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The WEBT BL Lacertae Campaign 2001 and its extension - Optical light curves and colour analysis 1994-2002
Villata, M1; Raiteri, CM1; Kurtanidze, OM2,3,4; Nikolashvili, MG2; Ibrahimov, MA5; Papadakis, IE6,7; Tosti, G8; Hroch, F9; Takalo, LO10; Sillanpaa, A10; Hagen-Thorn, VA11,12; Larionov, VM11,12; Schwartz, RD13; Basler, J13; Brown, LF14; Balonek, TJ15; Benitez, E16; Ramirez, A16; Sadun, AC17; Boltwood, P18; Carini, MT19; Barnaby, D19; Coloma, JM20; Ros, JA20; Dai BZ(戴本忠)21,22,23; Xie GZ(谢光中)21,22,23; Mattox, JR24; Rodriguez, D25; Asfandiyarov, IM5; Atkerson, A19; Bloom, SD26; Chanturiya, SM2; Ciprini, S8; Crapanzano, S1; de Diego, JA16; Efimova, NV11; Gardiol, D1,27; Guerra, JC27; Kahharov, BB5; Kapanadze, BZ2; Karttunen, H10; Kato, T28; Kimeridze, GN2; Kudryavtseva, NA11; Lainela, M10; Lanteri, L1; Larionova, EG11; Maesano, M29; Marchili, N8; Massone, G1; Monroe, T19; Montagni, F30; Nesci, R31; Nilsson, K10; Noble, JC32; Nucciarelli, G8; Ostorero, L4,33; Papamastorakis, J6,7; Pasanen, M10; Peters, CS14; Pursimo, T34; Reig, P6,35; Ryle, W19; Sclavi, S31; Sigua, LA2; Uemura, M28; Wills, W19
Contribution Rank第21完成单位
Indexed BySCI ; EI
KeywordGalaxies : Active Galaxies : Bl Lacertae Objects : General Galaxies : Jets Galaxies : Quasars : General

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.

Subject Area天文学 ; 星系与宇宙学
MOST Discipline Catalogue理学 ; 理学::天文学
Archive Date2004-08-07
WOS IDWOS:000222847800016
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordMicrovariability Observations ; Variability ; Outburst ; Objects ; Periodicity ; Galaxies ; Models
EI Accession Number2004298263222
EI KeywordsRadio Astronomy
EI Classification Number932.3plasma Physics - 801chemistry - 741.3optical Devices And Systems - 741.1light/optics - 723.2data ProcessIng And Image ProcessIng - 716.3radio Systems And Equipment - 711.1electromagnetic Waves In Different Media - 701.2magnetism: Basic Concepts And Phenomena - 701.1electricity: Basic Concepts And Phenomena - 657.2extraterrestrial Physics And Stellar Phenomena - 655.2satellites
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Document Type期刊论文
Corresponding AuthorVillata, M
Affiliation1.Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese (TO), Italy
2.Abastumani Astrophysical Observatory, 383762 Abastumani, Georgia
3.Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
4.Landessternwarte Heidelberg-K., Königstuhl 12, 69117 Heidelberg, Germany
5.Ulugh Beg Astronomical Institute, Academy of Sciences of Uzbekistan, 33 Astronomical Str., Tashkent 700052, Uzbekistan
6.IESL, FORTH, 711 10 Heraklion, Crete, Greece
7.Physics Department, University of Crete, PO Box 2208, 710 03 Heraklion, Crete, Greece
8.Dipartimento di Fisica, Università di Perugia, Via A. Pascoli, 06123 Perugia, Italy
9.Inst. of Theor. Phys./Astrophysics, Faculty of Science, Masaryk University, Kotlárˇská 2, 611 37 Brno, Czech Republic
10.Tuorla Observatory, 21500 Piikkiö, Finland
11.Astronomical Institute, St.-Petersburg State University, Universitetsky Pr. 28, Petrodvoretz, 198504 St.-Petersburg, Russia
12.Isaac Newton Institute of Chile, St.-Petersburg Branch, Russia
13.Department of Physics, University of Missouri-St. Louis, 8001 Natural Bridge Road, St. Louis, MO 63121, United States
14.Department of Physics, Connecticut College, New London, CT 06320, United States
15.Foggy Bottom Observatory, Colgate University, 13 Oak Drive, Hamilton, NY 13346, United States
16.Instituto de Astronomía, UNAM, Apdo. Postal 70-264, 04510 México DF, Mexico
17.Department of Physics, University of Colorado at Denver, PO Box 173364, Denver, CO 80217-3364, United States
18.Boltwood Observatory, 1655 Main Street, Stittsville, Ont. K2S 1N6, Canada
19.Department of Physics, Western Kentucky University, 1 Big Red Way, Bowling Green, KY 42104, United States
20.Agrupacio Astronomica de Sabadell, PO Box 50, 08200 Sabadell, Spain
21.Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, PO Box 110, Kunming 650011, China
22.U. Laboratory of Optical Astronomy, Chinese Academy of Sciences, Beijing, China
23.Yunnan Astrophysics Center, Yunnan University, Kunming 650091, China
24.Department of Natural Sciences, Fayetteville State University, 1200 Murchison Road, Fayetteville, NC 28301, United States
25.Guadarrama Observatory, C/San Pablo 5, Villalba 28409, Madrid, Spain
26.Department of Physics, Hampden-Sydney College, Hampden-Sydney, VA 23943, United States
27.Istituto Nazionale di Astrofisica, Telescopic Nazionale Galileo, Roque Los Muchachos Astron. Observ., PO Box 565, 38700 Santa Cruz de La Palma, TF, Spain
28.Department of Astronomy, Faculty of Science, Kyoto University, Kyoto, Japan
29.Stazione Astronomica Vallinfreda, Italy
30.Stazione Astronomica Greve, Chianti, Italy
31.Dipartimento di Fisica, Università La Sapienza, Piazzale A. Moro 2, 00185 Roma, Italy
32.Institute for Astrophysical Research, Boston University, 725 Commonwealth Ave., Boston, MA 02215, United States
33.Dipartimento di Fisica Generale, Università di Torino, via P. Giuria 1, 10125 Torino, Italy
34.Nordic Optical Telescope, Roque Los Muchachos Astron. Observ., PO Box 474, 38700 Santa Cruz de La Palma, TF, Spain
35.G.A.C.E., Departament d'Astronomia, Universitat de València, 46071 Paterna-València, Spain
Recommended Citation
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.
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