An Alternative Channel For High-Mass Binary Black Holes-----Dark Matter Accretion Onto Black Hole

Abstract

By a method of population synthesis we construct a model of dark matter (DM) accretion onto binary black holes (BHs), and investigate the merger rate of the binary BHs. We find that the merger rate can weakly increase (less than 10\%). However, the DM accretion can efficiently enhance the masses of binary BHs. In our model, the result for $Z=0.01$ without the DM accretion can not explain the GW170104, GW170814, and GW150914, while with the DM accretion, it can cover all observations well. For the higher metallicity ($Z=0.02$), our model can not explain the mergers of high-mass binary BHs like GW170104, GW170814, and GW150914. We estimate that the merger rate of binary BHs lies between $55Gp{\mathrm{c}}^{-3}\mathrm{y}{\mathrm{r}}^{-1}$ to $197Gp{\mathrm{c}}^{-3}\mathrm{y}{\mathrm{r}}^{-1}$.

arXiv comment8 pages, 5 figures, accepted for the ApJ

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