(targeted highest red-shift galaxies showing little or no metal)
First galaxies are targets of some searches, e.g., Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey,
typically searching in near infrared.
The goal is to find early galaxies with ever higher redshifts,
and with little or no metal. Candidates are in the z=7-to-12 range.
Deep photometric survey images are scanned,
e.g., for dropouts in the images taken through the
To some degree, observation has overtaken theory as galaxy formation
theories don't create galaxies so early after the Big Bang as
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