A UV flux constraint on the formation of direct collapse black holes

• DOI: 10.1093/mnras/stu1230
• Publication Date: 2014-07-26T02:44:04Z
• Authors: M. A. Latif; S. Bovino; C. Van Borm; T. Grassi; D. R. G. Schleicher; M. Spaans
• Keywords: Ultraviolet

The ability of metal free gas to cool by molecular hydrogen in primordial halos is strongly associated with the strength ultraviolet (UV) flux produced stellar populations first galaxies. Depending on spectrum, these UV photons can either dissociate $\rm H_{2}$ molecules directly or indirectly photo-detachment H^{-}$ as latter provides main pathway for formation early universe. In this study, we aim determine critical above which remains suppressed a sample five distinct at $z>10$ employing higher order chemical solver and Jeans resolution 32 cells. We presume that such emitted PopII stars implying atmospheric temperatures 10^{4}$~K. performed three-dimensional cosmological simulations varied below Lyman limit units J_{21}$. Our findings show value J_{21}^{crit}$ varies from halo sensitive local thermal conditions gas. For simulated it 400-700 exception one where J_{21}^{crit} \geq 1500$. This has important implications direct collapse black holes their estimated population z > 6. It reduces number density almost three orders magnitude compared previous estimates.