Stellar feedback from high-mass X-ray binaries in cosmological hydrodynamical simulations

ARTALE, M.C.; TISSERA, P.B.; PELLIZZA, L.J.

La Plata

Congreso; 58a. Reunión de la Asociación Argentina de Astronomía; 2015

Recently, high mass X-ray binaries have been proposed as important sources of energy feedback to the interstellar medium and intergalactic medium in the early Universe. In this work we explored the role of these sources composed by a black hole and a massive stellar companion (BHXs) by using hydrodynamical cosmological simulations. Following previous results, our model assumes metal-poor stars (Z = [0, 10−4]) as potential progenitors of BHXs. In order to reproduce the observed cosmic star formation rate, the best model considers that 20% of black holes are in binary systems producing BHXs which deposit 1052 erg of energy into the surrounding environment. With these parameters and in the simulated volume, we found that the energy injected by BHXs represents 30% of the total energy released by SNII and BHXs events at z 7, decreasing as baryons get chemically enriched. The results suggest that haloes with virial masses smaller than 1010M are the most directly affected ones by BHX feedback. This feedback is able to keep the interstellar medium warm, without removing a significant gas fraction, in agreement with previous analytical calculations. These findings support previous claims that the BHXs could be an effective source of feedback in early stages of galaxy evolution.