Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aipc..587..668t&link_type=abstract
GAMMA 2001: Gamma-Ray Astrophysics 2001. AIP Conference Proceedings, Volume 587, pp. 668-672 (2001).
Astronomy and Astrophysics
Astrophysics
3
Pulsars, Gamma-Ray Sources, Gamma-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
As noted in the Third EGRET Catalog, six sources near the bright Vela pulsar are thought to be artifacts: 3EG J0824-4610, 3EG J0827-4247, 3EG J0828-4954, 3EG J0841-4356, 3EG J0848-4429, and 3EG J0859-4257. This conclusion is based on analysis of phase-resolved maps of the pulsar region. The artifact sources are statistically significant only in the on-pulse maps where Vela itself is bright. Details of this analysis show that there is at most one source in addition to Vela in this region. Additional analysis using the same phase-resolved-map technique suggests that one of the four sources near the Crab pulsar, 3EG J0521+2147, is also likely to be an artifact. Both of the sources closest to Geminga are detected at comparable levels in both on-pulse and off-pulse maps, supporting their validity. These results illustrate the difficulty of detecting weak sources near bright ones, even using modeling techniques such as maximum likelihood. .
Bertsch David L.
Hartman Robert C.
Thompson Daniel J.
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