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The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002. / Villata, M.; Raiteri, C. M.; Kurtanidze, O. M.; Nikolashvili, M. G.; Ibrahimov, M. A.; Papadakis, I. E.; Tosti, G.; Hroch, F.; Takalo, L. O.; Sillanpää, A.; Hagen-Thorn, V. A.; Larionov, V. M.; Schwartz, R. D.; Basler, J.; Brown, L. F.; Balonek, T. J.; Benítez, E.; Ramírez, A.; Sadun, A. C.; Boltwood, P.; Carini, M. T.; Barnaby, D.; Coloma, J. M.; Ros, J. A.; Dai, B. Z.; Xie, G. Z.; Mattox, J. R.; Rodriguez, D.; Asfandiyarov, I. M.; Atkerson, A.; Beem, J. L.; Bloom, S. D.; Chanturiya, S. M.; Ciprini, S.; Crapanzano, S.; De Diego, J. A.; Efimova, N. V.; Gardiol, D.; Guerra, J. C.; Kahharov, B. B.; Kapanadze, B. Z.; Karttunen, H.; Kato, T.; Kimeridze, G. N.; Kudryavtseva, N. A.; Lainela, M.; Lanteri, L.; Larionova, E. G.; Maesano, M.; Marchili, N.; Massone, G.; Monroe, T.; Montagni, F.; Nesci, R.; Nilsson, K.; Noble, J. C.; Nucciarelli, G.; Ostorero, L.; Papamastorakis, J.; Pasanen, M.; Peters, C. S.; Pursimo, T.; Reig, P.; Ryle, W.; Sclavi, S.; Sigua, L. A.; Uemura, M.; Wills, W.

в: Astronomy and Astrophysics, Том 421, № 1, 01.07.2004, стр. 103-114.

Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование

Harvard

Villata, M, Raiteri, CM, Kurtanidze, OM, Nikolashvili, MG, Ibrahimov, MA, Papadakis, IE, Tosti, G, Hroch, F, Takalo, LO, Sillanpää, A, Hagen-Thorn, VA, Larionov, VM, Schwartz, RD, Basler, J, Brown, LF, Balonek, TJ, Benítez, E, Ramírez, A, Sadun, AC, Boltwood, P, Carini, MT, Barnaby, D, Coloma, JM, Ros, JA, Dai, BZ, Xie, GZ, Mattox, JR, Rodriguez, D, Asfandiyarov, IM, Atkerson, A, Beem, JL, 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 2004, 'The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002', Astronomy and Astrophysics, Том. 421, № 1, стр. 103-114. https://doi.org/10.1051/0004-6361:20035895, https://doi.org/10.1051/0004-6361:20035895

APA

Villata, M., Raiteri, C. M., Kurtanidze, O. M., Nikolashvili, M. G., Ibrahimov, M. A., Papadakis, I. E., Tosti, G., Hroch, F., Takalo, L. O., Sillanpää, A., Hagen-Thorn, V. A., Larionov, V. M., Schwartz, R. D., Basler, J., Brown, L. F., Balonek, T. J., Benítez, E., Ramírez, A., Sadun, A. C., ... Wills, W. (2004). The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002. Astronomy and Astrophysics, 421(1), 103-114. https://doi.org/10.1051/0004-6361:20035895, https://doi.org/10.1051/0004-6361:20035895

Vancouver

Villata M, Raiteri CM, Kurtanidze OM, Nikolashvili MG, Ibrahimov MA, Papadakis IE и пр. The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002. Astronomy and Astrophysics. 2004 Июль 1;421(1):103-114. https://doi.org/10.1051/0004-6361:20035895, https://doi.org/10.1051/0004-6361:20035895

Author

Villata, M. ; Raiteri, C. M. ; Kurtanidze, O. M. ; Nikolashvili, M. G. ; Ibrahimov, M. A. ; Papadakis, I. E. ; Tosti, G. ; Hroch, F. ; Takalo, L. O. ; Sillanpää, A. ; Hagen-Thorn, V. A. ; Larionov, V. M. ; Schwartz, R. D. ; Basler, J. ; Brown, L. F. ; Balonek, T. J. ; Benítez, E. ; Ramírez, A. ; Sadun, A. C. ; Boltwood, P. ; Carini, M. T. ; Barnaby, D. ; Coloma, J. M. ; Ros, J. A. ; Dai, B. Z. ; Xie, G. Z. ; Mattox, J. R. ; Rodriguez, D. ; Asfandiyarov, I. M. ; Atkerson, A. ; Beem, J. L. ; Bloom, S. D. ; Chanturiya, S. M. ; Ciprini, S. ; Crapanzano, S. ; De Diego, J. A. ; Efimova, N. V. ; Gardiol, D. ; Guerra, J. C. ; Kahharov, B. B. ; Kapanadze, B. Z. ; Karttunen, H. ; Kato, T. ; Kimeridze, G. N. ; Kudryavtseva, N. A. ; Lainela, M. ; Lanteri, L. ; Larionova, E. G. ; Maesano, M. ; Marchili, N. ; Massone, G. ; Monroe, T. ; Montagni, F. ; Nesci, R. ; Nilsson, K. ; Noble, J. C. ; Nucciarelli, G. ; Ostorero, L. ; Papamastorakis, J. ; Pasanen, M. ; Peters, C. S. ; Pursimo, T. ; Reig, P. ; Ryle, W. ; Sclavi, S. ; Sigua, L. A. ; Uemura, M. ; Wills, W. / The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002. в: Astronomy and Astrophysics. 2004 ; Том 421, № 1. стр. 103-114.

