, E. Starkenburg, J. Storm, E. Swann, W. F. Thi, G. Traven, R. S. de Jong
备注:
19 pages, 18 figures, accepted for publication in A&A
Context. Several new multi-object spectrographs are currently planned or under construction that are capable of observing thousands of Galactic and extragalactic objects simultaneously.
Aims. In this paper we present a probabilistic fibre-to-target assignment algorithm that takes spectrograph targeting constraints into account and is capable of dealing with multiple concurrent surveys. We present this algorithm using the 4-metre Multi-Object Spectroscopic Telescope (4MOST) as an example.
Methods. The key idea of the proposed algorithm is to assign probabilities to fibre-target pairs. The assignment of probabilities takes the fibre positioner's capabilities and constraints into account. Additionally, these probabilities include requirements from surveys and take the required exposure time, number density variation, and angular clustering of targets across each survey into account. The main advantage of a probabilistic approach is that it allows for accurate and easy computation of the target selection function for the different surveys, which involves determining the probability of observing a target, given an input catalogue.
Results. The probabilistic fibre-to-target assignment allows us to achieve maximally uniform completeness within a single field of view. The proposed algorithm maximises the fraction of successfully observed targets whilst minimising the selection bias as a function of exposure time. In the case of several concurrent surveys, the algorithm maximally satisfies the scientific requirements of each survey and no specific survey is penalised or prioritised.
Conclusions. The algorithm presented is a proposed solution for the 4MOST project that allows for an unbiased targeting of many simultaneous surveys. With some modifications, the algorithm may also be applied to other multi-object spectroscopic surveys.
Exploration of small footprint stick-slip piezoelectric actuators for use in the FLEX fibre positioner system for the Wide-field Spectroscopic Telescope (WST)
Australian Astronomical Optics, Macquarie Univ.(澳大利亚天文光学,麦考瑞大学);Leibniz-Institut für Astrophysik Potsdam(波茨坦莱布尼茨天体物理研究所)
Unlocking the physics of dwarf galaxies in the 2040s: The case for a next-generation wide-field spectroscopic facility with fibres and IFUs
INAF – Osservatorio Astronomico di Capodimonte(意大利国家天体物理研究所卡波迪蒙特天文台);INAF – Osservatorio Astronomico di Trieste(意大利国家天体物理研究所的里雅斯特天文台);INAF – Osservatorio Astrofisico di Arcetri(意大利国家天体物理研究所阿切尔菲天文台);Universität Innsbruck(因斯布鲁克大学);Université de Strasbourg, CNRS, Observatoire astronomique de Strasbourg(斯特拉斯堡大学,法国国家科学研究中心,斯特拉斯堡天文台);Universidad de Valladolid(巴利亚多利德大学);Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa(里斯本大学理学院空间天体物理与科学研究所);INAF – Osservatorio Astronomico d’Abruzzo(意大利国家天体物理研究所阿布鲁佐天文台);University of Manchester(曼彻斯特大学);University of Salento(萨伦托大学);Ghent University(根特大学);Leiden University(莱顿大学);Instituto de Astrofísica de Canarias(加那利群岛天体物理研究所);University of Nottingham(诺丁汉大学);Institute of Space Sciences (ICE, CSIC)(空间科学研究所(加那利高等研究委员会));University of Naples Federico II(那不勒斯费德里科二世大学);INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天体物理与空间科学天文台);University of Surrey(萨里大学);European Southern Observatory(欧洲南方天文台);Instituto de Astrofísica de Andalucía (CSIC)(安达卢西亚天体物理研究所(加那利高等研究委员会));SISSA(国际高等研究学校);University of Southampton(南安普敦大学);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室)
