Other
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pasb.conf...31k&link_type=abstract
"Pulsars, AXPs and SGRs observed with BeppoSAX and Other Observatories, Proceedings of the International Workshop held in Marsal
Other
4
Scientific paper
We report on high-resolution spatial and timing observations of the millisecond pulsar PSR J0218+4232 performed with the Chandra X-ray Observatory (CXO) and the Rossi X-ray Timing Explorer (RXTE). With these observations we were able to study: a) the possible spatial extent at X-ray energies of the DC source coincident with PSR J0218+4232 in detail (CXO), b) the relative phasing between the X-ray, radio and gamma-ray profiles (CXO and RXTE) and c) the spectral properties at energies beyond 10 keV (RXTE). We found no indications for extended emission at X-ray energies down to about 1" scales and confirmed the presence of a point-like DC-component. The two non-thermal pulses in the X-ray profile are found to be aligned with two of the three pulses visible at radio-frequencies, and more importantly, with the two gamma-ray pulses seen in the EGRET 100-1000 MeV pulse profile. The latter yields now a random occurrence probability for the detection of the gamma-ray signal of about 10-6, which corresponds to a 4.9 sigma detection significance. This strenghtens the credibility of our earlier claimed detection of pulsed high-energy gamma-ray emission from this millisecond pulsar. The pulsed spectrum extends to about 20 keV and can be described by a power-law with photon index of 1.14, slightly softer than measured by the BeppoSAX and XMM for energies below 10 keV. The hard spectrum at X-ray energies and the soft spectrum at high gamma-ray energies is similar to that of Unidentified Gamma-Ray Sources (UGS). Therefore, fast millisecond pulsars with hard X-ray spectra seem to be promising candidates for an UGS association.
Hermsen Willem
Kuiper Lucien
Stappers Ben
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