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X-ray observations unveiled the existence of enigmatic point-like sources atthe centre of young supernova remnants (SNRs). These sources, dubbed CentralCompact Objects (CCOs), are thought to be neutron stars formed by the supernovaexplosion. However, their multi-wavelength phenomenology is surprisinglydifferent from that of most young neutron stars.The aim of this work is tounderstand the nature of the CCO 1WGA J1713.4-3949 in the G347.3-0.5 SNR,through deep optical and IR observations, the first ever performed for thissource.By exploiting its derived Chandra X-ray position we carried out optical(BVI) observations with the NTT and Adaptive Optics IR (JHKs) observations withthe VLT. We detected two faint (I~23.5, I~24.3.) patchy objects in the NTTimages, close to the Chandra error circle. They were clearly resolved in ourVLT images which unveiled a total of six candidate counterparts (17.8<H<20.3)with quite red colours (H-Ks~0.6). If they are stars, none of them can beassociated with 1WGA J1713.4-3949 for the most likely values of distance andhydrogen column density. The identification of the faintest candidate with theneutron star itself can not be firmly excluded, while the identification with afallback disk is ruled out by its non-detection in the I band. No othercandidates are detected down to B~26, V~26.2, I~24.7, H~21.3 and K~20.5. Ourhigh-resolution IR imaging of unveiled a few objects close/within the ChandraX-ray position of 1WGA J1713.4-3949. However, at present none of them can befirmly identified as its likely counterpart.

Optical and Infrared Observations of the X-ray source 1WGA J1713.4$-$3949 in the G347.3-0.5 SNR