ИСТИНА

After a supernova explosion significant amount of matter can fall-back on a compact object. If it is a neutron star (NS) - then its properties can be significantly modified. Matter can screen magnetic field of a NS such that we observe an object with low surface magnetic field. It is believed that central compact objects in supernova remnants (CCOs) are examples of NSs which experienced a fall-back episode. Later, magnetic field diffuses out, and finally a radio pulsar can switch-on. Using numerical simulations we explore this possibility (MNRAS vol. 462, pp. 3689-3702, 2016. arXiv: 1608.08806). We distinguish three evolutionary epochs for the re-emergence process: the growth of internal toroidal field, the advection of buried poloidal field, and slow Ohmic diffusion. The e fficiency of the first two stages can be enhanced when small-scale magnetic structure is present. The e fficient re-emergence of high order harmonics might significantly affect the curvature of the magnetospheric field lines in the emission zone. So, only after few 10000yrs would the NS starts shining as a pulsar again, which is in correspondence with radio silence of CCOs. In addition, these results can explain the absence of good candidates for thermally emitting NSs with freshly re-emerged field among radio pulsars, as NSs have time to cool down, and supernova remnants can already dissipate.