Περίληψη:
Decade-long monitoring of blazars at optical and infrared (OIR)
wavelengths with the Small and Moderate Aperture Research Telescope
System (SMARTS) in Chile and in gamma-rays with the Fermi -Large Area
Telescope (LAT) has enabled the systematic study of their
multiwavelength long-term variability. In this work, we investigate,
from a theoretical perspective, the long-term variability properties of
blazar emission by introducing an observationally motivated
time-dependence to four main parameters of the one-zone leptonic model:
injection luminosity of relativistic electrons, strength of magnetic
field, Doppler factor, and external photon field luminosity. For the
first time, we use both the probability density function and the power
spectral density of the 10-yr-long Fermi-LAT light curves to create
variation patterns for the model parameters. Using as test beds two
bright blazars from the SMARTS sample (PKS 2155-304 and 3C 273), we
compute 10-yr-long OIR, X-ray, and. -ray model light curves for
different varying parameters. We compare the findings of our theoretical
investigation with multiwavelength observations using various measures
of variability. While no single-varying parameter simulation can explain
all multiwavelength variability properties, changes in the electron
luminosity and external radiation field in PKS 2155-304 and 3C 273,
respectively, can account for most of them. Our results motivate future
time-dependent studies with coupling between two or more physical
parameters to describe the multiwavelength long-term blazar variability.
Συγγραφείς:
Polkas, M.
Petropoulou, M.
Vasilopoulos, G.
Mastichiadis, A.
and Urry, C. M.
Coppi, P.
Bailyn, C.
