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Correct me if I am wrong, and I haven't read their paper, only media reports, but a galaxy without stars does not strike me in any sense as being a galaxy, merely an intergalactic cloud of hydrogen. This Hydrogen would be neutral, I assume, as there is no ionising radiation to create HII regions.
If it's a galaxy, they can keep it. If it aint in the Hubble sequence, it just cant be a galaxy.
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