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Environmental effects on structural asymmetry in extragalactic radio sources and quasar/galaxy unification

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Abstract

We use the anti-correlation between arm-length ratio (Q) and flux density ratio (F) as asymmetry parameters to investigate the effects of environment on observed structural asymmetries in extragalactic radio sources. In a density variation model (DVM) the Q–F anti-correlation can be understood in the framework of varying beam power due to varying density profile of the environment through which the jets propagate. We find that the variations of Q and F are statistically different for radio galaxies and quasars, with radio galaxies being more consistent with DVM asymmetries than quasars. Linear regression analyses yield significant Q–F anti-correlation which dominates at an upper envelope data, with correlation coefficients r ~ − 0.9 and − 0.7, respectively, for radio galaxies and quasars. All these results are not only consistent with quasar/galaxy unification scheme but suggest that environmental effects contribute significantly to the observed structural asymmetries in extragalactic radio sources.

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Acknowledgements

We are very grateful to the anonymous referees for their invaluable comments and suggestions which have significantly improved this paper.

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Authors and Affiliations

  1. Department of Physics, Federal University of Technology, Owerri, Nigeria

    C. I. Onah

  2. Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria

    A. A. Ubachukwu & F. C. Odo

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  1. C. I. Onah
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  2. A. A. Ubachukwu
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  3. F. C. Odo
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Correspondence to C. I. Onah.

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Onah, C.I., Ubachukwu, A.A. & Odo, F.C. Environmental effects on structural asymmetry in extragalactic radio sources and quasar/galaxy unification. Eur. Phys. J. Plus 136, 576 (2021). https://doi.org/10.1140/epjp/s13360-021-01475-z

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