THE VLT LEGA-C SPECTROSCOPIC SURVEY: THE PHYSICS OF GALAXIES AT A LOOKBACK TIME OF 7 Gyr
THE VLT LEGA-C SPECTROSCOPIC SURVEY: THE PHYSICS OF GALAXIES AT A LOOKBACK TIME OF 7 Gyr
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DOI：
10.3847/0067-0049/223/2/29
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发表时间：
2016-03
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通讯作者：
A. V. D. Wel;K. Noeske;R. Bezanson;C. Pacifici;A. Gallazzi;M. Franx;J. Muńoz-Mateos;E. Bell;G. Brammer;S. Charlot;Priscilla Chauké;I. Labbé;M. Maseda;A. Muzzin;H. Rix;D. Sobral;D. Sobral;J. V. D. Sande;P. V. Dokkum;Vivienne Wild;Christian Wolf
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文献类型：
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作者：
A. V. D. Wel;K. Noeske;R. Bezanson;C. Pacifici;A. Gallazzi;M. Franx;J. Muńoz-Mateos;E. Bell;G. Brammer;S. Charlot;Priscilla Chauké;I. Labbé;M. Maseda;A. Muzzin;H. Rix;D. Sobral;D. Sobral;J. V. D. Sande;P. V. Dokkum;Vivienne Wild;Christian Wolf
大型早期星系普查 (LEGA-C) 是对红移 z = 0.6 − 1.0、恒星质量 M * > 10 10 M ⊙ 的 ∼3200 K 波段选定星系的公共光谱调查，由 ESO 甚大望远镜上的 VIMOS 进行。该调查嵌入 COSMOS 场中（赤经 = 10h00；赤经 = + 2 度）。 20 小时长的积分产生高信噪比的连续光谱，揭示恒星群的年龄、金属丰度和速度色散。 LEGA-C 样本大小和深度的独特组合将使我们能够首次在大回溯时间内绘制不同类型星系和恒星形成活动的恒星含量图。观测于 2014 年 12 月开始，计划于 2018 年中期完成，并尽早发布光谱和增值产品数据。在本文中，我们介绍了科学案例、观测策略、数据缩减过程和数据产品的概述，并首次研究了 7 戈瑞前存在的星系结构和光谱特性之间的关系。
The Large Early Galaxy Census (LEGA-C) is a Public Spectroscopic Survey of ∼3200 K-band selected galaxies at redshifts z = 0.6 − 1.0 with stellar masses M * > 10 10 M ⊙ , conducted with VIMOS on ESO’s Very Large Telescope. The survey is embedded in the COSMOS field (R.A. = 10h00; decl . = + 2 deg ). The 20 hr long integrations produce high-signal-to-noise ratio continuum spectra that reveal ages, metallicities and velocity dispersions of the stellar populations. LEGA-C’s unique combination of sample size and depth will enable us for the first time to map the stellar content at large lookback time, across galaxies of different types and star formation activity. Observations started in 2014 December and are planned to be completed by mid 2018, with early data releases of the spectra and value-added products. In this paper we present the science case, the observing strategy, an overview of the data reduction process and data products, and a first look at the relationship between galaxy structure and spectral properties, as it existed 7 Gyr ago.