Selection effects in the observed variation of spectral index with redshift |
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| Authors: | A A Ubachukwu A C Ugwoke J N Ogwo |
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| Institution: | (1) Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria;(2) Department of Industrial Physics, Enugu State University of Technology, Adada Campus, Nigeria;(3) Abia State University, Uturu, Nigeria |
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| Abstract: | The observed dependences of the spectral indices ( ) of extragalactic radio sources on redshift (z) and radio luminosity (P) are investigated taking into account the possible luminosity selection effects in bright source samples. Using the steep spectrum (>0.5) extended (D>20 Kpc) sources from a compilation of three complete samples, the contribution of the luminosity selection effects to the observed -z relation is quantitatively estimated.We show that a highly significant fraction ( 54%) of the observed spectral steepening with redshift can be attributed to these luminosity selection effects present in most well-studied flux density-limited samples. |
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