Formation of the first star clusters and massive star binaries by fragmentation of filamentary primordial gas clouds

Understand

We perform a set of cosmological simulations of early structure formation with incorporating baryonic streaming motions.

• We present a case where a significantly elongated gas cloud with $\sim\!10^4\,$solar masses (${\rm M_\odot}$) is formed in a pre-galactic ($\sim\!10^7\,{\rm M_\odot}$) dark halo.
• The gas streaming into the halo compresses and heats the massive filamentary cloud to a temperature of $\sim\!10,000\,$Kelvin.
• The gas cloud cools rapidly by atomic hydrogen cooling, and then by molecular hydrogen cooling down to $\sim\!400\,$Kelvin.