Implications of the cosmic infrared background excess for the cosmic star formation

Abstract

By phenomenologically describing the high-redshift star formation history, i.e., ${\dot{\rho }}_{\ast }(z)\propto [(1+z)/4.5{]}^{-\alpha }$, and semi-analytically calculating the fractions of high-redshift Pop I/II and Pop III stars, we investigate the contributions from both high-redshfit Pop I/II and Pop III stars to the observed near-infrared ($3\mu \mathrm{m}<\lambda <5\mu \mathrm{m}$) excess in the cosmic infrared background emission. In order to account for the observational level of the near-infrared excess, the power-law index $\alpha$ of the assumed star formation history is constrained to within the range of $0\lesssim \alpha \lesssim 1$. Such a constraint is obtained under the condition that the virial temperature of dark matter halos belongs to the range of $500\mathrm{K}\le T_{\mathrm{vir}}\le 10^4$ K.

6 pages, 5 figures, published in SCIENCE CHINA Physics, Mechanics and Astronomy

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