S316p.82 — Lyman Continuum Leakage in the Local Universe

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Claus Leitherer1, Svea Hernandez3, Janice Lee1, Sally Oey2

Institution(s): 1. Space Telescope Science Institute, 2. Univ. of Michigan, 3. Univ. of Nijmegen

Star-forming galaxies are viable candidates for providing the ionizing photon supply accounting for the reionization of the early universe. However, direct determination of the fraction of ionizing photons that can escape the optically thick galaxy ISM is challenging. I will discuss Lyman continuum observations of a sample of massive young star clusters in local galaxies which take advantage of a new capability of HST's Cosmic Origins Spectrograph. The derived photon leakages are compared to values found at high redshift and discussed in the context of cosmological models.