The optical-gamma correlation in BL Lacertae

Claudia M. Raiteri, Massimo Villata, Filippo D'Ammando, Valeri M. Larionov, Mark A. Gurwell, Davron O. Mirzaqulov, Paul S. Smith, Maria Isabel Carnerero

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number04014
JournalEPJ Web of Conferences
Volume61
DOIs
StatePublished - 2013
EventInternational Symposium on the Innermost Regions of Relativistic Jets and Their Magnetic Fields - Granada, Spain
Duration: Jun 10 2013Jun 14 2013

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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