We used archival data from the \emph{ Chandra X-ray Observatory} (\emph{ Chandra}) and the \emph{ Hubble Space Telescope}, to identify 334 candidate X-ray binary (XRB) systems and their potential optical counterparts in the interacting galaxy pair NGC 5194/5195 (M51). We present the catalog and data analysis of X-ray and optical properties for those sources, from the deep $892$ ks \emph{ Chandra} observations, along with the magnitudes of candidate optical sources as measured in the $8.16$ ks \emph{ HST} observations. The X-ray luminosity function of the X-ray sources above a few times $10^{ 36}\, { \rm erg\,s^{ -1}}$ follows a power law $N(>L_{ X,b})\propto L_{ X,b}^{ 1-\alpha}$ with $\alpha=1.65\pm0.03$. Aproximately 80\% of sources are variable over a 30 day window. Nearly half of the X-ray sources (173/334) have an optical counterparts within $0{ \mbox{ $.\!\!^{ \prime\prime}$}}5$.
Categories: astro-ph.HE