Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-02-04
Astronomy and Astrophysics
Astrophysics
4 pages, 3 figures. To appear in Proceedings of the Symposium "New Visions of the X-ray Universe in the XMM-Newton and Chandra
Scientific paper
The pulsar PSR J0631+1036 was discovered during a radio search of Einstein X-ray source error circles. A detection of a 288ms sinusoidal modulation in the ASCA lightcurve, the same period as the radio pulsar, appeared to confirm the association of the X-ray source and the pulsar. Its X-ray spectrum was said to be similar to that of middle aged gamma-ray pulsars such as Geminga. However, an XMM-Newton observation of the PSR J0631+1035 field, along with a re-analysis of VLA data confirming the timing position of the pulsar, show a 75'' discrepancy in location of the X-ray source and the pulsar, and therefore these cannot be the same object. The X-ray source appears to be the counterpart of an A0 star, detected by the XMM-Newton Optical Monitor. No 288ms period was detected from either the area around the pulsar or the bright X-ray source. The upper limit on the X-ray luminosity with relation to the empirically observed correlation between radio measured dE/dt and X-ray luminosity is discussed.
Chatterjee Saikat
Cordes Jim
Cordova France
Ho Cheng
Kennea Jamie
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