highbrightnesstemperaturesinidvsources

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	highbrightnesstemperaturesinidvsources
	Shanjie Qian 2; TP Krichbaum 1; A Witel 1; JA Zensus 1; Xizhen Zhang 2
刊名	chinesejournalofastronomyandastrophysics
	2006
卷号	6 期号:5 页码:530
ISSN号	1009-9271
英文摘要	High brightness temperatures are a characteristic feature of IntraDay Variability (IDV) of extragalactic radio sources. Recent studies of the polarization properties of some IDV sources (e.g., 1150+812, PKS 0405-385 and 0716+714) have shown that these sources harbor several compact IDV components with angular sizes of similar to 10-30 mu as and very high polarizations (of up to similar to 50%-70%). These results indicate the possibility of the existence of uniform magnetic fields in the IDV components. We investigate the incoherent synchrotron and self- Compton radiation of an anisotropic distribution of relativistic electrons which spin around the magnetic field lines at small pitch angles. The brightness temperature limit caused by second-order Compton losses is discussed and compared to the brightness temperatures derived from energy equipartition arguments. It is found that anisotropic distributions of electrons moving in ordered magnetic fields can raise the equipartition and Compton brightness temperatures by a factor of up to similar to 3-5. This would remove some of the difficulties in the interpretation of extremely high intrinsic brightness temperatures of > 10(12) K (or apparent brightness temperatures of similar to 10(14) K with a Doppler factor of similar to 30).
语种	英语
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/51420]
专题	中国科学院国家天文台
作者单位	1.德国马普学会射电天文学研究所 2.中国科学院国家天文台
推荐引用方式 GB/T 7714	Shanjie Qian,TP Krichbaum,A Witel,et al. highbrightnesstemperaturesinidvsources[J]. chinesejournalofastronomyandastrophysics,2006,6(5):530.
APA	Shanjie Qian,TP Krichbaum,A Witel,JA Zensus,&Xizhen Zhang.(2006).highbrightnesstemperaturesinidvsources.chinesejournalofastronomyandastrophysics,6(5),530.
MLA	Shanjie Qian,et al."highbrightnesstemperaturesinidvsources".chinesejournalofastronomyandastrophysics 6.5(2006):530.