I couldn't find any references to the halos except in ATM. So...
Scientists detect our galaxy’s double halo
I'm not sure how noteworthy this is...but it's interesting to me, and I'm sure there are those here that can comment on it.
I did find the illustration useful
not.
Quote:
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The red plus symbols represent stars and the brown burst-like symbols are star clusters.
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I think there may be a few more than that...