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The sequence of Compton dominance in blazars based on data from WISE and Fermi-LAT

Author:
Nalewajko, Krzysztof  Gupta, Maitrayee  


Journal:
ASTRONOMY & ASTROPHYSICS


Issue Date:
2017


Abstract(summary):

The two-component broad-band spectral energy distributions of blazars were suggested to form a sequence in which (1) the peak frequency of the low-energy (synchrotron) component nu(syn) is anticorrelated with the bolometric synchrotron luminosity L-syn and (2) the luminosity ratio of the high-energy (inverse Compton) to synchrotron components q =3D L-IC/L-syn (Compton dominance) increases with Lsyn from the BL Lac objects (BL Lacs) to the flat spectrum radio quasars (FSRQs). The Compton dominance parameter is an important probe of plasma magnetisation in the blazar zones within relativistic jets. We investigate a sample of blazars detected by WISE in the mid-infrared (MIR) band and by Fermi-LAT in the GeV gamma-ray band, with the focus on the distribution of luminosities and photon indices. Our findings are the following: (1) the MIR photon index Gamma(W12) is a useful probe of the blazar sequence, with the exception of low-luminosity BL Lacs that are most likely contaminated by their host galaxies (L-W1 similar to 1044 erg s(-1) and Gamma(W12) < 1); (2) Gamma(W12) is correlated with the gamma-ray photon index Gamma(1-100) GeV, with the MIR luminosity L-W1, and with the Fermi/WISE Compton dominance q(FW) =3D L-1 GeV =3D L-W1; (3) a clean separation between FSRQs and BL Lacs can be seen in the parameter space of Gamma(W12) and q(FW); and (4) the observed distribution of MIR luminosity L-W1 versus Compton dominance qFW for the entire sample of blazars can be modelled as a sequence of lepto-magnetic jet powers in the range log(10) P-eB is an element of [42 : 45] with the preference for sub-equipartition magnetic fields P-B/P-e is an element of [0 .05 : 1], assuming fixed bulk Lorentz factor Gamma(j)=3D 15, fixed jet opening angle Gamma(j)Theta(j) =3D 0 : 3, fixed radiative e ffi ciency of jet electrons is an element of(em) =3D 50%, and that external radiation luminosity scales like L-ext alpha P-eB(1.6) (parameter degeneracies are discussed).


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