On the origin of extragalactic γ-ray bursters.

Details On the origin of extragalactic γ-ray bursters. On the origin of extragalactic γ-ray bursters.

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...290..364r&link_type=abstract

Astronomy and Astrophysics 290, 364-370 (1994)

Astronomy and Astrophysics

Astrophysics

16

{Gamma}-Ray Bursts, Radiation Mechanism: Non-Thermal, Galaxies: Jets, Galaxies: Nuclei, {Gamma}-Rays: Theory

Scientific paper

In the frame of the two-fluid model of extragalactic radio sources, the properties of extragalactic γ-ray bursters can be explained by the emission of a precessing relativistic e^+/-^ beam whose bulk Lorentz factor is γ_b_=~10. The γ-ray emission of the ejected e^+/-^ component has a non-thermal origin and is due to the e^+/-^ annihilations and the inverse Compton losses. Due to the relativistic motion of the e^+/-^ component, its emission is strongly anisotropic. When several peaks are observed, the typical time scale between the peaks is of a few seconds and it corresponds to a perturbation period of the beam of about P_o_=~100s. This high frequency perturbation corresponds to the rotation frequency of a compact object turning at almost 3 Schwarzschild radii around a central black hole of mass 10^5^Msun_<=M<=10^6^Msun_. The rotating compact object perturbs the accretion disk around the black hole and the frozen magnetic field of the jet. It induces a precession of the beam and an e^+/-^ component is ejected relativistically in the precessing beam producing a γ-ray emission which appears to be pulsating for the observer. Due to the rotation of the compact object the system emits gravitational waves together with the γ-ray emission. Finally, γ-ray bursters are associated with distant normal galaxies and after few months we expect an anisotropic radio emission whose flux density is Snu_<=0.15mJy if the redshift of the galaxy is z>=0.2.

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