Computer Science
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..510..257h&link_type=abstract
THE FIFTH COMPTON SYMPOSIUM. AIP Conference Proceedings, Volume 510, pp. 257-261 (2000).
Computer Science
2
Pulsars, Gamma-Ray
Scientific paper
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. .
Cusumano Giancarlo
Hermsen Willem
Kuiper Lucien
Lyne Andrew
Stairs Ingrid
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