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SDSS-IV MaNGA: Observational Evidence of a Density-bounded Region in a Lyα Emitter.
- Source :
-
Astrophysical Journal . 1/10/2022, Vol. 924 Issue 2, p1-11. 11p. - Publication Year :
- 2022
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Abstract
- Using integral field unit spectroscopy, we present here the spatially resolved morphologies of [S ii ]λ6717,6731/Hα and [S ii ]λ6717,6731/[O iii ]λ5007 emission line ratios for the first time in a blueberry Lyα emitter (BBLAE) at z ∼ 0.047. Our derived morphologies show that the extreme starburst region of the BBLAE, populated by young (≤10 Myr), massive Wolf–Rayet stars, is [S ii ] deficient, while the rest of the galaxy is [S ii ] enhanced. We infer that the extreme starburst region is density-bounded (i.e., optically thin to ionizing photons), and the rest of the galaxy is ionization-bounded, indicating a Blister-type morphology. We find that the previously reported small escape fraction (10%) of Lyα photons is from our identified density-bounded H ii region of the BBLAE. This escape fraction is likely constrained by a porous dust distribution. We further report a moderate correlation between [S ii ] deficiency and inferred Lyman continuum (LyC) escape fraction using a sample of confirmed LyC leakers studied in the literature, including the BBLAE studied here. The observed correlation also reveals its dependency on the stellar mass and gas-phase metallicity of the leaky galaxies. Finally, the future scope and implications of our work are discussed in detail. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 0004637X
- Volume :
- 924
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Astrophysical Journal
- Publication Type :
- Academic Journal
- Accession number :
- 154944678
- Full Text :
- https://doi.org/10.3847/1538-4357/ac33a5