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For the first time, we have systematically explored the population ofdiscrete X-ray sources in the outskirts of early-type galaxies. Based on abroad sample of 20 galaxies observed with Chandra we detected overdensity ofX-ray sources in their outskirts. The overdensity appears as halos of resolvedsources around the galaxies. These halos are broader than the stellar light,extending out to at least ~ 10 Re (Re is the effective radius). These halos arecomposed of sources fainter than ~5E38 erg/s, whereas the more luminous sourcesappear to follow the distribution of the stellar light, suggesting that theexcess source population consists of neutron star binaries. Dividing the galaxysample into four groups according to their stellar mass and specific frequencyof globular clusters, we find that the extended halos are present in all groupsexcept for the low-mass galaxies with low globular cluster content. We proposethat the extended halos may be comprised of two independent components,low-mass X-ray binaries (LMXBs) located in globular clusters (GCs), which areknown to have a wider distribution than the stellar light, and neutron star(NS) LMXBs kicked out of the main body of the parent galaxy by supernovaexplosions. The available deep optical and X-ray data of NGC 4365 support thisconclusion. For this galaxy we identified 60.1+/-10.8 excess sources in the4-10 Re region of which ~ 40% are located in GCs, whereas ~ 60% are fieldLMXBs. We interpret the latter as kicked NS LMXBs. We discuss the implicationsof these results for the natal kick distributions of black holes and neutronstars.

LMXB populations in galaxy outskirts: globular clusters and supernova kicks