1E 1207.4-5209: The puzzling pulsar at the center of the PKS 1209-51/52 supernova remnant

G. G. Pavlov; V. E. Zavlin; D. Sanwal; J. Trumper

doi:10.1086/340640

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1E 1207.4-5209: The puzzling pulsar at the center of the PKS 1209-51/52 supernova remnant

G. G. Pavlov·V. E. Zavlin·D. Sanwal·J. Trumper

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Abstract

Second Chandra observation of 1E 1207.4-5209, the central source of the supernova remnant PKS 1209-51/52, allowed us to confirm the previously detected period of 424 ms and, assuming a uniform spin-down, estimate the period derivative, Pdot (0.7-3)e-14 s/s. The corresponding characteristic age of the pulsar, P/2Pdot~200-900 kyr, is much larger than the estimated age of the SNR, \~7 kyr. The values of the spin-down luminosity, Edot (0.4-1.6)e34 erg/s, and conventional magnetic field, B (2-4)e12 G, are typical for a middle-aged radio pulsar, although no manifestations of pulsar activity have been observed. If 1E 1207.4-5209 is indeed the neutron star formed in the same supernova explosion that created PKS 1209-51/52, such a discrepancy in ages could be explained either by a long initial period, close to its current value, or, less likely, by a very large braking index of the pulsar. Alternatively, the pulsar could be a foreground object unrelated to the supernova remnant, but the probability of such a coincidence is very low.

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G. G. Pavlov, V. E. Zavlin, D. Sanwal, J. Trumper. 2002-03-18. 1E 1207.4-5209: The puzzling pulsar at the center of the PKS 1209-51/52 supernova remnant. https://doi.org/10.1086/340640

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