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    • On the Absence of Core Luminosity–Core-Dominance Parameter (𝑃C - 𝑅) Correlation in Radio Galaxies and BL Lacs

      J. A. Alhassan A. A. Ubachukwu F. C. Odo

      Research Articles Volume 34 Issue 1 March 2013 pp 61-67

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      https://www.ias.ac.in/article/fulltext/joaa/034/01/0061-0067

    • Keywords

       

      BL Lacertae objects: general-quasars; galaxies: Seyfert; galaxies: jets

    • Abstract

       

      We have presented an alternative interpretation for the absence of correlation in the relationship between the core radio power (𝑃C) and core-dominance parameter (𝑅) for a sample of BL Lacs and radio galaxies found in Fan & Zhang (Astron. Astrophys. 407, 899 (2003)). This is contrary to the predictions of the relativistic beaming and radio source orientation models in which the core luminosity is expected to be Doppler-boosted relative to the extended luminosity which is generally assumed to be isotropic. Our analysis of the 𝑃C - 𝑅 data indicates a strong luminosity selection effect (reminiscent of bright source samples due to Malmquist bias) in the sample. In particular, we showed that a strong 𝑃C - 𝑅 correlation exists above some redshift cut-off which may correspond to the flux limit of the sample used.

    • Author Affiliations

       

      J. A. Alhassan1 A. A. Ubachukwu1 F. C. Odo1 2

      1. Department of Physics & Astronomy, University of Nigeria, Nsukka, Nigeria.
      2. National Centre for Energy Research and Development, University of Nigeria, Nsukka, Nigeria.

    • Dates

       
      Published
      March 2013
      Manuscript received
      7 February 2012
      Accepted
      28 January 2013

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