X-ray pulsations from the radio-quiet gamma-ray pulsar in CTA 1Report as inadecuate



 X-ray pulsations from the radio-quiet gamma-ray pulsar in CTA 1


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Prompted by the Fermi LAT discovery of a radio-quiet gamma-ray pulsar inside the CTA 1 supernova remnant, we obtained a 130 ks XMM-Newton observation to assess the timing behavior of this pulsar. Exploiting both the unprecedented photon harvest and the contemporary Fermi LAT timing measurements, a 4.7 sigma single peak pulsation is detected, making PSR J0007+7303 the second example, after Geminga, of a radio-quiet gamma-ray pulsar also seen to pulsate in X-rays. Phase-resolved spectroscopy shows that the off-pulse portion of the light curve is dominated by a power-law, non-thermal spectrum, while the X-ray peak emission appears to be mainly of thermal origin, probably from a polar cap heated by magnetospheric return currents, pointing to a hot spot varying throughout the pulsar rotation.



Author: P. A. Caraveo; A. De Luca; M. Marelli; G. F. Bignami; P. S. Ray; P. M. Saz-Parkinson; G. Kanbach

Source: https://archive.org/







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