The Crab and VELA gamma ray nebulae.

Details The Crab and VELA gamma ray nebulae. The Crab and VELA gamma ray nebulae.

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26as..120c.441d&link_type=abstract

Astronomy and Astrophysics Supplement, v.120, p.441-444

Astronomy and Astrophysics

Astrophysics

9

Ism: Individual Objects: Crab Nebula, Vela Snr, Ism: Magnetic Fields, Gamma Rays: Observations, Gamma Rays: Theory

Scientific paper

COMPTEL/EGRET observations of the Crab unpulsed component indicates that the 1-150MeV emission is variable with a photon spectrum of the form ~E^-1.7^exp((-E/25)MeV), which does not connect smoothly with the spectrum outside this interval. This hints at an independent synchrotron emission feature in the Crab Nebula. The flux in the 0.3-10GeV interval is a factor ~3 larger than the predicted inverse Compton flux, which indicates that the field in the outer nebula decreases faster than predicted by MHD flow soultions. The OSSE detection of the Vela SNR is (spectrally) consistent with emission from the 1' radius compact nebula. The EGRET upper limit constrains the maximum particle energy in this compact nebula to values below the full polar cap potential drop. However, inverse Compton emission from the Vela X radio nebula is also expected in the EGRET range, leading to a constraint on the radio break frequency and nebular magnetic field strength.

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