期刊
ASTROPHYSICAL JOURNAL
卷 780, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/780/1/64
关键词
acceleration of particles; BL Lacertae objects: individual (1ES 1101-232, Mrk 421); radiation mechanisms: non-thermal; turbulence
资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan [25400227, 24540258]
- JSPS Research Fellowships for Young Scientists [231446]
- Grants-in-Aid for Scientific Research [24540258] Funding Source: KAKEN
The second-order Fermi acceleration (Fermi-II) driven by turbulence may be responsible for the electron acceleration in blazar jets. We test this model with time-dependent simulations. The hard electron spectrum predicted by the Fermi-II process agrees with the hard photon spectrum of 1ES 1101-232. For other blazars that show softer spectra, the Fermi-II model requires radial evolution of the electron injection rate and/or diffusion coefficient in the outflow. Such evolutions can yield a curved electron spectrum, which can reproduce the synchrotron spectrum of Mrk 421 from the radio to the X-ray regime. The photon spectrum in the GeV energy range of Mrk 421 is hard to fit with a synchrotron self-Compton model. However, if we introduce an external radio photon field with a luminosity of 4.9 x 10(38) erg s(-1), GeV photons are successfully produced via inverse Compton scattering. The temporal variability of the diffusion coefficient or injection rate causes flare emission. The observed synchronicity of X-ray and TeV flares implies a decrease of the magnetic field in the flaring source region.
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