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2019ApJ...885...12R - Astrophys. J., 885, 12-12 (2019/November-1)

Characteristic variability timescales in the gamma-ray power spectra of blazars.


Abstract (from CDS):

Characteristic variability timescales in blazar γ-ray light curves can provide insights into the physical processes responsible for γ-ray variability. The power spectral density (PSD) is capable of revealing such timescales, which may appear as breaks or periodicities. Continuous-time autoregressive moving-average (CARMA) models can be used to accurately estimate a light curve's PSD. Through a light-curve simulation study, we develop a methodology to identify PSD breaks using CARMA models. Using this methodology, we study the γ-ray light curves of 13 bright blazars observed with the Fermi Large Area Telescope in the 0.1-300 GeV band over 9.5 yr. We present the blazar γ-ray PSDs, which provide evidence for low-frequency breaks on timescales ∼1 yr in four sources, and an additional high-frequency break on a timescale ∼9 days in one source.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): black hole physics - BL Lacertae objects: general - galaxies: active - galaxies: jets - gamma rays: galaxies

Simbad objects: 14

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