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The WEBT BL Lacertae campaign 2000. / Villata, M.; Raiteri, C. M.; Kurtanidze, O. M.; Nikolashvili, M. G.; Ibrahimov, M. A.; Papadakis, I. E.; Tsinganos, K.; Sadakane, K.; Okada, N.; Takalo, L. O.; Sillanpää, A.; Tosti, G.; Ciprini, S.; Frasca, A.; Marilli, E.; Robb, R. M.; Noble, J. C.; Jorstad, S. G.; Hagen-Thorn, V. A.; Larionov, V. M.; Nesci, R.; Maesano, M.; Schwartz, R. D.; Basler, J.; Gorham, P. W.; Iwamatsu, H.; Kato, T.; Pullen, C.; Benítez, E.; De Diego, J. A.; Moilanen, M.; Oksanen, A.; Rodriguez, D.; Sadun, A. C.; Kelly, M.; Carini, M. T.; Miller, H. R.; Catalano, S.; Dultzin-Hacyan, D.; Fan, J. H.; Ishioka, R.; Karttunen, H.; Keinänen, P.; Kudryavtseva, N. A.; Lainela, M.; Lanteri, L.; Larionov, E. G.; Matsumoto, K.; Mattox, J. R.; Montagni, F.; Nucciarelli, G.; Ostorero, L.; Papamastorakis, J.; Pasanen, M.; Sobrito, G.; Uemura, M.

в: Astronomy and Astrophysics, Том 390, № 2, 08.2002, стр. 407-421.

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

Harvard

Villata, M, Raiteri, CM, Kurtanidze, OM, Nikolashvili, MG, Ibrahimov, MA, Papadakis, IE, Tsinganos, K, Sadakane, K, Okada, N, Takalo, LO, Sillanpää, A, Tosti, G, Ciprini, S, Frasca, A, Marilli, E, Robb, RM, Noble, JC, Jorstad, SG, Hagen-Thorn, VA, Larionov, VM, Nesci, R, Maesano, M, Schwartz, RD, Basler, J, Gorham, PW, Iwamatsu, H, Kato, T, Pullen, C, Benítez, E, De Diego, JA, Moilanen, M, Oksanen, A, Rodriguez, D, Sadun, AC, Kelly, M, Carini, MT, Miller, HR, Catalano, S, Dultzin-Hacyan, D, Fan, JH, Ishioka, R, Karttunen, H, Keinänen, P, Kudryavtseva, NA, Lainela, M, Lanteri, L, Larionov, EG, Matsumoto, K, Mattox, JR, Montagni, F, Nucciarelli, G, Ostorero, L, Papamastorakis, J, Pasanen, M, Sobrito, G & Uemura, M 2002, 'The WEBT BL Lacertae campaign 2000', Astronomy and Astrophysics, Том. 390, № 2, стр. 407-421. https://doi.org/10.1051/0004-6361:20020662, https://doi.org/10.1051/0004-6361:20020662

APA

Villata, M., Raiteri, C. M., Kurtanidze, O. M., Nikolashvili, M. G., Ibrahimov, M. A., Papadakis, I. E., Tsinganos, K., Sadakane, K., Okada, N., Takalo, L. O., Sillanpää, A., Tosti, G., Ciprini, S., Frasca, A., Marilli, E., Robb, R. M., Noble, J. C., Jorstad, S. G., Hagen-Thorn, V. A., ... Uemura, M. (2002). The WEBT BL Lacertae campaign 2000. Astronomy and Astrophysics, 390(2), 407-421. https://doi.org/10.1051/0004-6361:20020662, https://doi.org/10.1051/0004-6361:20020662

Vancouver

Villata M, Raiteri CM, Kurtanidze OM, Nikolashvili MG, Ibrahimov MA, Papadakis IE и пр. The WEBT BL Lacertae campaign 2000. Astronomy and Astrophysics. 2002 Авг.;390(2):407-421. https://doi.org/10.1051/0004-6361:20020662, https://doi.org/10.1051/0004-6361:20020662

Author

Villata, M. ; Raiteri, C. M. ; Kurtanidze, O. M. ; Nikolashvili, M. G. ; Ibrahimov, M. A. ; Papadakis, I. E. ; Tsinganos, K. ; Sadakane, K. ; Okada, N. ; Takalo, L. O. ; Sillanpää, A. ; Tosti, G. ; Ciprini, S. ; Frasca, A. ; Marilli, E. ; Robb, R. M. ; Noble, J. C. ; Jorstad, S. G. ; Hagen-Thorn, V. A. ; Larionov, V. M. ; Nesci, R. ; Maesano, M. ; Schwartz, R. D. ; Basler, J. ; Gorham, P. W. ; Iwamatsu, H. ; Kato, T. ; Pullen, C. ; Benítez, E. ; De Diego, J. A. ; Moilanen, M. ; Oksanen, A. ; Rodriguez, D. ; Sadun, A. C. ; Kelly, M. ; Carini, M. T. ; Miller, H. R. ; Catalano, S. ; Dultzin-Hacyan, D. ; Fan, J. H. ; Ishioka, R. ; Karttunen, H. ; Keinänen, P. ; Kudryavtseva, N. A. ; Lainela, M. ; Lanteri, L. ; Larionov, E. G. ; Matsumoto, K. ; Mattox, J. R. ; Montagni, F. ; Nucciarelli, G. ; Ostorero, L. ; Papamastorakis, J. ; Pasanen, M. ; Sobrito, G. ; Uemura, M. / The WEBT BL Lacertae campaign 2000. в: Astronomy and Astrophysics. 2002 ; Том 390, № 2. стр. 407-421.

