The optical-gamma correlation in BL Lacertae

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 gamma -ray) come from observations of the Swift, RXTE, and Fermi satellit...

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Bibliographic Details
Published in:EPJ Web of conferences 2013-01, Vol.61, p.4014-np
Main Authors: Raiteri, Claudia M., Villata, Massimo, D’Ammando, Filippo, Larionov, Valeri M., Gurwell, Mark A., Mirzaqulov, Davron O., Smith, Paul S., Carnerero, Maria Isabel
Format: Article
Language:English
Subjects:
Bands
Correlation
Flares
Flux
Fluxes
Sampling
Wavelengths
X-rays
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Summary: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 gamma -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 gamma 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 gamma -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 +or-1 day. Indeed, the data reveal a complex relationship between the gamma and optical fluxes, which cannot be unveiled because of the small gaps in the sampling of this extremely variable source.
ISSN:2100-014X
2100-014X
DOI:10.1051/epjconf/20136104014