论文标题
Squigg $ \ vec {l} $ E调查：大型Z $ \ SIM $ 0.6 Starburst星系展示平坦时代梯度
SQuIGG$\vec{L}$E Survey: Massive z$\sim$0.6 Post-Starburst Galaxies Exhibit Flat Age Gradients
论文作者
论文摘要
我们介绍了六个巨大（$ m_ \ star \ geq10^{11}} \ m_ \ odot $）的Gemini Gmos IFU观察结果A-Star主导的恒星星系占据了$ Z \ sim0.6 $。这些星系是Squigg $ \ vec {l} $ E调查的子样本，它从Sloan Digital Sky Sumpertroscopic样品（DR14）中选择了中间雷德希夫特·季伯，其光谱形状表明他们最近关闭了其主要星星形成的主要阶段。使用$Hδ_A$吸收作为恒星年龄的代理，我们将其中的五个星系限制为年轻的（$ \ sim 600 $ MYR）轻度加权年龄，并发现该样品平均具有平坦的年龄梯度。我们通过将概况与包括年轻的，集中浓缩的爆发叠加在较老的，扩大的人群中的玩具模型来检查大量加权性质的空间分布。我们发现，具有flat $HΔ_A$轮廓的星系与通过中央二次Starburst的形成不一致。这意味着负责关闭恒星形成的主要发作的机制必须在整个银河系中如此统一。
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.
