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We have carried out an in-depth study of low-mass X-ray binaries (LMXBs)detected in the nearby lenticular galaxy NGC 3115, using the Megasecond ChandraX-Ray Visionary Project observation (total exposure time 1.1 Ms). In total wefound 136 candidate LMXBs in the field and 49 in globular clusters (GCs) above2\sigma\ detection, with 0.3--8 keV luminosity L_X ~10^36-10^39 erg/s. Otherthan 13 transient candidates, the sources overall have less long-termvariability at higher luminosity, at least at L_X > 2x10^37 erg/s. In order toidentify the nature and spectral state of our sources, we compared theircollective spectral properties based on single-component models (a simple powerlaw or a multicolor disk) with the spectral evolution seen in representativeGalactic LMXBs. We found that in the L_X versus photon index \Gamma_PL and L_Xversus disk temperature kT_MCD plots, most of our sources fall on a narrowtrack in which the spectral shape hardens with increasing luminosity belowL_X~7x10^37 erg/s but is relatively constant (\Gamma_PL~1.5 or kT_MCD~1.5 keV)above this luminosity, similar to the spectral evolution of Galactic neutronstar (NS) LMXBs in the soft state in the Chandra bandpass. Therefore weidentified the track as the NS LMXB soft-state track and suggested sources withL_X<7x10^37 erg/s as atolls in the soft state and those with L_X>7x10^37 erg/sas Z sources. Ten other sources (five are transients) displayed significantlysofter spectra and are probably black hole X-ray binaries in the thermal state.One of them (persistent) is in a metal-poor GC.

The Megasecond Chandra X-Ray Visionary Project Observation of NGC 3115 (II): properties of point sources