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arXiv 2307.03096astro-ph.GA
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HETDEX公共源目录1——叠加5万个莱曼阿尔法发射体

HETDEX Public Source Catalog 1 -- Stacking 50K Lyman Alpha Emitters

Dustin Davis, Karl Gebhardt, Erin Mentuch Cooper, William P. Bowman, Barbara Garcia Castanheira, John Chisholm, Robin Ciardullo, Maximilian Fabricius, Daniel J.… 展开作者

Dustin Davis, Karl Gebhardt, Erin Mentuch Cooper, William P. Bowman, Barbara Garcia Castanheira, John Chisholm, Robin Ciardullo, Maximilian Fabricius, Daniel J. Farrow, Steven L. Finkelstein, Caryl Gronwall, Eric Gawiser, Gary J. Hill, Ulrich Hopp, Lindsay R. House, Donghui Jeong, Wolfram Kollatschny, Eiichiro Komatsu, Chenxu Liu, Maja Lujan Niemeyer, Alberto Saldana-Lopez, Shun Saito, Donald P. Schneider, Jan Snigula, Sarah Tuttle, Laurel H. Weiss, Lutz Wisotzki, Gregory Zeimann

AI总结:

本文通过叠加HETDEX首次公开数据中5万个莱曼阿尔法发射体光谱,揭示了平均LAE星系具有年轻、贫金属、强发射及潜在电离辐射泄漏等集合特征。

摘要:

我们描述了在HETDEX巡天的首次公开数据发布,即HETDEX Public Source Catalog 1(Mentuch Cooper et al. 2023)中发现的 $1.9 < z < 3.5$ 莱曼阿尔法发射体(LAEs)的集合属性。叠加低分辨率($R \sim$ 800)光谱极大地提高了信噪比,揭示了原本被噪声掩盖的光谱特征,并且我们证明叠加光谱代表了该集合中平均成员的特征。基于流量限制和Ly$α$信噪比限制的5万个HETDEX LAEs的叠加显示,集合双权重“平均” $z \sim 2.6$ LAE 是一个蓝色(紫外连续谱斜率 $\sim -2.4$ 且 E(B-V) $< 0.1$)、中等亮度(M$_{\text{UV}} \sim -19.7$)的恒星形成星系,具有强烈的Ly$α$发射(log $L_{Lyα}$ $\sim$ 42.8 和 $W_λ$(Ly$α$) $\sim$ 114Å),以及可能显著的电离辐射泄漏。静止系紫外光由一个年轻且贫金属的恒星族群主导,其平均年龄为5-15 Myr,金属丰度为0.2-0.3 Z$_{\odot}$。

英文摘要:

We describe the ensemble properties of the $1.9 < z < 3.5$ Lyman Alpha Emitters (LAEs) found in the HETDEX survey's first public data release, HETDEX Public Source Catalog 1 (Mentuch Cooper et al. 2023). Stacking the low-resolution ($R \sim$ 800) spectra greatly increases the signal-to-noise ratio, revealing spectral features otherwise hidden by noise, and we show that the stacked spectrum is representative of an average member of the set. The flux limited, Ly$α$ signal-to-noise ratio restricted stack of 50K HETDEX LAEs shows the ensemble biweight ``average" $z \sim 2.6$ LAE to be a blue (UV continuum slope $\sim -2.4$ and E(B-V) $< 0.1$), moderately bright (M$_{\text{UV}} \sim -19.7$) star forming galaxy with strong Ly$α$ emission (log $L_{Lyα}$ $\sim$ 42.8 and $W_λ$(Ly$α$) $\sim$ 114Å), and potentially significant leakage of ionizing radiation. The restframe UV light is dominated by a young, metal poor stellar population with an average age 5-15 Myr and metallicity of 0.2-0.3 Z$_{\odot}$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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