期刊论文详细信息
Publications of the Astronomical Society of Australia | |
Broad-band Radio Spectra Variability of 550 AGN in 1997-2001 | |
Y. Y. Kovalev1  | |
[1]Yu A. Kovalev | |
关键词: galaxies: active; galaxies: jets; BL Lacertae objects: general; quasars: general; radio continuum: galaxies; | |
DOI : 10.1071/AS01109 | |
学科分类:天文学(综合) | |
来源: CSIRO | |
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【 摘 要 】
Results are presented of long-term monitoring at the radio telescope RATAN–600 and a model interpretation of instantaneous 1–22 GHz spectra at six frequencies for a sample of 550 compact extragalactic radio sources. The sources are selected from the Preston et al. (1985) VLBI survey and are located in the declination range from −30° to +43°. Dependence of the index of variability on frequency is analysed for different subsamples. Factors of flux density variations range from 1 to 15. A typical behaviour of spectra evolution during strong radio outbursts in various objects is recognised suggesting a common physical nature of the variability. Invoking VLBI observations in spectra–structure analysis, we find that usually more than 70% of the total emission is coming from the mas scale at frequencies higher than 5 GHz. The observed variability can be explained in the model with a relativistic jet of parsec scale in the longitudinal magnetic field or in the shock-in-jet model.【 授权许可】
Unknown
【 预 览 】
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RO201912040531725ZK.pdf | 355KB | ![]() |