BibTeX

@article{6d60aafba39844c7bb6d8568b5b0eb84,
title = "The WEBT BL Lacertae campaign 2000",
abstract = "We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were performed in that period, which was the extension of the Whole Earth Blazar Telescope (WEBT) campaign originally planned for July-August 2000. The exceptional sampling reached allows one to follow the flux behaviour in fine detail. Two different phases can be distinguished in the light curves: a first, relatively low-brightness phase is followed by an outburst phase, after a more than 1 mag brightening in a few weeks. Both the time duration (about 100 d) and the variation amplitude (roughly 0.9 mag) are similar in the two phases. Rapid flux oscillations are present all the time, involving variations up to a few tenths of mag on hour time scales, and witnessing an intense intraday activity of this source. In particular, a half-mag brightness decrease in about 7 h was detected on August 8-9, 2000, immediately followed by a ∼0.4 mag brightening in 1.7 h. Colour indexes have been derived by coupling the highest precision B and R data taken by the same instrument within 20 min and after subtracting the host galaxy contribution from the fluxes. The 620 indexes obtained show that the optical spectrum is weakly sensitive to the long-term trend, while it strictly follows the short-term flux behaviour, becoming bluer when the brightness increases. Thus, spectral changes are not related to the host galaxy contribution, but they are an intrinsic feature of fast flares. We suggest that the achromatic mechanism causing the long-term flux base-level modulation can be envisaged in a variation of the relativistic Doppler beaming factor, and that this variation is likely due to a change of the viewing angle. Discrete correlation function (DCF) analysis reveals the existence of a characteristic time scale of variability of ∼7 h in the light curve of the core WEBT campaign, while no measurable time delay between variations in the B and R bands is found.",
keywords = "Galaxies: active, Galaxies: BL Lacertae objects: general, Galaxies: BL Lacertae objects: individual: BL Lacertae, Galaxies: jets, 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 K. Tsinganos and K. Sadakane and N. Okada and Takalo, {L. O.} and A. Sillanp{\"a}{\"a} and G. Tosti and S. Ciprini and A. Frasca and E. Marilli and Robb, {R. M.} and Noble, {J. C.} and Jorstad, {S. G.} and Hagen-Thorn, {V. A.} and Larionov, {V. M.} and R. Nesci and M. Maesano and Schwartz, {R. D.} and J. Basler and Gorham, {P. W.} and H. Iwamatsu and T. Kato and C. Pullen and E. Ben{\'i}tez and {De Diego}, {J. A.} and M. Moilanen and A. Oksanen and D. Rodriguez and Sadun, {A. C.} and M. Kelly and Carini, {M. T.} and Miller, {H. R.} and S. Catalano and D. Dultzin-Hacyan and Fan, {J. H.} and R. Ishioka and H. Karttunen and P. Kein{\"a}nen and Kudryavtseva, {N. A.} and M. Lainela and L. Lanteri and Larionov, {E. G.} and K. Matsumoto and Mattox, {J. R.} and F. Montagni and G. Nucciarelli and L. Ostorero and J. Papamastorakis and M. Pasanen and G. Sobrito and M. Uemura",
year = "2002",
month = aug,
doi = "10.1051/0004-6361:20020662",
language = "English",
volume = "390",
pages = "407--421",
journal = "ASTRONOMY & ASTROPHYSICS",
issn = "0004-6361",
publisher = "EDP Sciences",
number = "2",

}

RIS

TY - JOUR

T1 - The WEBT BL Lacertae campaign 2000

AU - Villata, M.

AU - Raiteri, C. M.

AU - Kurtanidze, O. M.

AU - Nikolashvili, M. G.

AU - Ibrahimov, M. A.

AU - Papadakis, I. E.

AU - Tsinganos, K.

AU - Sadakane, K.

AU - Okada, N.

AU - Takalo, L. O.

AU - Sillanpää, A.

AU - Tosti, G.

AU - Ciprini, S.

AU - Frasca, A.

AU - Marilli, E.

AU - Robb, R. M.

AU - Noble, J. C.

AU - Jorstad, S. G.

AU - Hagen-Thorn, V. A.

AU - Larionov, V. M.

AU - Nesci, R.

AU - Maesano, M.

AU - Schwartz, R. D.

AU - Basler, J.

