期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 725, 期 1, 页码 L6-L10出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/725/1/L6
关键词
pulsars: individual (PSR J0007+7303); stars: neutron
资金
- ESA
- USA (NASA)
- [ASI-INAF I/088/06/0]
- [NASA NIPR NNG10PL01I30]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0838178] Funding Source: National Science Foundation
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.
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