Abstract
We collect a sample of 78 Fermi detected blazars with broad line region (BLR) data and the quasi-simultaneous multi-wave band data. By analyzing the sample, we find: (1) For whole blazar sample, there exist significant correlations between radio, \(\gamma\)-ray luminosity and BLR luminosity. The slope of the best-fit linear regression equation is close to the theoretical value 1. Our results provided another support of jet-disk symbiosis. (2) For FSRQ sample, we find a significant correlation between radio luminosity and optical luminosity, and weaker correlations between X-ray luminosity and radio, optical luminosity. It indicates that the X-ray band radiation mechanism is slightly different from radio and optical bands. The X-ray emission is diluted by inverse Compton scattering (IC). There is a significant correlation between BLR luminosity and \(\gamma\)-ray luminosity, but no correlations between X-ray luminosity and BLR, \(\gamma\)-ray luminosity, which suggests that the seed soft photons are different for IC process. From these results we suggest that the X-ray band emission is diluted by synchrotron self-Compton (SSC) process, \(\gamma\)-ray band emission is produced by external Compton (EC) process.
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Acknowledgements
This work is supported by the Joint Research Fund in Astronomy (Grant Nos. U1431123, 11263006, 10978019, 11463001) under cooperative agreement between the National Natural Science Foundation of China (NSFC) and Chinese Academy of Sciences (CAS), the Provincial Natural Science Foundation of Yunnan (Grant No.: 2013FZ042) and the Yunnan province education department project (Grant Nos. 2014Y138, 2016ZZX066).
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Wang, Z., Xue, R., Xie, Z. et al. The correlations of multi-wave band luminosity and BLR luminosity in Fermi 2LAC blazars. Astrophys Space Sci 362, 189 (2017). https://doi.org/10.1007/s10509-017-3164-2
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DOI: https://doi.org/10.1007/s10509-017-3164-2