Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands

R. C. Hartman; M. Villata; T. J. Balonek; D. L. Bertsch; H. Bock; M. Böttcher; M. T. Carini; W. Collmar; G. De Francesco; E. C. Ferrara; J. Heidt; G. Kanbach; S. Katajainen; M. Koskimies; O. M. Kurtanidze; L. Lanteri; A. Lawson; Y. C. Lin; A. P. Marscher; J. P. McFarland; I. M. McHardy; H. R. Miller; M. Nikolashvili; K. Nilsson; J. C. Noble; G. Nucciarelli; L. Ostorero; T. Pursimo; C. M. Raiteri; R. Rekola; T. Savolainen; A. Sillanpää; A. Smale; G. Sobrito; L. O. Takalo; D. J. Thompson; G. Tosti; S. J. Wagner; J. W. Wilson

doi:10.1086/322462

Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands

R. C. Hartman
, M. Villata
, T. J. Balonek
, D. L. Bertsch
, H. Bock
, M. Böttcher
, M. T. Carini
, W. Collmar
, G. De Francesco
, E. C. Ferrara
, J. Heidt
, G. Kanbach
, S. Katajainen
, M. Koskimies
, O. M. Kurtanidze
, L. Lanteri
, A. Lawson
, Y. C. Lin
, A. P. Marscher
, J. P. McFarland

I. M. McHardy, H. R. Miller, M. Nikolashvili, K. Nilsson, J. C. Noble, G. Nucciarelli, L. Ostorero, T. Pursimo, C. M. Raiteri, R. Rekola, T. Savolainen, A. Sillanpää, A. Smale, G. Sobrito, L. O. Takalo, D. J. Thompson, G. Tosti, S. J. Wagner, J. W. Wilson

Not published at Aalto University

Tuorla Observatory

Research output: Contribution to journal › Article › Scientific › peer-review

Abstract

Light curves of 3C 279 are presented in optical (R band), X-rays (RXTE/PCA), and γ rays (CGRO/EGRET) for 1999 January-February and 2000 January-March. During both of those epochs the γ-ray levels were high and all three observed bands demonstrated substantial variation, on timescales as short as 1 day. Correlation analyses provided no consistent pattern, although a rather significant optical/γ-ray correlation was seen in 1999, with a γ-ray lag of ~2.5 days, and there are other suggestions of correlations in the light curves. For comparison, correlation analysis is also presented for the γ-ray and X-ray light curves during the large γ ray flare in 1996 February and the two γ-bright weeks leading up to it; the correlation at that time was strong, with a γ-ray/X-ray offset of no more than 1 day.

Original language	English
Pages (from-to)	583-589
Journal	The Astrophysical Journal
Volume	558
Issue number	2
DOIs	https://doi.org/10.1086/322462
Publication status	Published - 2001
MoE publication type	A1 Journal article-refereed

Keywords

Gamma Rays: Observations
Galaxies: Quasars: Individual: Alphanumeric: 3C 279

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10.1086/322462

http://adsabs.harvard.edu/abs/2001ApJ...558..583H

Cite this

Hartman, R. C., Villata, M., Balonek, T. J., Bertsch, D. L., Bock, H., Böttcher, M., Carini, M. T., Collmar, W., De Francesco, G., Ferrara, E. C., Heidt, J., Kanbach, G., Katajainen, S., Koskimies, M., Kurtanidze, O. M., Lanteri, L., Lawson, A., Lin, Y. C., Marscher, A. P., ... Wilson, J. W. (2001). Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands. The Astrophysical Journal, 558(2), 583-589. https://doi.org/10.1086/322462

@article{de9189c85b02424cbb8617a2e8dc91be,

title = "Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands",

abstract = "Light curves of 3C 279 are presented in optical (R band), X-rays (RXTE/PCA), and γ rays (CGRO/EGRET) for 1999 January-February and 2000 January-March. During both of those epochs the γ-ray levels were high and all three observed bands demonstrated substantial variation, on timescales as short as 1 day. Correlation analyses provided no consistent pattern, although a rather significant optical/γ-ray correlation was seen in 1999, with a γ-ray lag of \textasciitilde{}2.5 days, and there are other suggestions of correlations in the light curves. For comparison, correlation analysis is also presented for the γ-ray and X-ray light curves during the large γ ray flare in 1996 February and the two γ-bright weeks leading up to it; the correlation at that time was strong, with a γ-ray/X-ray offset of no more than 1 day.",

keywords = "Gamma Rays: Observations, Galaxies: Quasars: Individual: Alphanumeric: 3C 279",

