Abstract
Abstract We have studied the location of emission regions through modeling the quasi-simultaneous multifrequency spectral energy distributions of 21 Fermi flat-spectrum radio quasars (FSRQs) in the frame of a multicomponent one-zone leptonic model. In our calculations, we took the detailed broad line region (BLR) structure into account, and discussed the effect of the uncertainty of the BLR structure on constraining the location of the emission regions for each FSRQ; besides, we also included both the internal and the external absorptions. Our results indicate that: (1) the contribution of the external Compton-BLR component to the $ \gamma$-ray emission is important, and the energy density of external target-photon fields depends on the location of the emission region, which can be derived by reproducing the observed $ \gamma$-ray emission; (2) the emission regions of FSRQs with relatively low accretion-disk luminosity lie in the region of (7.9 $ \times$ 10$ ^{16}$ –1.3 $ \times$ 10$ ^{18})$ cm (300–4300 Schwarzschild radii) from central black hole, and for FSRQs with high accretion-disk luminosity, the emission regions are located in a larger region of (2.6 $ \times$ 10$ ^{17}$ –4.2 $ \times$ 10$ ^{18}$ ) cm (300–5600 Schwarzschild radii).
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
