Astrophys. J., 774, L5 (2013/September-1)
Radiation mechanism and jet composition of gamma-ray bursts and GeV-TeV-selected radio-loud active galactic nuclei.
ZHANG J., LIANG E.-W., SUN X.-N., ZHANG B., LU Y. and ZHANG S.-N.
Abstract (from CDS):
Gamma-ray bursts (GRBs) and GeV-TeV-selected radio-loud active galactic nuclei (AGNs) are compared based on our systematic modeling of the observed spectral energy distributions of a sample of AGNs with a single-zone leptonic model. We show that the correlation between the jet power (Pjet) and the prompt gamma-ray luminosity (Ljet) of GRBs is consistent, within the uncertainties, with the correlation between jet power and the synchrotron peak luminosity (L_s, jet_) of flat spectrum radio quasars (FSRQs). Their radiation efficiencies (ε) are also comparable (>10% for most sources), which increase with the bolometric jet luminosity (L_bol, jet_) for FSRQs and with the Ljet for GRBs with similar power-law indices. BL Lac objects (BL Lacs) do not follow the Pjet-L_s, jet_ relation of FSRQs. They have lower ε and L_bol, jet_ values than FSRQs, and a tentative L_bol, jet_-ε relation is also found, with a power-law index different from that of the FSRQs. The magnetization parameters (σ) of FSRQs are on average larger than that of BL Lacs. They are anti-correlated with ε for the FSRQs, but positively correlated with ε for the BL Lacs. GeV narrow-line Seyfert 1 galaxies potentially share similar properties with FSRQs. Based on the analogy between GRBs and FSRQs, we suggest that the prompt gamma-ray emission of GRBs is likely produced by the synchrotron process in a magnetized jet with high radiation efficiency, similar to FSRQs. The jets of BL Lacs, on the other hand, are less efficient and are likely more matter-dominated.
BL Lacertae objects: general - galaxies: jets - gamma-ray burst: general - methods: statistical - quasars: general
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