论文标题
恒星形成强度在Lyα中的重要性从绿色的豌豆星系和Lyman破裂星系类似物中逃脱
The Importance Of Star Formation Intensity In LYα Escape From Green Pea Galaxies And Lyman Break Galaxy Analogs
论文作者
论文摘要
我们研究了40个绿色豌豆星系和15个本地Lyman Break Galaxy类似物的紫外图像，以了解Ly $α$光子逃生与中央UV光度特性之间的关系。我们使用\ textIt {Hubble Space望远镜}的COS/NUV图像测量了中央250 PC区域（$ s _ {\ rm 250pc} $）的星形形成强度（SFI，单位面积的恒星形成率）。我们的样品绿豌豆的测量$ s _ {\ rm 250pc} $在2.3---46 $ M _ {\ odot} \ \ \ rm {year}^{ - 1}^{ - 1} \ \ \ \ rm {kpc^{ - 2}} $中，带有$ 15 m __________________ { \ rm {eY}^{ - 1} \ \ rm {kpc^{ - 2}} $和0.266 dex的标准偏差，形成相对狭窄的分布。 Lyman Break Galaxy类似物显示出$ s _ {\ rm 250pc} $（0.271 DEX）的狭窄分布，尽管较大的平均值为28 $ M _ {\ odot} \ \ \ \ \ \ \ \ rm {earl}^{ - 1} { - 1}}我们表明，虽然ly $α$同等宽度（ew（ly $α$））和ly $α$逃生分数（$ f^{lyα} _ {ecs} $）与central sfi（$ s _ {\ rm 250pc} $）的表面呈亮度呈上升效果，但与中央sfi（$ s _ {$ s _ {$ s _ {$ s _ {$ s _ { （$ s _ {\ rm 250pc}/m _ {\ rm star} $），相关系数（$ p $ - 值）为0.702（$ 1 \ times 10^{ - 8} $）和0.529（0.529）和0.529（$ 5 \ times 10^times 10^{ - 4} $）（ - $ $ $ $ $ aw（ly $ a $） $ f^{lyα} _ {esc} $。这些相关性表明，强烈的中央恒星形成可以在具有相对较浅的重力电势孔的星系中驱动银河系风，从而清除LY $α$光子的逃生通道。
We have studied ultraviolet images of 40 Green Pea galaxies and 15 local Lyman Break Galaxy Analogs to understand the relation between Ly$α$ photon escape and central UV photometric properties. We measured star formation intensity (SFI, star formation rate per unit area) from the central 250 pc region ($S_{\rm 250pc}$) using COS/NUV images from the \textit{Hubble Space Telescope}. The measured $S_{\rm 250pc}$ of our sample Green Peas ranges from 2.3--46 $M_{\odot} \ \rm{year}^{-1} \ \rm{kpc^{-2}}$, with a geometric mean of $15 M_{\odot} \ \rm{year}^{-1} \ \rm{kpc^{-2}}$ and a standard deviation of 0.266 dex, forming a relatively narrow distribution. The Lyman Break Galaxy Analogs show a similarly narrow distribution of $S_{\rm 250pc}$ (0.271 dex), though with a larger mean of 28 $M_{\odot} \ \rm{year}^{-1} \ \rm{kpc^{-2}}$. We show that while the Ly$α$ equivalent width (EW(Ly$α$)) and the Ly$α$ escape fraction ($f^{Lyα}_{esc}$) are not significantly correlated with the central SFI ($S_{\rm 250pc}$), both are positively correlated with the ratio of surface brightness to galaxy stellar mass ($S_{\rm 250pc}/M_{\rm star}$), with correlation coefficients ($p$-values) of 0.702 ($1\times 10^{-8}$) and 0.529 ($5\times 10^{-4}$) with EW(Ly$α$) and $f^{Lyα}_{esc}$, respectively. These correlations suggest a scenario where intense central star formation can drive a galactic wind in galaxies with relatively shallow gravitational potential wells, thus clearing channels for the escape of Ly$α$ photons.
