The γ $\gamma$ -ray spectral changes in Fermi blazars

Yang, Jiang-He; Fan, J. H.; Nie, Jianjun; Ru-shu, Yang; Man-xian, Tuo; Zhang, Yuelian

doi:10.1007/s10509-016-3002-y

Cited by 8 publications

(2 citation statements)

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“…Through the log-parabolic model fitting, 12 fitting parameters can be obtained as β syn , β ic , log ν syn peak , log ν ic peak , log L syn peak , log L ic peak , and the spectral index α ν of each band: the radio (1.4 GHz), infrared (2.2 µm), optical (J band, 1250 nm), ultraviolet (250 nm), soft X-ray (1 keV) and γ-ray (20 GeV) bands (Fossati et al 1998;Nie et al 2014;Yang et al 2017). We can also calculate the physical parameters indirectly, including D, R, B and γ p .…”

Section: The Intrinsic Physical Parametersmentioning

confidence: 99%

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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope

Ajello

Angioni

Axelsson

et al. 2020

ApJ

302

231

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In this paper, we have selected a sample of 64 teraelectronvolt blazars, with redshift, from those classified in the fourth Fermi Large Area Telescope source catalog a) . We have obtained the values of the relevant physical parameters by performing a log-parabolic fitting of the average-state multiwavelength spectral energy distributions. We estimate the range of the radiation zone parameters, such as the Doppler factor (D), the magnetic field strength (B), the radiative zone radius (R) and the peak Lorentz factor (γ p ) of nonthermal electrons. Here, we show that (1) there is a strong linear positive correlation between the intrinsic synchrotron peak frequency and the intrinsic inverse Compton scattering (ICs) peak frequency among different types of blazars; (2) if radio bands are excluded, the spectral index of each band is negatively correlated with the intrinsic peak frequency; (3) there is a strong linear negative correlation between the curvature at the peak and the intrinsic peak frequency of the synchrotron bump, and a weak positive correlation between the curvature at the peak and the intrinsic peak frequency of the ICs bump; (4) there is a strong linear positive correlation between the intrinsic ICs peak luminosity and intrinsic γ-ray luminosity and between the intrinsic ICs peak frequency and peak Lorentz factor;(5) there is a strong negative linear correlation between log B and log γ p ; and (6) there is no correlation between log R and log γ p .

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Section: The Intrinsic Physical Parametersmentioning

confidence: 99%

“…We can also calculate the physical parameters indirectly, including D, R, B and γ p . In addition, we can calculate the γ-ray luminosity at E = 20 GeV by the following formula (Fan et al 2012(Fan et al , 2015Nie et al 2014;Yang et al 2017):…”

Section: The Intrinsic Physical Parametersmentioning

confidence: 99%