High-Energy Observations of the Binary Millisecond Pulsar PSR J0218+4232

Details High-Energy Observations of the Binary Millisecond Pulsar PSR J0218+4232 High-Energy Observations of the Binary Millisecond Pulsar PSR J0218+4232

1998-12-22

arxiv.org/abs/astro-ph/9812408v1

Astronomy and Astrophysics

Astrophysics

4 Pages, including 5 Figures, to appear in Proceedings 3rd INTEGRAL Workshop : The extreme Universe, Taormina, Italy, 14-18 se

Scientific paper

We report the detection of pulsed X-ray emission ($4.9\sigma$) from the binary millisecond pulsar PSR J0218+4232 in a 100 ks ROSAT HRI observation. The pulse profile shows a sharp main pulse and an indication for a second weaker pulse at $\sim$ 0.47 phase separation. The pulsed fraction is 37 \pm 13%. PSR J0218+4232 was several times in the field of view of the high-energy $\gamma$-ray telescope EGRET and a source positionally consistent with the pulsar was detected above 100 MeV. Spatial and timing analyses of EGRET data indicate that the source is probably multiple: Between 0.1 GeV and 1 GeV PSR J0218+4232 is the most likely counterpart, while the BL Lac 3C66A is the best candidate above 1 GeV. If part of the EGRET signal truly belongs to the pulsar, then this would be the first millisecond $\gamma$-ray pulsar.

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