AU - Gorham, P. W.

AU - Iwamatsu, H.

AU - Kato, T.

AU - Pullen, C.

AU - Benítez, E.

AU - De Diego, J. A.

AU - Moilanen, M.

AU - Oksanen, A.

AU - Rodriguez, D.

AU - Sadun, A. C.

AU - Kelly, M.

AU - Carini, M. T.

AU - Miller, H. R.

AU - Catalano, S.

AU - Dultzin-Hacyan, D.

AU - Fan, J. H.

AU - Ishioka, R.

AU - Karttunen, H.

AU - Keinänen, P.

AU - Kudryavtseva, N. A.

AU - Lainela, M.

AU - Lanteri, L.

AU - Larionov, E. G.

AU - Matsumoto, K.

AU - Mattox, J. R.

AU - Montagni, F.

AU - Nucciarelli, G.

AU - Ostorero, L.

AU - Papamastorakis, J.

AU - Pasanen, M.

AU - Sobrito, G.

AU - Uemura, M.

PY - 2002/8

Y1 - 2002/8

N2 - We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were performed in that period, which was the extension of the Whole Earth Blazar Telescope (WEBT) campaign originally planned for July-August 2000. The exceptional sampling reached allows one to follow the flux behaviour in fine detail. Two different phases can be distinguished in the light curves: a first, relatively low-brightness phase is followed by an outburst phase, after a more than 1 mag brightening in a few weeks. Both the time duration (about 100 d) and the variation amplitude (roughly 0.9 mag) are similar in the two phases. Rapid flux oscillations are present all the time, involving variations up to a few tenths of mag on hour time scales, and witnessing an intense intraday activity of this source. In particular, a half-mag brightness decrease in about 7 h was detected on August 8-9, 2000, immediately followed by a ∼0.4 mag brightening in 1.7 h. Colour indexes have been derived by coupling the highest precision B and R data taken by the same instrument within 20 min and after subtracting the host galaxy contribution from the fluxes. The 620 indexes obtained show that the optical spectrum is weakly sensitive to the long-term trend, while it strictly follows the short-term flux behaviour, becoming bluer when the brightness increases. Thus, spectral changes are not related to the host galaxy contribution, but they are an intrinsic feature of fast flares. We suggest that the achromatic mechanism causing the long-term flux base-level modulation can be envisaged in a variation of the relativistic Doppler beaming factor, and that this variation is likely due to a change of the viewing angle. Discrete correlation function (DCF) analysis reveals the existence of a characteristic time scale of variability of ∼7 h in the light curve of the core WEBT campaign, while no measurable time delay between variations in the B and R bands is found.

AB - We present UBVRI light curves of BL Lacertae from May 2000 to January 2001, obtained by 24 telescopes in 11 countries. More than 15 000 observations were performed in that period, which was the extension of the Whole Earth Blazar Telescope (WEBT) campaign originally planned for July-August 2000. The exceptional sampling reached allows one to follow the flux behaviour in fine detail. Two different phases can be distinguished in the light curves: a first, relatively low-brightness phase is followed by an outburst phase, after a more than 1 mag brightening in a few weeks. Both the time duration (about 100 d) and the variation amplitude (roughly 0.9 mag) are similar in the two phases. Rapid flux oscillations are present all the time, involving variations up to a few tenths of mag on hour time scales, and witnessing an intense intraday activity of this source. In particular, a half-mag brightness decrease in about 7 h was detected on August 8-9, 2000, immediately followed by a ∼0.4 mag brightening in 1.7 h. Colour indexes have been derived by coupling the highest precision B and R data taken by the same instrument within 20 min and after subtracting the host galaxy contribution from the fluxes. The 620 indexes obtained show that the optical spectrum is weakly sensitive to the long-term trend, while it strictly follows the short-term flux behaviour, becoming bluer when the brightness increases. Thus, spectral changes are not related to the host galaxy contribution, but they are an intrinsic feature of fast flares. We suggest that the achromatic mechanism causing the long-term flux base-level modulation can be envisaged in a variation of the relativistic Doppler beaming factor, and that this variation is likely due to a change of the viewing angle. Discrete correlation function (DCF) analysis reveals the existence of a characteristic time scale of variability of ∼7 h in the light curve of the core WEBT campaign, while no measurable time delay between variations in the B and R bands is found.

KW - Galaxies: active

KW - Galaxies: BL Lacertae objects: general

KW - Galaxies: BL Lacertae objects: individual: BL Lacertae

KW - Galaxies: jets

KW - Quasars: general

UR - http://www.scopus.com/inward/record.url?scp=17344391683&partnerID=8YFLogxK

U2 - 10.1051/0004-6361:20020662

DO - 10.1051/0004-6361:20020662

M3 - Article

VL - 390

SP - 407

EP - 421

JO - ASTRONOMY & ASTROPHYSICS

JF - ASTRONOMY & ASTROPHYSICS

SN - 0004-6361

IS - 2

ER -

ID: 17061903