Correlations among the jet, Accretion disk, and broad-line region of flat spectrum radio quasars
- Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
- Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
On the basis of the spectral energy distribution fits and emission line fluxes of 18 GeV flat spectrum radio quasars (FSRQs), we calculate their jet power (P{sub jet}), disk luminosity (L{sub disk}), and broad-line region luminosity (L{sub BLR}). No correlation between P{sub jet} with either L{sub disk} or L{sub BLR} is found, but L{sub BLR} is strongly correlated with L{sub disk}. On average, the broad-line region (BLR) covering factors of GeV-FSRQs in our sample are smaller than those of large samples of quasars. P{sub jet} of some GeV-FSRQs are higher than their L{sub disk}, but all of them are lower than the accretion power of black holes (BHs), which is estimated by M-dot c{sup 2}=L{sub disk}/0.1, indicating that the total accretion power of BHs is sufficient to drive the jets in these sources; however, lack of correlation between L{sub disk} and P{sub jet} of the GeV-FSRQs may suggest that their jets are launched by the Blandford–Znajek process via extracting the rotational energy of BHs. Using the L{sub BLR}–L{sub disk} relation of the GeV-FSRQs, we estimate L{sub disk} of a BL Lac sample with their L{sub BLR}. A comparison of L{sub BLR} and the Eddington ratio (L{sub disk}/L{sub Edd}) among BL Lacs, very radio-loud NLS1 galaxies, and FSRQs is also presented. It is found that along with the BL Lac–NLS1–FSRQ sequence L{sub BLR} and L{sub disk}/L{sub Edd} increase, which may correspond to the change of the accretion disk structure and the transformation of the dominant mechanism for jet launching. This is also consistent with the division of blazar parent populations, i.e., low/high-excitation radio galaxies.
- OSTI ID:
- 22882968
- Journal Information:
- Astrophysical Journal, Vol. 807, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Since 2009, the country of publication for this journal is the UK.; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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