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We present the highest redshift detections of resolved Lyman alpha emission,using Hubble Space Telescope/ACS F658N narrowband-imaging data taken inparallel with the Wide Field Camera 3 Early Release Science program in theGOODS CDF-S. We detect Lyman alpha emission from three spectroscopicallyconfirmed z = 4.4 Lyman alpha emitting galaxies (LAEs), more than doubling thesample of LAEs with resolved Lyman alpha emission. Comparing the lightdistribution between the rest-frame ultraviolet continuum and narrowbandimages, we investigate the escape of Lyman alpha photons at high redshift.While our data do not support a positional offset between the Lyman alpha andrest-frame ultraviolet (UV) continuum emission, the half-light radii in two outof the three galaxies are significantly larger in Lyman alpha than in therest-frame UV continuum. This result is confirmed when comparing object sizesin a stack of all objects in both bands. Additionally, the narrowband fluxdetected with HST is significantly less than observed in similar filters fromthe ground. These results together imply that the Lyman alpha emission is notstrictly confined to its indigenous star-forming regions. Rather, the Lymanalpha emission is more extended, with the missing HST flux likely existing in adiffuse outer halo. This suggests that the radiative transfer of Lyman alphaphotons in high-redshift LAEs is complicated, with the interstellar-mediumgeometry and/or outflows playing a significant role in galaxies at theseredshifts.

Hubble Space Telescope Imaging of Lyman Alpha Emission at z=4.4