The Connection Between Galactic Outflows and the Escape of Ionizing Photons

Abstract We analyze spectra of a gravitationally lensed galaxy, known as the Sunburst Arc, that is leaking ionizing photons, also Lyman continuum (LyC). Magnification from gravitational lensing permits galaxy to be spatially resolved into one region leaks photons and several do not. Rest-frame UV optical Magellan target 10 different regions along including six multiple images LyC four not show emission. The rest-frame photon emitting reveal blueshifted (Δ V = 27 km s −1 ) broad emission component (FWHM 327 ), comprising 55% total [O iii ] line flux, in addition narrow 112 suggesting presence strong highly ionized gas outflows. This consistent with high-velocity outflow inferred spectra. In contrast, less prominent nonleaking regions, ∼26% flux. high-ionization absorption lines are both leaker nonleaker, but low-ionization very weak leaker, line-of-sight leaker. Analyses stellar wind features population considerably younger (∼3 Myr) than (∼12 Myr), emphasizing feedback young stars may play an important role escape.