Stellar feedback from black-hole high-mass X-ray binaries in galaxy formation models

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

Buenos Aires

Workshop; Third Workshop on Numerical Observational Astrophysics; 2014

Due to the large mean free path of X-ray photons, many works have Suggested that black-hole high-mass X-ray binaries (BHX) could be potential sources of heating and ionization of the intergalactic medium. Furthermore, because of the suggested increase of their production rate and X-ray luminosity with decreasing metallicity, BHX could be relevant to explain the thermal and ionization history of the Universe at its early stages. Besides their role as ionizing sources of the intergalactic medium, observations indicate that a meaningful amount of the energy released by these sources could be deposited in the local interstellar medium, suggesting that BHX could modify star forming regions in the host galaxy. In this work, we explore the role of BHX as sources of thermal feedback by using hydrodynamical cosmological simulations of galaxy formation. Our simulations also include supernovae feedback (type II and Ia), chemical enrichment of baryons, and a multiphase treatment of the gas component in a self-consistent way. The implemented model only consider extremely metal poor BHXs, which inject their energy into the cold gas phase of their surrounding medium. In this poster, we present our results comparing simulated galaxies with BHX feedback and without it. Our Results show that BHX feedback keeps the interstellar medium heated Without removing it. This prevents early star formation, delaying it for later. This result is evidenced by the cosmic star formation rate, which is well reproduced in the simulation that includes BHX feedback.