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It is commonly believed that the earliest stages of star formation in the Universe were self‐regulated by global radiation backgrounds – either by the ultraviolet (UV) Lyman–Werner (LW) photons emitted by the first stars (directly photodissociating H2), or by the X‐rays produced by accretion on to the black hole (BH) remnants of these stars (heating the gas but catalysing H2 formation). Recent studies...
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