Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....6.2419p&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The dynamical evolution of the Gould Belt has been modelled in 3D and confronted to the spatial and velocity distributions of all HI and H2 clouds within a few hundred parsecs from the Sun and to the Hipparcos distances of the nearby OB associations. The present-day data can be explained by the expansion of a shock wave, with an initial kinetic energy of (1.0 ± 0.1) 1052 erg, over a timespan of 26.4 ± 0.4 Myr, into the local interstellar medium and in the Galactic disc gravitational potential. The current Belt rim coincides with most of the nearby OB associations and H2 clouds. Given the enhanced Belt supernova rate, pulsars born in the Belt in the last few million years are likely to account for persistent unidentified EGRET sources in the Belt. Simulations of the time evolution and visibility (for EGRET) of this pulsar population have been carried out. For standard pulsar emissivities and beaming fractions above 100 MeV, the resulting density map of pulsars visible above the Galactic diffuse emission shows that the asymmetric Belt signature across the sky is preserved over at least 5 Myr.
Grenier Isabelle A.
Perrot Christophe A.
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