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arXiv · 2107.07775

A Fundamental Plane in X-ray Binary Activity of External Galaxies

Yoshiyuki Inoue·Kiyoto Yabe·Yoshihiro Ueda
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Abstract

We construct a new catalog of extragalactic X-ray binaries (XRBs) by matching the latest Chandra source catalog with local galaxy catalogs. Our XRB catalog contains 4430 XRBs hosted by 237 galaxies within ~130 Mpc. As XRBs dominate the X-ray activity in galaxies, the catalog enables us to study the correlations between the total X-ray luminosity of a galaxy $L_{X,\rm tot}$, star formation rate $\dotρ_\star$, and stellar mass $M_\star$. As previously reported, $L_{X,\rm tot}$ is correlated with $\dotρ_\star$ and $M_\star$. In particular, we find that there is a fundamental plane in those three parameters as $\log L_{X,\rm tot}={38.80^{+0.09}_{-0.12}}+\log(\dotρ_\star + αM_\star)$, where $α= {(3.36\pm1.40)\times10^{-11}}\ {\rm yr^{-1}}$. In order to investigate this relation, we construct a phenomenological binary population synthesis model. We find that the high mass XRB and low mass XRB fraction in formed compact object binary systems is ~9% and ~0.04%, respectively. Utilizing the latest XMM-Newton, and Swift X-ray source catalog data sets, additional XRB candidates are also found resulting in 5757 XRBs hosted by 311 galaxies.

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Yoshiyuki Inoue, Kiyoto Yabe, Yoshihiro Ueda. 2021-07-16. A Fundamental Plane in X-ray Binary Activity of External Galaxies. https://doi.org/10.1093/pasj%2Fpsab077

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