BibTeX

@article{ef3e03cb0a4a4720810cfedbe302a195,
title = "The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002",
abstract = "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 ∼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 ∼0.1 bluer-when-brighter slope in the B - R versus R plane; a steeper slope of ∼0.4 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 ∼1.1. Doppler factor variations on a {"}convex{"} spectrum could be the mechanism accounting for both the long-term variations and their slight chromatism.",
keywords = "Galaxies: active, Galaxies: BL Lacertae objects: general, Galaxies: jets, Galaxies: quasars: general",
author = "M. Villata and Raiteri, {C. M.} and Kurtanidze, {O. M.} and Nikolashvili, {M. G.} and Ibrahimov, {M. A.} and Papadakis, {I. E.} and G. Tosti and F. Hroch and Takalo, {L. O.} and A. Sillanp{\"a}{\"a} and Hagen-Thorn, {V. A.} and Larionov, {V. M.} and Schwartz, {R. D.} and J. Basler and Brown, {L. F.} and Balonek, {T. J.} and E. Ben{\'i}tez and A. Ram{\'i}rez and Sadun, {A. C.} and P. Boltwood and Carini, {M. T.} and D. Barnaby and Coloma, {J. M.} and Ros, {J. A.} and Dai, {B. Z.} and Xie, {G. Z.} and Mattox, {J. R.} and D. Rodriguez and Asfandiyarov, {I. M.} and A. Atkerson and Beem, {J. L.} and Bloom, {S. D.} and Chanturiya, {S. M.} and S. Ciprini and S. Crapanzano and {De Diego}, {J. A.} and Efimova, {N. V.} and D. Gardiol and Guerra, {J. C.} and Kahharov, {B. B.} and Kapanadze, {B. Z.} and H. Karttunen and T. Kato and Kimeridze, {G. N.} and Kudryavtseva, {N. A.} and M. Lainela and L. Lanteri and Larionova, {E. G.} and M. Maesano and N. Marchili and G. Massone and T. Monroe and F. Montagni and R. Nesci and K. Nilsson and Noble, {J. C.} and G. Nucciarelli and L. Ostorero and J. Papamastorakis and M. Pasanen and Peters, {C. S.} and T. Pursimo and P. Reig and W. Ryle and S. Sclavi and Sigua, {L. A.} and M. Uemura and W. Wills",
year = "2004",
month = jul,
day = "1",
doi = "10.1051/0004-6361:20035895",
language = "English",
volume = "421",
pages = "103--114",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "0004-6361",
publisher = "EDP Sciences",
number = "1",

}

RIS

TY - JOUR

T1 - The WEBT BL Lacertae Campaign 2001 and its extension optical light curves and colour analysis 1994-2002

AU - Villata, M.

AU - Raiteri, C. M.

AU - Kurtanidze, O. M.

AU - Nikolashvili, M. G.

AU - Ibrahimov, M. A.

AU - Papadakis, I. E.

AU - Tosti, G.

AU - Hroch, F.

AU - Takalo, L. O.

AU - Sillanpää, A.

AU - Hagen-Thorn, V. A.

AU - Larionov, V. M.

AU - Schwartz, R. D.

AU - Basler, J.

AU - Brown, L. F.

AU - Balonek, T. J.

AU - Benítez, E.

AU - Ramírez, A.

AU - Sadun, A. C.

AU - Boltwood, P.

AU - Carini, M. T.

AU - Barnaby, D.

AU - Coloma, J. M.

AU - Ros, J. A.

AU - Dai, B. Z.

AU - Xie, G. Z.

AU - Mattox, J. R.

AU - Rodriguez, D.

AU - Asfandiyarov, I. M.

AU - Atkerson, A.

AU - Beem, J. L.

AU - Bloom, S. D.

AU - Chanturiya, S. M.

AU - Ciprini, S.

AU - Crapanzano, S.

AU - De Diego, J. A.

AU - Efimova, N. V.

AU - Gardiol, D.

AU - Guerra, J. C.

AU - Kahharov, B. B.

AU - Kapanadze, B. Z.

AU - Karttunen, H.

AU - Kato, T.

AU - Kimeridze, G. N.

AU - Kudryavtseva, N. A.

AU - Lainela, M.

AU - Lanteri, L.

AU - Larionova, E. G.

AU - Maesano, M.

AU - Marchili, N.

AU - Massone, G.

AU - Monroe, T.

AU - Montagni, F.

AU - Nesci, R.

AU - Nilsson, K.

AU - Noble, J. C.

AU - Nucciarelli, G.

AU - Ostorero, L.

AU - Papamastorakis, J.

AU - Pasanen, M.

AU - Peters, C. S.

AU - Pursimo, T.

AU - Reig, P.

AU - Ryle, W.

AU - Sclavi, S.

AU - Sigua, L. A.

AU - Uemura, M.

AU - Wills, W.

PY - 2004/7/1

Y1 - 2004/7/1

N2 - 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 ∼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 ∼0.1 bluer-when-brighter slope in the B - R versus R plane; a steeper slope of ∼0.4 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 ∼1.1. Doppler factor variations on a "convex" spectrum could be the mechanism accounting for both the long-term variations and their slight chromatism.

AB - 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 ∼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 ∼0.1 bluer-when-brighter slope in the B - R versus R plane; a steeper slope of ∼0.4 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 ∼1.1. Doppler factor variations on a "convex" spectrum could be the mechanism accounting for both the long-term variations and their slight chromatism.

KW - Galaxies: active

KW - Galaxies: BL Lacertae objects: general

KW - Galaxies: jets

KW - Galaxies: quasars: general

UR - http://www.scopus.com/inward/record.url?scp=3042582248&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20035895

DO - 10.1051/0004-6361:20035895

M3 - Article

VL - 421

SP - 103

EP - 114

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

IS - 1

ER -

ID: 17059078