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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.
In:
Astronomy and Astrophysics, Vol. 421, No. 1, 01.07.2004, p. 103-114.
Research output: Contribution to journal › Article › peer-review
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, vol. 421, no. 1, pp. 103-114.
https://doi.org/10.1051/0004-6361:20035895,
https://doi.org/10.1051/0004-6361:20035895APA
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/10.1051/0004-6361:20035895Vancouver
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. In:
Astronomy and Astrophysics. 2004 ; Vol. 421, No. 1. pp. 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 -
