A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65
文献类型：期刊论文
| 作者 | Marchili, N.1,2; Krichbaum, T. P.1; Liu, X.3 ; Song, H. -G.3; Gabanyi, K. E.4,5; Fuhrmann, L.1; Witzel, A.1; Zensus, J. A.1
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2012-06-01 |
| 卷号 | 542页码:A121 |
| 关键词 | quasars: individual: S4 0954+65 scattering radio continuum: galaxies methods: data analysis |
| ISSN号 | 0004-6361 |
| 通讯作者 | marchili@mpifr-bonn.mpg.de |
| 合作状况 | 国际合作 |
| 英文摘要 | The BLLac object S4 0954+65 is one of the main targets of the Urumqi monitoring program targeting intraday variable (IDV) sources. Between August 2005 and December 2009, the source was included in 41 observing sessions, carried out at a frequency of 4.8 GHz. The time analysis of the collected light curves, performed by applying both a structure function analysis and a specifically developed wavelet-based algorithm, discovered an annual cycle in the variability timescales, suggesting that there is a fundamental contribution by interstellar scintillation to the IDV pattern of the source. The combined use of the two analysis methods also revealed that there was a dramatic change in the variability characteristics of the source between February and March 2008, at the starting time of a strong outburst phase. The analysis' results suggest that the flaring state of the source coincides with the appearance of multiple timescales in its light curves, indicating that changes in the structure of the relativistically moving emitting region may strongly influence the variability observed on IDV timescales. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | 星系和宇宙学 |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | EXTRAGALACTIC RADIO-SOURCES ; SCINTILLATION-INDUCED VARIABILITY ; EXTREME SCATTERING EVENTS ; RAPID VARIABILITY ; ANNUAL MODULATION ; INTERSTELLAR SCINTILLATION ; BL LACERTAE ; QUASAR ; J1819+3845 |
| 收录类别 | SCI |
| 资助信息 | ASI (I/005/11/0); Hungarian Scientific Research Fund (OTKA,K72515); National Natural Science Foundation of China (No.11073036); 973 Program of China (2009CB824800) |
| 原文出处 | http://www.aanda.org/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000305803300121 |
| 公开日期 | 2014-12-12 |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/418]  |
| 专题 | 星系宇宙学研究团组 射电天文研究室_利用南山26米射电望远镜观测数据的文章 |
| 作者单位 | 1.Max Planck Inst Radioastron, D-53121 Bonn, Germany 2.Univ Padua, Dipartimento Astron, I-35122 Padua, Italy 3.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China 4.Satellite Geodet Observ, FOMI, Budapest, Hungary 5.Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Konkoly Thege Miklos Astron Inst, H-1051 Budapest, Hungary |
| 推荐引用方式 GB/T 7714 | Marchili, N.,Krichbaum, T. P.,Liu, X.,et al. A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65[J]. ASTRONOMY & ASTROPHYSICS,2012,542:A121. |
| APA | Marchili, N..,Krichbaum, T. P..,Liu, X..,Song, H. -G..,Gabanyi, K. E..,...&Zensus, J. A..(2012).A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65.ASTRONOMY & ASTROPHYSICS,542,A121. |
| MLA | Marchili, N.,et al."A seasonal cycle and an abrupt change in the variability characteristics of the intraday variable source S4 0954+65".ASTRONOMY & ASTROPHYSICS 542(2012):A121. |
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来源：新疆天文台
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