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arXiv · 1206.2395

X-ray Binary Evolution Across Cosmic Time

Tassos Fragos·Bret Lehmer·Michael Tremmel·Panayiotis Tzanavaris·Antara Basu-Zych·Krzysztof Belczynski·Ann Hornschemeier·Leigh Jenkins·Vassiliki Kalogera·Andrew Ptak·Andreas Zezas
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Abstract

High redshift galaxies permit the study of the formation and evolution of X-ray binary populations on cosmological timescales, probing a wide range of metallicities and star-formation rates. In this paper, we present results from a large scale population synthesis study that models the X-ray binary populations from the first galaxies of the universe until today. We use as input to our modeling the Millennium II Cosmological Simulation and the updated semi-analytic galaxy catalog by Guo et al. (2011) to self-consistently account for the star formation history and metallicity evolution of the universe. Our modeling, which is constrained by the observed X-ray properties of local galaxies, gives predictions about the global scaling of emission from X-ray binary populations with properties such as star-formation rate and stellar mass, and the evolution of these relations with redshift. Our simulations show that the X-ray luminosity density (X-ray luminosity per unit volume) from X-ray binaries in our Universe today is dominated by low-mass X-ray binaries, and it is only at z>2.5 that high-mass X-ray binaries become dominant. We also find that there is a delay of ~1.1 Gyr between the peak of X-ray emissivity from low-mass Xray binaries (at z~2.1) and the peak of star-formation rate density (at z~3.1). The peak of the X-ray luminosity from high-mass X-ray binaries (at z~3.9), happens ~0.8 Gyr before the peak of the star-formation rate density, which is due to the metallicity evolution of the Universe.

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Tassos Fragos, Bret Lehmer, Michael Tremmel, Panayiotis Tzanavaris, Antara Basu-Zych, Krzysztof Belczynski, Ann Hornschemeier, Leigh Jenkins, Vassiliki Kalogera, Andrew Ptak, Andreas Zezas. 2012-11-20. X-ray Binary Evolution Across Cosmic Time. https://doi.org/10.1088/0004-637x%2F764%2F1%2F41

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