High-Energy Astrophysics American and Soviet Perspectives/Proceedings from the U.S.-U.S.S.R. Workshop on High-Energy Astrophysics (1991) / Chapter Skim
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GENERATION OF ULTRAHIGH-ENERGY GAMMA-RAYS IN ACCRETING X-RAY PULSARS
GENERATION OF ULTRAHIGH-ENERGY GAMMA-RAYS IN ACCRETING X-RAY PULSARS
Pages 144-152
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From page 144... ...
The high efficiency of He accreting matter's gravitational energy conversion into the acceleration energy and high efficiency of the acceleration itself are the mam peculiarities of the considered mechanism. It Is shown that a distribution of the "loss cone" type accreting protons takes place during accretion onto a neutron star with a strong magnetic field.
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From page 145... ...
Thus, relativistic protons and electrons originating very high-energy gamma rays should generate close to the neutron star's surface as a result of accretion. At present there is no general theoretical conception of the mechanism of relativistic proton generation near the surface of the Secreting neutron star, although there are quite a few ideas (see Brecher 1987; Hillas 1987~.
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From page 146... ...
, _ ~_ o o o o _ _ _ _ ~o ~ o o o _ _ _ _ 1 1 1 1 o o o ~ _ _ '_ _ C~ C~ C ~o~ C7` oo ~, ~ ~t _ ~o 8 _ C ~o o C~ ~o _ _ , ~o C} := - t~ X X a~ e~s ;> ~ C, ~; _ _ C _O _ .
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From page 147... ...
The accreting plasma automatically becomes essentially mhomogeneous. MEClIANISM OF lam CONVERSION OF GRAVITATIONAL ENERGY TO ULTRA-REIATIVISTIC PROTON ENERGY lithe idea of the proposed mechanism lies in the assertion that a distribution of accreting protons of "the loss cone" type takes place during accretion onto the neutron star with a strong magnetic field (Leroy and Mangeney 1984; Benz and Thejappa 1989~.
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From page 148... ...
The generated waves become more intensive in direction close to that of the magnetic field lines: Kit < (~/wB~/2. On the Aliven surface VA ~ Vff and w ~ Alibi, be., ion cyclotron waves are effectively generated.
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From page 149... ...
The mechanism of soliton dissipation is widetr discussed in scientific literature, although the problem has not yet been finally solved. We can put down the final conclusion as follows: the conversion of the accreting flux gravitational energy into the ultrarelativistic particle energy as a result of the development of the "loss cone" type instability (43 takes place at a characteristic distance to the neutron star.
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From page 150... ...
The neutrons are formed in the generation region as a result of nuclear collisions formed in the generation region as a result of nuclear collisions of ultrarelativistic protons with the surrounding plasma. In conclusion, we would like to emphasize the fact that soliton mechanism explains also the freezing-in of the Secreting plasma to the strong magnetic field of the neutron star, since the magnetic field will penetrate quickly to plasma blobs, formed by solitons.
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From page 151... ...
the Elfin radius RA ~ RS, which corresponds to the value of the magnetic field on the neutron starts surface Bs ~ 109 Gauss. This result is well confirmed by the recent observational data, which indicate that the neutron star in the Cyg X-3 system is a millisecond pulsar (Watson 1987; Zyskin et al.
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From page 152... ...
(ed.~. Very High Energy Gamma Ray Astronomy.
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