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Supersonically Induced Gas Objects (SIGOs) primarily form in the earlyUniverse, outside of dark matter halos due to the presence of a relative streamvelocity between baryons and dark matter. These structures may be theprogenitors of globular clusters. Since SIGOs are made out of pristine gas, weinvestigate the effect of atomic cooling on their properties. We run a suite ofsimulations by using the moving-mesh code {\sc arepo}, with and withoutbaryon-dark matter relative velocity and with and without the effects of atomiccooling. We show that SIGO's density, temperature, and prolateness aredetermined by gravitational interactions rather than cooling. The cold gasfraction in SIGOs is much higher than that of dark matter halos. Specifically,we show that the SIGO's characteristic low temperature and extreme high gasdensity forges a nurturing ground for the earliest star formation sites.

The Supersonic Project: To cool or not to cool Supersonically Induced Gas Objects (SIGOs)?