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The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002
Villata, M; Raiteri, CM; Kurtanidze, OM; Nikolashvili, MG; Ibrahimov, MA; Papadakis, IE; Tosti, G; Hroch, F; Takalo, LO; Sillanpaa, A; Hagen-Thorn, VA; Larionov, VM; Schwartz, RD; Basler, J; Brown, LE; Balonek, TJ; Benitez, E; Ramirez, A; Sadun, AC; Boltwood, P; Carini, MT; Barnaby, D; Coloma, JM; Ros, JA; Dai BZ(戴本忠); Xie GZ(谢光中); Mattox, JR; Rodriguez, D; Asfandiyarov, IM; Atkerson, A; Bloom, SD; Chanturiya, SM; Ciprini, S; Crapanzano, S; de Diego, JA; Efimova, NV; Gardiol, D; Guerra, JC; Kahharov, BB; Kapanadze, BZ; Karttunen, H; Kato, T; Kimeridze, GN; Kudryavtseva, NA; Lainela, M; Lanteri, L; Larionova, EG; Maesano, M; Marchili, N; Massone, G; Monroe, T; Montagni, F; Nesci, R; Nilsson, K; Noble, JC; Nucciarelli, G; Ostorero, L; Papamastorakis, J; Pasanen, M; Peters, CS; Pursimo, T; Reig, P; Ryle, W; Sclavi, S; Sigua, LA; Uemura, M; Wills, W; Villata, M (reprint author), Osserv Astron Torino, INAF, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
发表期刊ASTRONOMY & ASTROPHYSICS
2004-07
卷号421期号:1页码:103-114
DOI10.1051/0004-6361:20035895
产权排序第21完成单位
收录类别SCI ; EI
关键词Galaxies : Active Galaxies : Bl Lacertae Objects : General Galaxies : Jets Galaxies : Quasars : General
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.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-6361
URL查看原文
归档日期2004-08-07
WOS记录号WOS:000222847800016
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]MICROVARIABILITY OBSERVATIONS ; VARIABILITY ; OUTBURST ; OBJECTS ; PERIODICITY ; GALAXIES ; MODELS
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文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6975
专题星系研究组
通讯作者Villata, M (reprint author), Osserv Astron Torino, INAF, Via Osservatorio 20, I-10025 Pino Torinese, Italy.
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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.,...&Villata, M .(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.
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