Precessing Gamma jets,GRB and the twin rings around SN1987A |
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| Authors: | D Fargion A Salis |
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| Institution: | (1) Physics Dept. Rome Univ.1, P.le A.Moro 2, 00185 Rome, Italy |
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| Abstract: | Gamma jets (GJ) at MeV energies may be produced in galactic halos by Inverse Compton Scattering (ICS) of collinear ultrarelativistic electron beams (at GeV energies) onto thermal photons. These electron jets are emitted by neutron star jets (NSJ) or black holes (BH) while the target thermal photons are generated by a nearby binary stellarlike companion (or by a relic accreting disk). The GJ precesses in a conical shape as a lighthouse (with a characteristic Keplerian binary period) forced by the NSJ magnetic lines interaction with the stellar companion ones. The sudden blazing of the GJ, once the observer is into the beam cone direction, is detected as a GRB. Our predicted GRB spectra fit the GRB observed ones; GRB luminosity, variability and counts are well explained if the GJ sources are located in an  extended and an evaporating galactic halo as the one recently required in the fast running away NS model. Observed jets such as SS433, the Great Annihilator, superluminal sources such as the last GRS1758-258, GRS1915+105 are the ideal candidates for NSJ as well as GJ. The SGRs are the lower energy and wider beamed version of this GJ model so they are linked to classical GRBs. The last mysterious presence of the twin rings near SN1987A (as well as the ring traces near NGC6543) are the spectacular signature of such (double sided) conical jet precession projected onto the red giant relic spherical shell. The tiny but very puzzling offaxis nature of the SN1987A twin rings is due to the high eccentricity of the binary NSJ. The GRBs from the nearby Andromeda halo might be detected as soon as the instrumental sensitivity is increased. |
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