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We propose that observations of "hidden" magnetars in central compact objectscan be used to probe crustal activity of neutron stars with large internalmagnetic fields. Estimates based on calculations by Perna \& Pons (2011), Pons\& Rea (2012) and Kaminker et al. (2014) suggest that central compact objects,which are proposed to be "hidden" magnetars, must demonstrate flux variationson the time scale of months-years. However, the most prominent candidate forthe "hidden" magnetars --- CXO J1852.6+0040 in Kes 79, -- shows constant(within error bars) flux. This can be interpreted by lower variable crustalactivity than in typical magnetars. Alternatively, CXO J1852.6+0040 can be in ahigh state of variable activity during the whole period of observations. Thenwe consider the source 1E161348-5055 in RCW103 as another candidate. Employinga simple 2D-modeling we argue that properties of the source can be explained bythe crustal activity of the magnetar type. Thus, this object may besupplemented for the three known candidates for the "hidden" magnetars amongcentral compact objects discussed in literature.

Central compact objects in Kes 79 and RCW 103 as "hidden" magnetars with crustal activity