The Magellan Evolution of Galaxies Spectroscopic and Ultraviolet Reference Atlas (MegaSaura). II. Stacked Spectra
The Magellan Evolution of Galaxies Spectroscopic and Ultraviolet Reference Atlas (MegaSaura). II. Stacked Spectra
复制标题
麦哲伦星系演化光谱和紫外线参考图集（MegaSaura）。
DOI：
10.3847/1538-4357/aaa2fc
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
A. Acharyya
中科院分区：
文献类型：
--
作者：
J. Rigby;M. Bayliss;J. Chisholm;R. Bordoloi;K. Sharon;M. Gladders;T. Johnson;R. Paterno;E. Wuyts;H. Dahle;A. Acharyya
我们堆叠的N = 14高度放大的引力透镜星系在红移的休息帧紫外光谱。由此产生的新的合成跨度为100 km，峰值信噪比（S/N）为103/光谱分辨率元素（100 km s−1）。这是迄今为止已发表的z ≥ 2-3星系的最高信噪比、最高光谱分辨率的合成光谱。该复合材料揭示了许多微弱的星云发射线和恒星光球吸收线，可以作为新的物理诊断，特别是在高红移与詹姆斯韦伯太空望远镜（JWST）。我们报告等效宽度，以帮助建议和解释JWST光谱。我们研究的速度剖面的强吸收功能的复合材料，并在一个匹配的复合COS/HST星系光谱。我们发现，在速度分布和显着的相似性，这表明类似的物理过程控制整个宇宙时间的流出。虽然最大流出速度强烈地依赖于电离势，但吸收加权平均速度不依赖于电离势。因此，大量的高电离吸收跟踪低电离气体，并有一个额外的蓝移吸收尾部延伸到至少−2000 km s−1。我们解释这个尾巴所产生的恒星风和光球的大质量恒星。Starburst 99模型能够复制这种高速吸收尾。然而，这些理论模型很难再现几个光球的吸收功能，表明需要改进，以匹配观测的恒星形成星系的大质量恒星内容的限制。我们公开了合成光谱。
We stack the rest-frame ultraviolet spectra of N = 14 highly magnified gravitationally lensed galaxies at redshifts . The resulting new composite spans Å, with a peak signal-to-noise ratio (S/N) of 103 per spectral resolution element (∼100 km s−1). It is the highest S/N, highest spectral resolution composite spectrum of z ∼ 2–3 galaxies yet published. The composite reveals numerous weak nebular emission lines and stellar photospheric absorption lines that can serve as new physical diagnostics, particularly at high redshift with the James Webb Space Telescope (JWST). We report equivalent widths to aid in proposing for and interpreting JWST spectra. We examine the velocity profiles of strong absorption features in the composite, and in a matched composite of COS/HST galaxy spectra. We find remarkable similarity in the velocity profiles at and , suggesting that similar physical processes control the outflows across cosmic time. While the maximum outflow velocity depends strongly on ionization potential, the absorption-weighted mean velocity does not. As such, the bulk of the high-ionization absorption traces the low-ionization gas, with an additional blueshifted absorption tail extending to at least −2000 km s−1. We interpret this tail as arising from the stellar wind and photospheres of massive stars. Starburst99 models are able to replicate this high-velocity absorption tail. However, these theoretical models poorly reproduce several of the photospheric absorption features, indicating that improvements are needed to match observational constraints on the massive stellar content of star-forming galaxies at . We publicly release our composite spectra.
大卫·H·德雷斯勒，1941-2014。
影响因子：
30.8
作者：
Potter,Huntington
通讯作者：
Potter,Huntington