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We present new Chandra constraints on the X-ray luminosity functions (XLFs)of X-ray binary (XRB) populations, and their scaling relations, for a sample of38 nearby galaxies (D = 3.4-29 Mpc). Our galaxy sample is drawn primarily fromthe Spitzer infrared nearby galaxy survey (SINGS), and contains a wealth ofChandra (5.8 Ms total) and multiwavelength data, allowing for star-formationrates (SFRs) and stellar masses (M*) to be measured on subgalactic scales. Wedivided the 2478 X-ray detected sources into 21 subsamples in bins ofspecific-SFR (sSFR = SFR/M*) and constructed XLFs. To model the XLF dependenceon sSFR, we fit a global XLF model, containing contributions from high-massXRBs (HMXBs), low-mass XRBs (LMXBs), and background sources from the cosmicX-ray background (CXB) that respectively scale with SFR, M*, and sky area. Wefind an HMXB XLF that is more complex in shape than previously reported and anLMXB XLF that likely varies with sSFR, potentially due to an age dependence.When applying our global model to XLF data for each individual galaxy, wediscover a few galaxy XLFs that significantly deviate from our model beyondstatistical scatter. Most notably, relatively low-metallicity galaxies have anexcess of HMXBs above ~10^38 erg/s and elliptical galaxies that have relativelyrich populations of globular clusters (GCs) show excesses of LMXBs compared tothe global model. Additional modeling of how the XRB XLF depends on stellarage, metallicity, and GC specific frequency is required to sufficientlycharacterize the XLFs of galaxies.

X-ray Binary Luminosity Function Scaling Relations for Local Galaxies Based on Subgalactic Modeling