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Astron. Astrophys. 358, 841-844 (2000)

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Research Note

Relation between [FORMULA]-rays and emission lines for the [FORMULA]-ray loud blazars

J.H. Fan

1 Center for Astrophysics, Guangzhou Normal University, Guangzhou 510400, P.R. China (jhfan@guangztc.edu.cn)
2 Chinese Academy of Sciences-Peking University Joint Beijing Astrophysical Center (CAS-PKU.BAC), Beijing, P.R. China
3 CCAST(World Laboratory), P.O. Box 8730, Beijing 100080, P.R. China

Received 20 January 2000 / Accepted 30 March 2000


The relation between the [FORMULA]-ray and the emission line luminosities for a sample of 36 [FORMULA]-ray loud blazars is investigated; an apparent correlation between them, [FORMULA], with a correlation coefficient [FORMULA] and a chance probability of [FORMULA], is found. It is found, however, that there is no intrinsic correlation between them: the apparent correlation is due to the redshift dependence in a flux-limited sample. Thus no evidence is found to support the argument that the up-scattered soft photons are from the broad emission lines. Our analysis does not conflict with the SSC model. The disk-jet symbiosis and radio/[FORMULA]-ray correlation found in the literature are also discussed. The radio/[FORMULA]-ray correlation may be an apparent correlation caused by the boosting effect since both bands are strongly beamed.

Key words: galaxies: quasars: emission lines – galaxies: jets – galaxies: nuclei – galaxies: active

SIMBAD Objects


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© European Southern Observatory (ESO) 2000

Online publication: June 20, 2000