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We report on a multi-wavelength study of the unclassified X-ray source CXOUJ110926.4-650224 (J1109). We identified the optical counterpart as a blue starwith a magnitude of $\sim$20.1 (3300-10500 $\require{mediawiki-texvc} \AA$).The optical emission was variable on timescales from hundreds to thousands ofseconds. The spectrum showed prominent emission lines with variable profiles atdifferent epochs. Simultaneous XMM-Newton and NuSTAR observations revealed abimodal distribution of the X-ray count rates on timescales as short as tens ofseconds, as well as sporadic flaring activity. The average broad-band (0.3-79keV) spectrum was adequately described by an absorbed power law model withphoton index of $\Gamma$=1.63$\pm$0.01 (at 1$\sigma$ c.l.), and the X-rayluminosity was (2.16$\pm$0.04)$\times$10$^{34}$ erg s$^{-1}$ for a distance of4 kpc. Based on observations with different instruments, the X-ray luminosityhas remained relatively steady over the past $\sim$15 years. J1109 is spatiallyassociated with the gamma-ray source FL8Y J1109.8-6500, which was detected withFermi at an average luminosity of (1.5$\pm$0.2)$\times$10$^{34}$ erg s$^{-1}$(assuming the distance of J1109) over the 0.1-300 GeV energy band between 2008and 2016. The source was undetected during ATCA radio observations that weresimultaneous with NuSTAR, down to a 3$\sigma$ flux upper limit of 18$\mu$Jy/beam (at 7.25 GHz). We show that the phenomenological properties ofJ1109 point to a binary transitional pulsar candidate currently in asub-luminous accretion disk state, and that the upper limits derived for theradio emission are consistent with the expected radio luminosity for accretingneutron stars at similar X-ray luminosities.

Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4-650224