The Importance Of Star Formation Intensity In LYα Escape From Green Pea Galaxies And Lyman Break Galaxy Analogs

Abstract

We have studied ultraviolet images of 40 Green Pea galaxies and 15 local Lyman Break Galaxy Analogs to understand the relation between Ly$\alpha$ 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 ($S_{250pc}$) using COS/NUV images from the \textit{Hubble Space Telescope}. The measured $S_{250pc}$ of our sample Green Peas ranges from 2.3--46 $M_{\odot }{\mathrm{year}}^{-1}\mathrm{kp}{\mathrm{c}}^{-2}$, with a geometric mean of $15M_{\odot }{\mathrm{year}}^{-1}\mathrm{kp}{\mathrm{c}}^{-2}$ and a standard deviation of 0.266 dex, forming a relatively narrow distribution. The Lyman Break Galaxy Analogs show a similarly narrow distribution of $S_{250pc}$ (0.271 dex), though with a larger mean of 28 $M_{\odot }{\mathrm{year}}^{-1}\mathrm{kp}{\mathrm{c}}^{-2}$. We show that while the Ly$\alpha$ equivalent width (EW(Ly$\alpha$)) and the Ly$\alpha$ escape fraction ($f_{esc}^{Ly\alpha }$) are not significantly correlated with the central SFI ($S_{250pc}$), both are positively correlated with the ratio of surface brightness to galaxy stellar mass ($S_{250pc}/M_{\mathrm{star}}$), with correlation coefficients ($p$-values) of 0.702 ($1\times 10^{-8}$) and 0.529 ($5\times 10^{-4}$) with EW(Ly$\alpha$) and $f_{esc}^{Ly\alpha }$, 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$\alpha$ photons.

arXiv comment8 pages, 3 figures, 2 tables. Accepted for publication in ApJ

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