TY - JOUR
T1 - The supersonic project
T2 - To cool or not to cool supersonically induced gas objects (SIGOs)?
AU - Chiou, Yeou S.
AU - Naoz, Smadar
AU - Burkhart, Blakesley
AU - Marinacci, Federico
AU - Vogelsberger, Mark
N1 - Funding Information:
We thank the referee for useful comments and questions. The authors thank Volker Springel for access to AREPO. Y.S. C., S.N., B.B., F.M., and M.V. acknowledge the partial support of NASA grant No. 80NSSC20K0500 and the XSEDE AST180056 allocation as well as the Simons Foundation Center for Computational Astrophysics for computational resources. Y.S.C. thanks the partial support from a UCLA dissertation year fellowship. S.N. thanks Howard and Astrid Preston for their generous support. F.M. is supported by the Program “Rita Levi Montalcini” of the Italian MIUR. B.B. is grateful for the support from the Simons Foundation Center for Computational Astrophysics.
Publisher Copyright:
© 2021. The American Astronomical Society.
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Supersonically induced gas objects (SIGOs) primarily form in the early universe, outside of dark matter halos due to the presence of a relative stream velocity between baryons and dark matter. These structures may be the progenitors of globular clusters. Since SIGOs are made out of pristine gas, we investigate the effect of atomic cooling on their properties. We run a suite of simulations by using the moving-mesh code AREPO, with and without baryon dark matter relative velocity and with and without the effects of atomic cooling. We show that SIGO's density, temperature, and prolateness are determined by gravitational interactions rather than cooling. The cold gas fraction in SIGOs is much higher than that of dark matter halos. Specifically, we show that SIGO's characteristically low temperature and extremely high gas density forges a nurturing ground for the earliest star formation sites.
AB - Supersonically induced gas objects (SIGOs) primarily form in the early universe, outside of dark matter halos due to the presence of a relative stream velocity between baryons and dark matter. These structures may be the progenitors of globular clusters. Since SIGOs are made out of pristine gas, we investigate the effect of atomic cooling on their properties. We run a suite of simulations by using the moving-mesh code AREPO, with and without baryon dark matter relative velocity and with and without the effects of atomic cooling. We show that SIGO's density, temperature, and prolateness are determined by gravitational interactions rather than cooling. The cold gas fraction in SIGOs is much higher than that of dark matter halos. Specifically, we show that SIGO's characteristically low temperature and extremely high gas density forges a nurturing ground for the earliest star formation sites.
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U2 - 10.3847/1538-4357/abc88f
DO - 10.3847/1538-4357/abc88f
M3 - Article
AN - SCOPUS:85099189291
VL - 906
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - abc88f
ER -