1998/12/22 by L. Kuiper, Kuiper, L., W. Hermsen +7
Physics and Astronomy · #Astrophysics (astro-ph) #FOS: Physical sciences #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9812408
4 Pages, including 5 Figures, to appear in Proceedings 3rd INTEGRAL Workshop : The extreme Universe, Taormina, Italy, 14-18 sept. 1998
arxiv created 1998/12/22 · arxiv updated 2009/12/01
We report the detection of pulsed X-ray emission (4.9σ) 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 ∼ 0.47 phase separation. The pulsed fraction is 37 ± 13%. PSR J0218+4232 was several times in the field of view of the high-energy γ-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 γ-ray pulsar.