The formation of Supersonically Induced Gas Objects (SIGOs) with H2 cooling. Issue Volume 16:Issue S362(2020) (June 2020)

• Record Type: Journal Article
• Authors: Nakazato, Yurina; Chiaki, Gen; Yoshida, Naoki; Naoz, Smadar; Lake, William; Yeou, Chiou
• Editors: Bisikalo, Dmitry; Wiebe, Dmitri; Boily, Christian
• Is Part Of: Proceedings of the International Astronomical Union. Volume 16:Issue S362(2020)
• Page Start: 45
• Page End: 50
• Publication Date: 2020-06
• Subjects: cosmology: theory -- methods: numerical -- galaxies: high-redshift -- stars: Population III; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921322001284
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: During the recombination of the universe, supersonic relative motion between baryons and dark matter (DM) generally existed. In the presence of such streaming motions, gas clumps can collapse outside of virial radii of their closest dark matter halos. Such baryon dominant objects are thought to be self-gravitating and are called supersonically induced gas objects; SIGOs. We perform three-dimensional hydrodynamical simulations by including H2 chemical reactions and stream velocity and follow SIGO's formation from z = 200 to z = 25. SIGOs can be formed under the influence of stream velocity, and cooling is effective in contracting gas clouds. We follow its further evolution with higher resolution. We find that there are SIGOs which become Jeans unstable outside of the virial radius of the closest DM halos. Those SIGOs are gravitationally unstable and trigger star formation.