Period evolution of the remarkable CCO 1E 1207.4--5209

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Supernovae, Supernova Remnants, Diffuse (Galactic) Emission And Isolated Neutron Stars, 1E 1207.4-5209, 1E 1207.4-5209, Xmm-Newton Proposal Id #05528102

Scientific paper

1E 1207.4-5209, the central compact object in the SNR PKS 1209-51/52, shows absorption lines in its thermal X-ray spectrum and 424 ms pulsations. The phase-coherent timing of 14 XMM-Newton and Chandra observations of 2000-2005 resulted in two timing solutions with different signs and very small magnitudes of period derivative. The spin-down solution suggests that 1E1207 is a neutron star born with a rather low magnetic field and almost the same period as that currently observed. The spin-up solution could be explained by a low-rate accretion from a supernova debris disk. To find the unique timing solution and understand the properties of this enigmatic object, we propose new timing observations, which will be phase-connected with all the previous observations.

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