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29 March 2024
 
  » arxiv » 1511.1998

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The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
Michael J. Rutkowski ; Claudia Scarlata ; Francesco Haardt ; Brian Siana ; Alaina Henry ; Marc Rafelski ; Matthew Hayes ; Mara Salvato ; Anthony J. Pahl ; Vihang Mehta ; Melanie Beck ; Matthew Malkan ; Harry I. Teplitz ;
Date 6 Nov 2015
AbstractTo date no direct detection of Lyman continuum emission has been measured for intermediate--redshift z~1 star-forming galaxies . We combine HST grism spectroscopy with GALEX UV and ground--based optical imaging to extend the search for escaping Lyman continuum to a large (~600) sample of z~1 low-mass, moderately star-forming galaxies selected initially on H$alpha$ emission. The characteristic escape fraction of LyC from SFGs that populate this parameter space remains weakly constrained by previous surveys, but these faint SFGs are assumed to play a significant role in the reionization of neutral hydrogen in the intergalactic medium (IGM) at high redshift (z>6). We do not make an unambiguous detection of escaping LyC radiation from this $zsim1$ sample, individual non--detections to constrain the absolute Lyman continuum escape fraction, $f_{esc}$<2.1% (3$sigma$). We measure upper limits of $f_{esc}$<9.6% from a sample of SFGs selected on high H$alpha$ equivalent width (EW>200AA), which are thought to be close analogs of high redshift sources of reionization. For reference, we also present an emissivity--weighted escape fraction which is useful as a measurement of the general contribution of the SFGs to the z~1 ionizing UV background. In the discussion, we consider the implications of these intermediate redshift constraints for the re--ionization of hydrogen in the intergalactic medium at high (z>6) redshift. If the escape fraction of SFGs increases with redshift or an unobserved population of faint (M$_{UV}$<-13 AB) SFGs with $f_{esc}$>3% contributes significantly, reionization by SFGs is marginally consistent with independent observations from Planck.
Source arXiv, 1511.1998
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