Pressure-driven fragmentation of multiphase clouds at high redshift

摘要: The discovery of a hyper metal-poor star with total metallicity $\le 10^{-5}$ Z$_\odot$, has motivated new investigations how such objects can form from primordial gas polluted by single supernova. In this paper we present shock-cloud model which simulates supernova remnant interacting cloud in metal-free environment at redshift $z=10$. Pre-supernova conditions are considered, include multiphase neutral medium and H II region. A small dense clump ($n=100$ cm$^{-3}$), located 40 pc M$_\odot$ star, embedded $n=10$ cm$^{-3}$ ambient cloud. evolution the (explosion energy $10^{52}$ erg) its subsequent interaction is examined. This first study to comprehensive treatment non-equilibrium chemistry associated radiative cooling that occurring all stages model. We have included network covers temperature range $10-10^9$ K, coupled thermal models atomic & molecular cooling. find $\times10^{3}$ density enhancement (i.e maximum $\sim 78000$ cm$^{-3}$) within consistent Galactic considering solar equilibrium functions. Despite strong compression, does not become gravitationally unstable. modelled here destroyed for shock velocities $\gtrsim 50\,$km s$^{-1}$, significantly affected shocks velocity $\lesssim 30\,$km s$^{-1}$. Rather specific required make collapse.