GALATEA: The 15-m Galactic Archaeology Spectroscopic Surveyor
Centro de Estudios de Física del Cosmos de Aragón (CEFCA)(阿拉贡宇宙物理研究中心);LERMA, CNRS, Observatoire de Paris(巴黎天文台勒默实验室);Instituto de Astrofísica de Andalucía (IAA-CSIC)(安达卢西亚天体物理学研究所);Instituto de Astrofísica de Canarias (IAC)(加那利天体物理学研究所);Universidad de La Laguna(拉古纳大学);Leibniz-Institut für Astrophysik Potsdam (AIP)(波茨坦莱布尼茨天体物理学研究所);Universidad Complutense de Madrid(马德里康普顿斯大学);University of Edinburgh(爱丁堡大学)
WST -- Wide-field Spectroscopic Telescope: The Next Leap in Wide-field Spectroscopy
Centre de Recherche Astrophysique de Lyon(里昂天体物理研究中心);Leibniz Institute for Astrophysics Potsdam (AIP)(波茨坦莱布尼茨天体物理研究所);European Southern Observatory(欧洲南方天文台);Astralis, Sydney Institute for Astronomy, School of Physics, University of Sydney(悉尼大学物理学院天文学研究所);Aix Marseille Univ., CNRS, CNES, Laboratoire d’Astrophysique de Marseille(马赛大学、法国国家科学研究中心、法国国家空间研究中心马赛天体物理实验室);INAF–IASF Milano(意大利国家天体物理研究所米兰分院);UK Astronomy Technology Centre(英国天文学技术中心);Research School of Astronomy and Astrophysics, Australian National University(澳大利亚国立大学天文学与天体物理学研究学院);University College London(伦敦大学学院);Department of Astrophysics, University of Vienna(维也纳大学天体物理系);INAF–Osservatorio Astrofisico di Arcetri(意大利国家天体物理研究所阿切尔蒂天文台);INAF–Osservatorio Astrofisico di Catania(意大利国家天体物理研究所卡塔尼亚天文台);INAF–Osservatorio Astronomico di Capodimonte(意大利国家天体物理研究所卡波迪蒙特天文台);Nicolaus Copernicus Astronomical Center, Polish Academy of Sciences(波兰科学院尼古拉·哥白尼天文学中心);Institut für Astrophysik und Geophysik, Georg-August-Universität Göttingen(哥廷根大学天体物理与地球物理研究所);Tartu Observatory, University of Tartu(塔尔图大学塔尔图天文台);Institute of Astronomy, University of Cambridge(剑桥大学天文学研究所);University of Southampton(南安普顿大学);Institute for Computational Cosmology, Durham University(杜伦大学计算宇宙学研究所);Centre for Extragalactic Astronomy, Durham University(杜伦大学河外天文研究中心)
A New Collision Avoidance Fiber Assignment Algorithm for Robotic Fiber Positioners in Multi-Object Spectroscopy
Seoul National University(首尔大学);Korea Astronomy and Space Science Institute(韩国天文与空间科学研究院);Macquarie University(麦考瑞大学);Ajou University(亚洲大学);University of Arizona(亚利桑那大学);University of Science and Technology(科学技术大学)
Method on Using Shadow Altitude to Remove Geocoronal H$α$
The Chinese University of Hong Kong(香港中文大学);JC STEM Lab of Astronomical Instrumentation, The Chinese University of Hong Kong(香港中文大学天文仪器STEM实验室);CUHK Shenzhen Research Institute(香港中文大学深圳研究院);Institute for Astrophysics, School of Physics, Zhengzhou University(郑州大学物理学院天体物理研究所)
澳大利亚暗能量巡天(英语:Australian Dark Energy Survey,OzDES)是一个在英澳望远镜上进行的为期100晚的光谱巡天,使用的是光纤馈电的2度视场(2dF)摄谱仪。我们开发了一个新的红移应用程序Marz,与之前用于2dF红移光谱的Runz软件包相比,该应用程序具有更高的可用性、灵活性以及分析更广泛对象类型的能力。Marz是一个开源的、基于客户端的JavaScript网络应用程序,它提供了一个直观的界面和强大的自动匹配功能,可以对AAOmega摄谱仪产生的光谱进行高质量的光谱红移测量。该软件可以交互式运行或通过命令行运行,并且如果不可能符合当前的FITS文件标准,则可以轻松地适应其他仪器和管道。在幕后,Autoz互相关算法的修改版本用于将输入光谱与各种恒星和星系模板进行匹配,OzDES光谱的自动匹配性能从54%(Runz)提高到91%(Marz)。自动算法不能正确匹配的光谱可以很容易地通过循环自动结果、手动模板比较或标记光谱特征来手动红移。
Progress of the design of the 12-m optical, Wide-field Spectroscopic Telescope (WST)
Centre de Recherche Astrophysique de Lyon(里昂天体物理研究中心);Australian National University(澳大利亚国立大学);Science and Technology Facilities Council (STFC)(科学与技术设施委员会);Laboratoire Matériaux Avancés- IP2I, CNRS UCB Lyon(里昂UCB-CNRS先进材料实验室-IP2I);Istituto Nazionale di Astrofisica(意大利国家天体物理研究所);Queen Mary University London(伦敦玛丽女王大学);University College London(伦敦大学学院);NOVA optical infrared instrumentation group at ASTRON(荷兰ASTRON天文台的NOVA光学红外仪器组);Universität Wien(维也纳大学);Astralis - MQ AB(Astralis-MQ公司)