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The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002
文献类型：期刊论文
| 作者 | Villata, M; Raiteri, CM; Kurtanidze, OM; Nikolashvili, MG; Ibrahimov, MA; Papadakis, IE; Tosti, G; Hroch, F; Takalo, LO; Sillanpaa, A |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2004-07 |
| 卷号 | 421期号:1页码:103-114 |
| 关键词 | galaxies : active galaxies : BL Lacertae objects : general galaxies : jets galaxies : quasars : general |
| ISSN号 | 0004-6361 |
| 产权排序 | 第二十一完成单位 |
| 通讯作者 | Villata, M (reprint author), Osserv Astron Torino, INAF, Via Osservatorio 20, I-10025 Pino Torinese, Italy. |
| 英文摘要 | BL Lacertae has been the target of four observing campaigns by the Whole Earth Blazar Telescope (WEBT) collaboration. In this paper we present UBVRI light curves obtained by the WEBT from 1994 to 2002, including the last, extended BL Lac 2001 campaign. A total of about 7500 optical observations performed by 31 telescopes from Japan to Mexico have been collected, to be added to the similar to 15 600 observations of the BL Lac Campaign 2000. All these data allow one to follow the source optical emission behaviour with unprecedented detail. The analysis of the colour indices reveals that the flux variability can be interpreted in terms of two components: longer-term variations occurring on a few-day time scale appear as mildly-chromatic events, while a strong bluer-when-brighter chromatism characterizes very fast (intraday) flares. By decoupling the two components, we quantify the degree of chromatism inferring that longer-term flux changes imply moving along a similar to0.1 bluer-when-brighter slope in the B-R versus R plane; a steeper slope of similar to0.4 would distinguish the shorter-term variations. This means that, when considering the long-term trend, the B-band flux level is related to the R-band one according to a power law of index similar to1.1. Doppler factor variations on a "convex" spectrum could be the mechanism accounting for both the long-term variations and their slight chromatism. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | MICROVARIABILITY OBSERVATIONS ; VARIABILITY ; OUTBURST ; OBJECTS ; PERIODICITY ; GALAXIES ; MODELS |
| 收录类别 | SCI ; EI |
| 原文出处 | http://www.aanda.org/articles/aa/abs/2004/25/aa0895/aa0895.html |
| 语种 | 英语 |
| WOS记录号 | WOS:000222847800016 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/6975]  |
| 专题 | 云南天文台_星系研究组 |
| 推荐引用方式 GB/T 7714 | Villata, M,Raiteri, CM,Kurtanidze, OM,et al. The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002[J]. ASTRONOMY & ASTROPHYSICS,2004,421(1):103-114. |
| APA | Villata, M.,Raiteri, CM.,Kurtanidze, OM.,Nikolashvili, MG.,Ibrahimov, MA.,...&Wills, W.(2004).The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002.ASTRONOMY & ASTROPHYSICS,421(1),103-114. |
| MLA | Villata, M,et al."The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002".ASTRONOMY & ASTROPHYSICS 421.1(2004):103-114. |
入库方式： OAI收割
来源：云南天文台
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