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We report the identification from multi-wavelength observations of the FermiLarge Area Telescope (LAT) source 4FGL J1405.1-6119 (= 3FGL J1405.4-6119) as ahigh-mass gamma-ray binary. Observations with the LAT show that gamma-rayemission from the system is modulated at a period of 13.7135 +/- 0.0019 days,with the presence of two maxima per orbit with different spectral properties.X-ray observations using the Neil Gehrels Swift Observatory X-ray Telescope(XRT) show that X-ray emission is also modulated at this period, but with asingle maximum that is closer to the secondary lower-energy gamma-ray maximum.A radio source, coincident with the X-ray source, is also found from AustraliaTelescope Compact Array (ATCA) observations, and the radio emission ismodulated on the gamma-ray period with similar phasing to the X-ray emission. Alarge degree of interstellar obscuration severely hampers optical observations,but a near-infrared counterpart is found. Near-infrared spectroscopy indicatesan O6 III spectral classification. This is the third gamma-ray binary to bediscovered with the Fermi LAT from periodic modulation of the gamma-rayemission, the other two sources also have early O star, rather than Be star,counterparts. We consider at what distances we can detect such modulatedgamma-ray emission with the LAT, and examine constraints on the gamma-raybinary population of the Milky Way.

Discovery of the Galactic High-Mass Gamma-ray Binary 4FGL J1405.1-6119