Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0715w&link_type=abstract
American Astronomical Society, HEAD meeting #12, #7.15
Astronomy and Astrophysics
Astronomy
Scientific paper
Extended, densely sampled, high S/N photometry of 100 Blazars emitting in the gamma-ray band has been used to study variability characteristics in different frequency bands. High duty cycles and power-law power spectra are found for most of the sources. The high duty cycles imply that at any epoch several flares contribute to the integrated light curve, limiting statistical investigations due to superpositions of different events. We discuss methods to study the temporal symmetry and present Monte Carlo simulations to investigate the effects of sampling patterns. The effect of blending by events of very different decay times is examined in detail. An increase in sampling frequency due to triggers set by enhanced activity affects some methods used in previous investigations. The majority of sources shows light curves fully described by noise processes and are invariant under time reversal. The paper describes the results in different temporal windows and frequency domains and discusses the accuracy and limitations of limits on temporal symmetry. We examine the physical implications of the results and discuss geometric models of variability.
Hauser Marcus
Kurtanidze Omar
Wagner Stefan J.
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