Effects of binary stellar populations on direct collapse black hole formation

Abstract

The critical Lyman--Werner flux required for direct collapse blackholes (DCBH) formation, or J${}_{crit}$, depends on the shape of the irradiating spectral energy distribution (SED). The SEDs employed thus far have been representative of {realistic} single stellar populations. We study the effect of binary stellar populations on the formation of DCBH, as a result of their contribution to the Lyman--Werner radiation field. Although binary populations with ages $>$ 10 Myr yield a larger LW photon output, we find that the corresponding values of J${}_{crit}$ can be up to 100 times higher than single stellar populations. We attribute this to the shape of the binary SEDs as they produce a sub--critical rate of H${}^{-}$ photodetaching 0.76 eV photons as compared to single stellar populations, reaffirming the role that H${}^{-}$ plays in DCBH formation. This further corroborates the idea that DCBH formation is better understood in terms of a critical region in the H${}_2$--H${}^{-}$ photo--destruction rate parameter space, rather than a single value of LW flux.

5 pages, 4 figures. accepted MNRAS

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• Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes
• Formation of massive seed black holes via collisions and accretion
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