SQuIGG $\vec{L}$ E巡天：大质量z $\sim$ 0.6星爆后星系呈现出平坦的年龄变化
SQuIGG$\vec{L}$E Survey: Massive z$\sim$0.6 Post-Starburst Galaxies Exhibit Flat Age Gradients
摘要：
我们提出了双子座GMOS IFU观测六个大质量（$M_\star\geq10^{11} \ M_\odot$）A星占主导地位的后星爆星系在$z\sim0.6$。这些星系是SQuIGG $\vec{L}$ E巡天的子样本，该巡天从斯隆数字巡天光谱样本（DR 14）中选择中等红移的恒星爆发后光谱形状，表明它们最近关闭了恒星形成的主要时期。使用$Hδ_A$吸收作为恒星年龄的代理，我们约束五个星系有年轻的（$\sim 600$百万年）在所有半径的轻重量的年龄，并发现样本平均具有平坦的年龄梯度。我们研究的空间分布的质量加权属性，通过拟合我们的配置文件与玩具模型，包括一个年轻的，集中爆发叠加在一个较老的，扩展的人口。我们发现，星系平坦的$Hδ_A$配置文件是不一致的形成通过中央二级星暴。这意味着，负责关闭这一恒星形成的主要阶段的机制必须在整个星系中均匀地进行。
英文摘要：
We present Gemini GMOS IFU observations of six massive ($M_\star\geq10^{11} \ M_\odot$) A-star dominated post-starburst galaxies at $z\sim0.6$. These galaxies are a subsample of the SQuIGG$\vec{L}$E Survey, which selects intermediate-redshift post-starbursts from the Sloan Digital Sky Survey spectroscopic sample (DR14) with spectral shapes that indicate they have recently shut off their primary epoch of star formation. Using $Hδ_A$ absorption as a proxy for stellar age, we constrain five of the galaxies to have young ($\sim 600$ Myr) light-weighted ages at all radii and find that the sample on average has flat age gradients. We examine the spatial distribution of mass-weighted properties by fitting our profiles with a toy model including a young, centrally concentrated burst superimposed on an older, extended population. We find that galaxies with flat $Hδ_A$ profiles are inconsistent with formation via a central secondary starburst. This implies that the mechanism responsible for shutting off this dominant episode of star formation must have done so uniformly throughout the galaxy.
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