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The discovery of a large cloud of ionized gas associated with the high-redshift radio source 3C 326.1 is reported; this cloud is the best candidate for a protogalaxy yet observed. The radio source is a small double without a detectable core which is encompassed by a cloud of ionized gas of approximately 100 kpc diameter and a redshift of 1.825. Two faint blue objects are located on the periphery of the cloud along with some very faint, extremely diffuse blue objects roughly coincident with the brightest regions of the cloud. The Ly-alpha emission from the cloud appears to have a large intrinsic width. Weak extended emission from semiforbidden C II and semiforbidden C III is seen, but C IV emission is not detected. The large equivalent width of Ly-alpha and the relative strengths of the carbon lines are consistent with H II region-type photoionization.
McCarthy et al. (Sat,) studied this question.
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