NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-19 T12:57:05 PDT
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For refcode 2003A&A...407..899F:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2003A&A...407..899F The core dominance parameter of extragalactic radio sources J. H. Fan and J. S. Zhang Received 20 January 2003 / Accepted 12 June 2003 In this paper, based on a paper by Liu and Zhang (2002), we have chosen a sample of 542 extragalactic sources (27 BL Lac objects, 300 galaxies (radio galaxies and Seyfert galaxies), and 215 quasars), for which we have calculated the core-dominance parameters and investigated the relation between core-dominance parameter and the core and extended luminosities. The core-dominance parameter of galaxies is smaller than that in quasars, which is smaller than that in BL Lac objects. log R = -1.40 +/- 0.74 for galaxies, log R = -0.53 +/- 0.92 for quasars, and log R = 0.01 +/- 0.65 for BL Lac objects on average respectively. For quasars, there is clear correlation between the core-luminosity and core-dominance parameter and an anti-correlation between the extended luminosity and the core-dominance parameter, which is explained by the beaming effect. Keywords: BL Lacertae objects: general, quasars: general, galaxies: Seyfert, galaxies: jets
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