author = "Hartman, \{R. C.\} and M. Villata and Balonek, \{T. J.\} and Bertsch, \{D. L.\} and H. Bock and M. B{\"o}ttcher and Carini, \{M. T.\} and W. Collmar and \{De Francesco\}, G. and Ferrara, \{E. C.\} and J. Heidt and G. Kanbach and S. Katajainen and M. Koskimies and Kurtanidze, \{O. M.\} and L. Lanteri and A. Lawson and Lin, \{Y. C.\} and Marscher, \{A. P.\} and McFarland, \{J. P.\} and McHardy, \{I. M.\} and Miller, \{H. R.\} and M. Nikolashvili and K. Nilsson and Noble, \{J. C.\} and G. Nucciarelli and L. Ostorero and T. Pursimo and Raiteri, \{C. M.\} and R. Rekola and T. Savolainen and A. Sillanp{\"a}{\"a} and A. Smale and G. Sobrito and Takalo, \{L. O.\} and Thompson, \{D. J.\} and G. Tosti and Wagner, \{S. J.\} and Wilson, \{J. W.\}",

year = "2001",

doi = "10.1086/322462",

language = "English",

volume = "558",

pages = "583--589",

journal = "The Astrophysical Journal",

issn = "0004-637X",

publisher = "Institute of Physics Publishing",

number = "2",

}

Hartman, RC, Villata, M, Balonek, TJ, Bertsch, DL, Bock, H, Böttcher, M, Carini, MT, Collmar, W, De Francesco, G, Ferrara, EC, Heidt, J, Kanbach, G, Katajainen, S, Koskimies, M, Kurtanidze, OM, Lanteri, L, Lawson, A, Lin, YC, Marscher, AP, McFarland, JP, McHardy, IM, Miller, HR, Nikolashvili, M, Nilsson, K, Noble, JC, Nucciarelli, G, Ostorero, L, Pursimo, T, Raiteri, CM, Rekola, R, Savolainen, T, Sillanpää, A, Smale, A, Sobrito, G, Takalo, LO, Thompson, DJ, Tosti, G, Wagner, SJ & Wilson, JW 2001, 'Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands', The Astrophysical Journal, vol. 558, no. 2, pp. 583-589. https://doi.org/10.1086/322462

TY - JOUR

T1 - Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands

AU - Hartman, R. C.

AU - Villata, M.

AU - Balonek, T. J.

AU - Bertsch, D. L.

AU - Bock, H.

AU - Böttcher, M.

AU - Carini, M. T.

AU - Collmar, W.

AU - De Francesco, G.

AU - Ferrara, E. C.

AU - Heidt, J.

AU - Kanbach, G.

AU - Katajainen, S.

AU - Koskimies, M.

AU - Kurtanidze, O. M.

AU - Lanteri, L.

AU - Lawson, A.

AU - Lin, Y. C.

AU - Marscher, A. P.

AU - McFarland, J. P.

AU - McHardy, I. M.

AU - Miller, H. R.

AU - Nikolashvili, M.

AU - Nilsson, K.

AU - Noble, J. C.

AU - Nucciarelli, G.

AU - Ostorero, L.

AU - Pursimo, T.

AU - Raiteri, C. M.

AU - Rekola, R.

AU - Savolainen, T.

AU - Sillanpää, A.

AU - Smale, A.

AU - Sobrito, G.

AU - Takalo, L. O.

AU - Thompson, D. J.

AU - Tosti, G.

AU - Wagner, S. J.

AU - Wilson, J. W.

PY - 2001

Y1 - 2001

N2 - Light curves of 3C 279 are presented in optical (R band), X-rays (RXTE/PCA), and γ rays (CGRO/EGRET) for 1999 January-February and 2000 January-March. During both of those epochs the γ-ray levels were high and all three observed bands demonstrated substantial variation, on timescales as short as 1 day. Correlation analyses provided no consistent pattern, although a rather significant optical/γ-ray correlation was seen in 1999, with a γ-ray lag of ~2.5 days, and there are other suggestions of correlations in the light curves. For comparison, correlation analysis is also presented for the γ-ray and X-ray light curves during the large γ ray flare in 1996 February and the two γ-bright weeks leading up to it; the correlation at that time was strong, with a γ-ray/X-ray offset of no more than 1 day.

AB - Light curves of 3C 279 are presented in optical (R band), X-rays (RXTE/PCA), and γ rays (CGRO/EGRET) for 1999 January-February and 2000 January-March. During both of those epochs the γ-ray levels were high and all three observed bands demonstrated substantial variation, on timescales as short as 1 day. Correlation analyses provided no consistent pattern, although a rather significant optical/γ-ray correlation was seen in 1999, with a γ-ray lag of ~2.5 days, and there are other suggestions of correlations in the light curves. For comparison, correlation analysis is also presented for the γ-ray and X-ray light curves during the large γ ray flare in 1996 February and the two γ-bright weeks leading up to it; the correlation at that time was strong, with a γ-ray/X-ray offset of no more than 1 day.

KW - Gamma Rays: Observations

KW - Galaxies: Quasars: Individual: Alphanumeric: 3C 279

U2 - 10.1086/322462

DO - 10.1086/322462

M3 - Article

SN - 0004-637X

VL - 558

SP - 583

EP - 589

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

ER -

Day-Scale Variability of 3C 279 and Searches for Correlations in Gamma-Ray, X-Ray, and Optical Bands

Abstract

Keywords

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