PSR J1814 - 1744 is a 4 s radio pulsar with surface dipole magnetic field strength 5.5 \times 10 ^ { 13 } G , inferred assuming simple magnetic dipole braking .
This pulsar ’ s spin parameters are very similar to those of anomalous X-ray pulsars ( AXPs ) , suggesting that this may be a transition object between the radio pulsar and AXP population , if AXPs are isolated , high magnetic field neutron stars as has recently been hypothesized .
We present archival X-ray observations of PSR J1814 - 1744 made with ROSAT and ASCA .
X-ray emission is not detected from the position of the radio pulsar .
The derived upper flux limit implies an X-ray luminosity significantly smaller than those of all known AXPs .
This conclusion is insensitive to the possibility that X-ray emission from PSR J1814 - 1744 is beamed or that it undergoes modest variability .
When interpreted in the context of the magnetar mechanism , these results argue that X-ray emission from AXPs must depend on more than merely the inferred surface magnetic field strength .
This suggests distinct evolutionary paths for radio pulsars and AXP , despite their proximity in period–period derivative phase space .