Variability investigation of quasars 4C 38.41 and 3C 345 at 92 cm: additional 14 observations
文献类型：期刊论文
| 作者 | Peng, B
|
| 刊名 | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
 |
| 出版日期 | 2002-02-21 |
| 卷号 | 330期号:2页码:344-348 |
| 关键词 | radiation mechanisms : non-thermal scattering methods : data analysis quasars : individual : 4C 38.41 quasars : individual : 3C 345 radio continuum : galaxies |
| 英文摘要 | 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. |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000174155100012 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/8543]  |
| 专题 | 国家天文台_射电天文研究部 |
| 作者单位 | Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China |
| 推荐引用方式 GB/T 7714 | 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. |
入库方式： OAI收割
来源：国家天文台
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