Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994ap%26ss.213..257w&link_type=abstract
Astrophysics and Space Science, vol. 213, no. 2, p. 257-271
Astronomy and Astrophysics
Astrophysics
Bl Lacertae Objects, Coherent Electromagnetic Radiation, Free Jets, Relativistic Electron Beams, Stellar Mass Ejection, Synchrotron Radiation, Jet Flow, Lorentz Gas, Polarized Electromagnetic Radiation, Pulsar Magnetospheres, Stellar Magnetic Fields
Scientific paper
On the basis of issues raised by observations of BL Lac objects and the qualitative jet model proposed by Baker et al. in 1988, we have been led to consider the quantitative role of coherent, stimulated emission in jets and construct a new jet model of blazars in which a relativistic electron beam with an axial symmetric, power-law distribution is injected from the central engine into the jet plasma. We study quantitatively the synchrotron emission of the relativistic electron beams. Using the weak turbulent theory of plasma, we discuss the interaction between relativistic electron beams and jet plasma, and the roles of stimulated emission. The main results are: (1) The synchrotron emission increases sensitively with the increase of the angle between the direction of the beam and the magnetic field. When the direction of the beam is vertical to the magnetic field, the synchrotron emission reaches its maximum, i.e. the emitted waves are beamed in the direction of the jet axis. We suggest that radio selected BL Lac objects belong to this extreme classification. (2) The synchrotron emission of the relativistic beam increases rapidly with the increase of the Lorentz factor of the relativistic electron, gamma, when gamma less than or equal to 22.5, then decreases rapidly with increase of gamma. (3) The stimulated emission also increases with increasing Lorentz factor gamma of the relativistic electrons when gamma less than or equal to 35 and then decreases with the increasing gamma. The maximum stimulated emission a nd the maximum synchrotron emission occur at different frequencies. Stimulated emission is probably very important and reasonable flare mechanism in blazars. (4) The rapid polarization position angle (PA) swings may arise from the interaction between the relativistic electron beam and the turbulent plasma.
Joseph Wang C.-C.
Lin Juhn-Jong
Xie G.-Zh.
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