TY - JOUR
T1 - H2Cooling and Gravitational Collapse of Supersonically Induced Gas Objects
AU - Nakazato, Yurina
AU - Chiaki, Gen
AU - Yoshida, Naoki
AU - Naoz, Smadar
AU - Lake, William
AU - Chiou, Yeou S.
N1 - Funding Information:
The authors thank the anonymous referee for providing us with many insightful comments. Y.N. would like to thank Shingo Hirano for fruitful discussions. Numerical computations were carried out on Cray XC50 and PC cluster at Center for Computational Astrophysics, National Astronomical Observatory of Japan. N.Y. acknowledges financial support from JST AIP Acceleration Research JP20317829. S.N., W.L., and Y.S.C. thank the support of NASA grant No. 80NSSC20K0500. S.N. thanks Howard and Astrid Preston for their generous support.
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/3/1
Y1 - 2022/3/1
N2 - We study the formation and gravitational collapse of supersonically induced gas objects (SIGOs) in the early universe. We run cosmological hydrodynamics simulations of SIGOs, including relative streaming motions between baryons and dark matter. Our simulations also follow nonequilibrium chemistry and molecular hydrogen cooling in primordial gas clouds. A number of SIGOs are formed in the run with fast-streaming motions of 2 times the rms of the cosmological velocity fluctuations. We identify a particular gas cloud that condensates by H2 cooling without being hosted by a dark matter halo. The SIGO remains outside the virial radius of its closest halo, and it becomes Jeans unstable when the central gas-particle density reaches ∼100 cm-3 with a temperature of ∼200 K. The corresponding Jeans mass is ∼105 M, and thus the formation of primordial stars or a star cluster is expected in the SIGO.
AB - We study the formation and gravitational collapse of supersonically induced gas objects (SIGOs) in the early universe. We run cosmological hydrodynamics simulations of SIGOs, including relative streaming motions between baryons and dark matter. Our simulations also follow nonequilibrium chemistry and molecular hydrogen cooling in primordial gas clouds. A number of SIGOs are formed in the run with fast-streaming motions of 2 times the rms of the cosmological velocity fluctuations. We identify a particular gas cloud that condensates by H2 cooling without being hosted by a dark matter halo. The SIGO remains outside the virial radius of its closest halo, and it becomes Jeans unstable when the central gas-particle density reaches ∼100 cm-3 with a temperature of ∼200 K. The corresponding Jeans mass is ∼105 M, and thus the formation of primordial stars or a star cluster is expected in the SIGO.
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U2 - 10.3847/2041-8213/ac573e
DO - 10.3847/2041-8213/ac573e
M3 - Article
AN - SCOPUS:85126629846
SN - 2041-8205
VL - 927
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L12
ER -