Observation of the millisecond pulsar PSR J0218+4232 by EGRET

Hermsen, W.; Kuiper, L.; Verbunt, F.; Lyne, A.; Stairs, I.; Thompson, D. J.; Cusumano, G.
April 2000
AIP Conference Proceedings;2000, Vol. 510 Issue 1, p257
Academic Journal
We report on the likely detection of pulsed high-energy γ-rays from the binary millisecond pulsar PSR J0218+4232 in 100–1000 MeV data from CGRO EGRET. Imaging analysis demonstrates that the highly significant γ-ray source 2EG J0220+4228 (∼10σ) 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 ∼3.5σ significance level. The phase separation is similar to the component separation of ∼0.47 observed at X-rays with ROSAT HRI (0.1–2.4 keV) and BSAX MECS (1.6–10 keV). A comparison in absolute phase of the γ-ray profile with the 610 MHz radio profile shows that the two γ-ray pulses coincide with two of the three emission features in the complex radio profile. The luminosity in high-energy γ-rays appears to amount ∼10% of the total pulsar spin-down luminosity. © 2000 American Institute of Physics.


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