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Variability investigation of quasars 4C 38.41 and 3C 345 at 92 cm: additional 14 observations
Peng, B
2002-02-21
发表期刊MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷号330期号:2页码:344-348
摘要This paper provides additional evidence for the variability of the quasar 4C 38.41 based on 14 short observations at 92 cm using the Westerbork Synthesis Radio Telescope (WSRT). A fractional variability of 11.6 per cent was observed during the periods of 1989 May and from 1992 December to 1993 May. A brightness temperature or T-B similar to 2.6 or 5.2 x 10(18) delta(-3) K in 4C 38.41 can be estimated in the comoving frame, far in excess of the inverse Compton limit 10(12) K. A Doppler factor of delta greater than or equal to 138 would be required by invoking the relativistic bulk motion. Combining the published six Westerbork North Sky Survey (WENSS) mosaic data at 92 cm, we conclude that 4C 38.41 has significant variability, which is unlikely to be caused by propagation effects. No variability was found for the quasar 3C 345.
关键词Radiation Mechanisms : Non-thermal Scattering Methods : Data Analysis Quasars : Individual : 4c 38.41 Quasars : Individual : 3c 345 Radio Continuum : Galaxies
收录类别SCI
语种英语
WOS记录号WOS:000174155100012
引用统计
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/8543
专题射电天文研究部
作者单位Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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Peng, B. Variability investigation of quasars 4C 38.41 and 3C 345 at 92 cm: additional 14 observations[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2002,330(2):344-348.
APA Peng, B.(2002).Variability investigation of quasars 4C 38.41 and 3C 345 at 92 cm: additional 14 observations.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,330(2),344-348.
MLA Peng, B."Variability investigation of quasars 4C 38.41 and 3C 345 at 92 cm: additional 14 observations".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 330.2(2002):344-348.
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