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Likely detection of pulsed high-energy γ-rays from millisecond pulsar PSR J0218+4232
- Source :
- International Astronomical Union Colloquium. 177:355-358
- Publication Year :
- 2000
- Publisher :
- Cambridge University Press (CUP), 2000.
-
Abstract
- We report on the likely detection of pulsed high-energyγ-rays from the binary millisecond pulsar PSR J0218+4232 in 100–1000 MeV data from CGRO EGRET. Imaging analysis demonstrates that the highly significantγ-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 ∼ 3.5σsignificance level. The phase separation is similar to the component separation of ∼ 0.47 observed at X-rays. A comparison of theγ-ray profile with the 610 MHz radio profile in absolute phase shows that the twoγ- ray pulses coincide with two of the three emission features in the complex radio profile.
Details
- ISSN :
- 02529211
- Volume :
- 177
- Database :
- OpenAIRE
- Journal :
- International Astronomical Union Colloquium
- Accession number :
- edsair.doi...........5a2eb8a1c917c5c4245bcdabdf486736