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The Low-Redshift Lyman Continuum Survey: The Roles of Stellar Feedback and ISM Geometry in LyC Escape
Sophia R. Flury, Anne E. Jaskot, Alberto Saldana-Lopez, M. S. Oey, John Chisholm, Ricardo Amorín, Omkar Bait, Sanchayeeta Borthakur, Cody Carr, Henry C. Ferguson, Mauro Giavalisco, Matthew Hayes, Timothy Heckman, Alaina Henry, Zhiyuan Ji, Lena Komarova, Floriane Leclercq, Alexandra Le Reste, Stephan McCandliss, Rui Marques-Chaves, Göran Östlin, Laura Pentericci, Swara Ravindranath, Michael Rutkowski, Claudia Scarlata, Daniel Schaerer, Trinh Thuan, Maxime Trebitsch, Eros Vanzella, Anne Verhamme, Bingjie Wang, Gábor Worseck, Xinfeng Xu
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One of the fundamental questions of cosmology is the origin and mechanism(s) responsible for the reionization of the Universe beyond z∼6. To address this question, many studies over the past decade have focused on local (z∼0.3) galaxies which leak ionizing radiation (Lyman continuum or LyC). However, line-of-sight effects and data quality have prohibited deeper insight into the nature of LyC escape. To circumvent these limitations, we analyze stacks of a consolidated sample of {\it HST}/COS observations of the LyC in 89 galaxies at z∼0.3. From fitting of the continuum, we obtain information about the underlying stellar populations and neutral ISM geometry. We find that most LyC non-detections are not leaking appreciable LyC (f_(esc)^(LyC)<1\%) but also that exceptional cases point to spatial variations in the LyC escape fraction f_(esc)^(LyC). Stellar populations younger than 3 Myr lead to an increase in ionizing feedback, which in turn increases the isotropy of LyC escape. Moreover, mechanical feedback from supernovae in 8-10 Myr stellar populations is important for anisotropic gas distributions needed for LyC escape. While mechanical feedback is necessary for any LyC escape, high f_(esc)^(LyC) (>5\%) also requires a confluence of young stars and ionizing feedback. A two-stage burst of star formation could facilitate this optimal LyC escape scenario.
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