Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-15
Astronomy and Astrophysics
Astrophysics
To appear in conference proceedings of IAU 177: Pulsar Astronomy - 2000 and beyond, 30 August - 3 September 1999, Bonn, German
Scientific paper
We report on the likely detection of pulsed high-energy gamma-rays from the binary millisecond pulsar PSR J0218+4232 in 100-1000 MeV data from CGRO EGRET. Imaging analysis demonstrates that the highly significant gamma-ray source 2EG J0220+4228 (~10 sigma) is for energies > 100 MeV positionally consistent with both PSR J0218+4232 and the BL Lac 3C66A. However, above 1 GeV 3C66A is the evident counterpart, whereas between 100 and 300 MeV PSR J0218+4232 is the most likely one. Timing analysis using one ephemeris valid for all EGRET observations yields in the 100-1000 MeV range a double-pulse profile at a ~3.5 sigma significance level. The phase separation is similar to the component separation of ~0.47 observed at X-rays. A comparison of the gamma-ray profile with the 610 MHz radio profile in absolute phase shows that the two gamma- ray pulses coincide with two of the three emission features in the complex radio profile.
Cusumano Giancarlo
Hermsen Willem
Kuiper Lucien
Lyne Andrew
Stairs Ingrid
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