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Terzan 5, a globular cluster (GC) prominent in mass and population of compactobjects, is searched for diffuse X-ray emission, as proposed by several models.We analyzed the data of an archival Chandra observation of Terzan 5 to searchfor extended diffuse X-ray emission outside the half-mass radius of the GC. Weremoved detected point sources from the data to extract spectra from diffuseregions around Terzan 5. The Galactic background emission was modeled by a2-temperature thermal component, which is typical for Galactic diffuseemission.  We detected significant diffuse excess emission above the particle backgroundlevel from the whole field-of-view. The surface brightness appears to be peakedat the GC center and decreases smoothly outwards. After the subtraction ofparticle and Galactic background, the excess spectrum of the diffuse emissionbetween the half-mass radius and 3' can be described by a power-law model withphoton index $\Gamma$ = 0.9$\pm$0.5 and a surface flux of F$_X$ =(1.17$\pm$0.16) 10$^{-7}$ erg s$^{-1}$ cm$^{-2}$ sr$^{-1}$ in the 1--7 keVband. We estimated the contribution from unresolved point sources to theobserved excess to be negligible. The observations suggest that a purelythermal origin of the emission is less likely than a non-thermal scenario.However, from simple modeling we cannot identify a clearly preferred scenario.

Chandra detection of diffuse X-ray emission from the globular cluster Terzan 5