Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.2609b&link_type=abstract
American Astronomical Society, HEAD meeting #12, #26.09
Astronomy and Astrophysics
Astronomy
Scientific paper
To constrain the giant pulse (GP) emission mechanism and test the model of Lyutikov (2007) for GP emission, we have carried out a campaign of simultaneous observations of the Crab pulsar at γ-ray (Fermi) and radio (Green Bank Telescope) wavelengths. Over 10 hours of simultaneous observations we obtained a sample of 21000 giant pulses, observed at a radio frequency of 9 GHz, and 77 Fermi photons, with energies between 100 MeV and 5 GeV. We found no change in the GP generation rate within 10-120 s windows at lags of up to ×40 min of observed γ-ray photons. The 95% upper limit for a γ-ray flux enhancement in pulsed emission phase window around GPs is 4 times the average pulsed γ-ray flux from the Crab. These results suggest that GPs, at least high-frequency IP GPs, are due to changes in coherence of radio emission rather than an overall increase in the magnetospheric particle density.
Also, we discuss the results of the correlation study between giant pulses from the Crab pulsar at 1.4 GHz and X-ray photons.
Bilous Anna
Kondratiev Vladimir
Langston Glen
Lyutikov Maxim
McLaughlin Mark Anthony
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