Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: William Lake, Smadar Naoz, Federico Marinacci, Blakesley Burkhart, Mark Vogelsberger
| Summary:
The formation mechanism of globular clusters (GCs) has long been debated by
astronomers. It was recently proposed that Supersonically Induced Gas Objects
(SIGOs), which formed in the early Universe due to the supersonic relative
motion of baryons and dark matter at recombination, could be the progenitors of
early globular clusters. In order to become GCs, SIGOs must form stars
relatively efficiently despite forming outside of dark matter halos. We
investigate the potential for star formation in SIGOs using cosmological
hydrodynamic simulations, including the aforementioned relative motions of
baryons and dark matter, molecular hydrogen cooling in primordial gas clouds,
and including explicit star formation. We find that SIGOs do form stars and
that the nascent star clusters formed through this process are accreted by dark
matter halos on short timescales (a few hundreds of Myr). Thus, SIGOs may be
found as intact substructures within these halos, analogous to many present-day
GCs. From this result, we conclude that SIGOs are capable of forming star
clusters with similar properties to globular clusters in the early Universe and
we discuss their detectablity by upcoming JWST surveys.
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