FIRST RESULTS FROM THE 3D-HST SURVEY: THE STRIKING DIVERSITY OF MASSIVE GALAXIES AT z > 1
FIRST RESULTS FROM THE 3D-HST SURVEY: THE STRIKING DIVERSITY OF MASSIVE GALAXIES AT z > 1
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3D-HST 巡天的初步结果： z > 1 时大质量星系的惊人多样性
DOI：
10.1088/2041-8205/743/1/l15
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
Anna L. Williams
中科院分区：
文献类型：
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作者：
P. V. van Dokkum;G. Brammer;M. Fumagalli;E. Nelson;M. Franx;H. Rix;M. Kriek;R. Skelton;S. Patel;K. Schmidt;R. Bezanson;F. Bian;E. da Cunha;D. Erb;Xiaohui Fan;N. F. Förster Schreiber;G. Illingworth;I. Labbé;B. Lundgren;D. Magee;D. Marchesini;P. McCarthy;A. Muzzin;R. Quadri;C. Steidel;T. Tal;D. Wake;K. Whitaker;Anna L. Williams
我们目前的第一个结果，从3D-HST计划，近红外光谱调查与宽视场相机3（WFC 3）的HST。我们用3D-HST光谱测量了在COSMOS、GOODS和AEGIS场中34个星系的红移和Hα等效宽度（EWHα）< 1.5 with Mstar >。我们发现，在这个时期，相当一部分大质量星系正在以很高的速度形成恒星：EWHα >10 μ m的星系比例为59%，而在z = 0.1的类似质量的斯隆数字巡天星系中，这一比例为10%。具有弱Hα发射的Galerkin显示出典型的2-4 Gyr年龄恒星群体的吸收线。从WFC 3 F140 W的影像资料中得到的星系结构参数与Hα的存在相关;静止星系是致密的，具有高的Sérsic指数和高的速度色散，而恒星形成星系是典型的大型双臂螺旋星系，具有低的Sérsic指数。其中一些恒星形成星系可能是最大质量的S 0和Sa星系的祖先。我们的研究结果挑战的想法，星系在固定的质量形成一个均匀的人口在其属性的小分散。相反，我们发现大质量星系在z > 1时形成了高度多样性的种群，与局部宇宙形成了鲜明的对比。
We present first results from the 3D-HST program, a near-IR spectroscopic survey performed with the Wide Field Camera 3 (WFC3) on the HST. We have used 3D-HST spectra to measure redshifts and Hα equivalent widths (EWHα) for a complete, stellar mass-limited sample of 34 galaxies at 1 < z < 1.5 with Mstar > 1011 M☉ in the COSMOS, GOODS, and AEGIS fields. We find that a substantial fraction of massive galaxies at this epoch are forming stars at a high rate: the fraction of galaxies with EWHα >10 Å is 59%, compared to 10% among Sloan Digital Sky Survey galaxies of similar masses at z = 0.1. Galaxies with weak Hα emission show absorption lines typical of 2–4 Gyr old stellar populations. The structural parameters of the galaxies, derived from the associated WFC3 F140W imaging data, correlate with the presence of Hα; quiescent galaxies are compact with high Sérsic index and high inferred velocity dispersion, whereas star-forming galaxies are typically large two-armed spiral galaxies, with low Sérsic index. Some of these star-forming galaxies might be progenitors of the most massive S0 and Sa galaxies. Our results challenge the idea that galaxies at fixed mass form a homogeneous population with small scatter in their properties. Instead, we find that massive galaxies form a highly diverse population at z > 1, in marked contrast to the local universe.
WFC3 红外光谱平行 (WISP) 调查
DOI：
10.1088/0004-637x/723/1/104
发表时间：
2010
期刊：
The Astrophysical Journal
影响因子：
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作者：
Atek H
通讯作者：
Atek H