TY - JOUR
T1 - The optical-gamma correlation in BL Lacertae
AU - Raiteri, Claudia M.
AU - Villata, Massimo
AU - D'Ammando, Filippo
AU - Larionov, Valeri M.
AU - Gurwell, Mark A.
AU - Mirzaqulov, Davron O.
AU - Smith, Paul S.
AU - Carnerero, Maria Isabel
PY - 2013
Y1 - 2013
N2 - We present multifrequency light curves of BL Lacertae from February 2008 to October 2012. Lowenergy data (optical and millimetre) were acquired in the framework of a GASP-WEBT project. High-energy data (ultraviolet, X-ray, and γ-ray) come from observations of the Swift, RXTE, and Fermi satellites. After a period of moderate activity, in May 2011 the source suddenly started to flare at γ and optical-UV frequencies. Activity at millimetre wavelengths and X rays began 3-4 months later. This behaviour offered a good opportunity to study the correlation among flux variability in different bands, in particular between the best-sampled optical and γ-ray light curves. However, even in this fortuitous case, we can only define a general correlation with likely no time lag, but with a lag uncertainty of ±1 day. Indeed, the data reveal a complex relationship between the γ and optical fluxes, which cannot be unveiled because of the small gaps in the sampling of this extremely variable source.
AB - We present multifrequency light curves of BL Lacertae from February 2008 to October 2012. Lowenergy data (optical and millimetre) were acquired in the framework of a GASP-WEBT project. High-energy data (ultraviolet, X-ray, and γ-ray) come from observations of the Swift, RXTE, and Fermi satellites. After a period of moderate activity, in May 2011 the source suddenly started to flare at γ and optical-UV frequencies. Activity at millimetre wavelengths and X rays began 3-4 months later. This behaviour offered a good opportunity to study the correlation among flux variability in different bands, in particular between the best-sampled optical and γ-ray light curves. However, even in this fortuitous case, we can only define a general correlation with likely no time lag, but with a lag uncertainty of ±1 day. Indeed, the data reveal a complex relationship between the γ and optical fluxes, which cannot be unveiled because of the small gaps in the sampling of this extremely variable source.
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U2 - 10.1051/epjconf/20136104014
DO - 10.1051/epjconf/20136104014
M3 - Conference article
AN - SCOPUS:84893315425
SN - 2101-6275
VL - 61
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 04014
T2 - International Symposium on the Innermost Regions of Relativistic Jets and Their Magnetic Fields
Y2 - 10 June 2013 through 14 June 2013
ER -