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AX J1845-0258 is a transient X-ray pulsar, with spin period of 6.97s,discovered with the ASCA satellite in 1993. Its soft spectrum and the possibleassociation with a supernova remnant suggest that AX J1845-0258 might be amagnetar, but this has not been confirmed yet. A possible counterpart one orderof magnitude fainter, AX J184453-025640, has been found in later X-rayobservations, but no pulsations have been detected. In addition, some otherX-ray sources are compatible with the pulsar location, which is in a crowdedregion of the Galactic plane. We have carried out a new investigation of allthe X-ray sources in the ASCA error region of AX J1845-0258, using archivaldata obtained with Chandra in 2007 and 2010, and with XMM-Newton in 2010. Weset an upper limit of 6% on the pulsed fraction of AX J184453-025640 andconfirmed its rather hard spectrum (power law photon index of 1.2 +\- 0.3). Inaddition to the other two fainter sources already reported in the literature,we found other X-ray sources positionally consistent with AX J1845-0258.Although many of them are possibly foreground stars likely unrelated to thepulsar, at least another new source, CXOU J184457.5-025823, could be aplausible counterpart of AX J1845-0258. It has a flux of 6x10^{-14} erg cm^{-2}s^{-1} and a spectrum well fit by a power law with photon index ~1.3 and Nh ~10^{22} cm^{-2}.

A new investigation of the possible X-ray counterparts of the magnetar candidate AX J1845-0258