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

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 $L_{X,\mathrm{tot}}$, star formation rate ${\dot{\rho }}_{\star }$, and stellar mass $M_{\star }$. As previously reported, $L_{X,\mathrm{tot}}$ is correlated with ${\dot{\rho }}_{\star }$ and $M_{\star }$. In particular, we find that there is a fundamental plane in those three parameters as $\log L_{X,\mathrm{tot}}=38.80_{-0.12}^{+0.09}+\log ({\dot{\rho }}_{\star }+\alpha M_{\star })$, where $\alpha =(3.36\pm 1.40)\times 10^{-11}\mathrm{y}{\mathrm{r}}^{-1}$. 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.

18 pages, 18 figures, accepted for publication in PASJ

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