Constraints on the location of the gamma-ray emission region for the gamma-ray-loud radio source GB 1310+487

Abstract

We employ a single-zone leptonic jet model, with synchrotron, synchrotron self-Compton (SSC) and external Compton (EC) process, to reproduce the quasi-simultaneous multi-wavelength spectral energy distributions in active and quiescent states of the narrow-line gamma-ray-loud radio source GB 1310+487. In the case of the EC process, the external seed photons from both broad line region (BLR) and dust torus are considered by assuming that the gamma-ray emission region is located at the outside boundary of the BLR and inside the dust torus. Comparing the energy density of external photon fields $U_{\mathrm{BLR}}$ obtained by model fitting with that constrained from the BLR observations. We find that the location of the gamma-ray emitting region of GB 1310+487 can be tightly constrained at the outer edge of the BLR (the dissipation distance of the $\gamma$-ray emission region from central black hole $r_{\mathrm{diss}}\sim \mathrm{a}\mathrm{few}\mathrm{times}\mathrm{of}{R}_{\mathrm{BLR}}$). The ratio of magnetic energy and emitting-electron energy in the radiation blob (${\epsilon }_B=L_B/L_{\mathrm{e}}$) is gradually increased from Flare 1, Flare 2 to Post-Flare, where the magnetic energy increase and matter energy decrease. These results suggest that the conversion of the magnetic field and the matter (radiation electrons) energy and the location of the $\gamma$-ray emission region (or ambient photon field) may play an important role in different radiation states of GB 1310+487.

Accepted for publication in ApJ. 9 pages, 1 figure, 1 table. arXiv admin note: text overlap with arXiv:1606.00438

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