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Correlation between radio and broad-line emissions in radio-loud quasars.pdf

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Correlation between radio and broad-line emissions in radio-loud quasars

a r X i v : a s t r o - p h / 9 9 0 4 3 2 2 v 1 2 3 A p r 1 9 9 9 Mon. Not. R. Astron. Soc. 000, 1–?? () Printed 1 February 2008 (MN LATEX style file v1.4) Correlation between radio and broad-line emissions in radio-loud quasars Xinwu Cao and D. R. Jiang Shanghai Observatory, Chinese Academy of Sciences, Shanghai, 200030, China; cxw@center.shao.ac.cn Accepted 1999 March 18. Received 1999 February 8; in original form 1999 January 5 ABSTRACT We present a correlation between radio and broad-line emission for a sample of radio- loud quasars, which is in favour of a close link between the accretion processes and the relativistic jets. The BL Lac objects seem to follow the statistical behaviour of the quasars, but with fainter broad-line emission. Key words: galaxies:active– galaxies:jets–quasars:emission lines 1 INTRODUCTION The relation between the jets and the accretion processes in the central ’engine’ is a crucial ingredient in our understanding of the physics of active galactic nuclei (AGN). In some theoretical models of the formation of the jet, the power is generated through accretion and then extracted from the disc/black hole rotational energy and converted into the kinetic power of the jet (Blandford Znajek; Blandford Payne 1982). Recently, the concept of jet-disc symbiosis was introduced and the inhomogeneous jet model plus mass and energy conservation in the jet-disc system was applied to study the relation between disc and jet luminosities (Falcke Biermann 1995; Falcke, Malkan Biermann 1995; Falcke Biermann 1998). An effective approach to study the link between these two phenomena is to explore the relationship between luminosity in line emission and kinetic power of jets in different scales (Rawlings Saunders 1991; Celotti, Padovani Ghisellini 1997; Cao Jiang 1998). Rawlings Saunders (1991) derived the total jet kinetic power Qjet and found a correlation between Qjet and the narrow line luminosity LNLR. There are some indications that the narr