Green Pea Galaxies Reveal Secrets of Ly$\alpha$ Escape
Huan Yang, Sangeeta Malhotra, Max Gronke, James E. Rhoads, Mark, Dijkstra, Anne Jaskot, Zhenya Zheng, Junxian Wang

TL;DR
This study analyzes Ly$ ext{alpha}$ spectra of nearby Green Pea galaxies to understand the factors influencing Ly$ ext{alpha}$ escape, revealing that low HI column density and metallicity are key for Ly$ ext{alpha}$ emission.
Contribution
It provides the first detailed analysis linking Ly$ ext{alpha}$ escape fractions to HI column density, metallicity, and dust in Green Pea galaxies using radiative transfer models.
Findings
Ly$ ext{alpha}$ escape fractions range from 1.4% to 67%.
Low HI column density correlates with higher Ly$ ext{alpha}$ escape.
Metallicity and dust influence Ly$ ext{alpha}$ escape efficiency.
Abstract
We analyze archival Ly spectra of 12 "Green Pea" galaxies observed with the Hubble Space Telescope, model their Ly profiles with radiative transfer models, and explore the dependence of Ly escape fraction on various properties. Green Pea galaxies are nearby compact starburst galaxies with [OIII]5007 equivalent widths of hundreds of \AA. All 12 Green Pea galaxies in our sample show Ly lines in emission, with a Ly equivalent width distribution similar to high redshift Ly emitters. Combining the optical and UV spectra of Green Pea galaxies, we estimate their Ly escape fractions and find correlations between Ly escape fraction and kinematic features of Ly profiles. The escape fraction of Ly in these galaxies ranges from 1.4% to 67%. We also find that the Ly escape fraction depends strongly on…
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Taxonomy
TopicsTransgenic Plants and Applications · Biochemical and Structural Characterization · Plant tissue culture and regeneration
