Fig. 1.
Serendipitous discovery of a bright Lyα emitting region, HLock01-LAB. Top: Subaru I-band imaging showing the locations of the OSIRIS long slits on the sky (dashed lines) used in the analysis of the bright gravitational lens HLock01 in Marques-Chaves et al. (2018) (top left corner). The approximate positions where the bright Lyα emission was serendipitously detected are marked with circles. Bottom: spectra encompassing the region of the Lyα emission detected in both slits. The location of the two slits is shown in the top panel. The dashed line shows the transmission of the SHARDS U534/17 medium-band filter.
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