Constraints on the Lyman Continuum Escape from Low-mass Lensed Galaxies at 1.3 ≤ z ≤ 3.0
arxiv(2024)
摘要
Low-mass galaxies can significantly contribute to reionization due to their
potentially high Lyman continuum (LyC) escape fraction and relatively high
space density. We present a constraint on the LyC escape fraction from low-mass
galaxies at z = 1.3 - 3.0. We obtained rest-frame UV continuum imaging with the
ACS/SBC and the WFC3/UVIS from the Hubble Space Telescope for eight
strongly-lensed galaxies that were identified in the Sloan Giant Arc Survey
(SGAS) and the Cluster Lensing And Supernova survey with Hubble (CLASH). The
targeted galaxies were selected to be spectroscopically confirmed, highly
magnified, and blue in their UV spectral shapes (β<-1.7). Our targets
include intrinsically low luminosity galaxies down to a magnification-corrected
absolute UV magnitude of M_ UV∼-14. We perform custom-defined
aperture photometry to place the most reliable upper limits of LyC escape from
our sample. From our observations, we report no significant (>2σ)
detections of LyC fluxes, placing 1σ upper limits on the absolute LyC
escape fractions of 3 - 15
increased escape fractions of LyC photons from intrinsically UV faint sources.
Considering the highly anisotropic geometry of LyC escape, increasing the
sample size of faint galaxies in future LyC observations is crucial.
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