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Hubble captures multiply-imaged ionizing radiation from strongly lensed galaxy at z=2.4
T. Emil Rivera-Thorsen ; Håkon Dahle ; John Chisholm ; Michael K. Florian ; Max Gronke ; Michael D. Gladders ; Jane R. Rigby ; Guillaume Mahler ; Keren Sharon ; Matthew Bayliss ;
Date:	17 Apr 2019
Abstract:	The early Universe was ionized by hard ultraviolet radiation from hot, young stars in the first galaxies. These galaxies contain absorbing neutral Hydrogen which must be configured favorably to allow ionizing escape; only a few dozen cases have been detected at any redshift. Here we present Hubble observations of the brightest known lensed galaxy, the Sunburst Arc, revealing bright, multiply-imaged escape from a compact stellar region through a narrow channel in an optically thick gas. Gravitational lensing magnification has allowed the clearest view yet of how ionizing photons escape galaxies, providing a unique window to the last major phase transition of the Universe, the epoch of re-ionization. The multiple sight lines to the source probe absorption by intergalactic neutral Hydrogen on unprecedentedly small scales.
Source:	arXiv, 1904.8186
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