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Cosmological Size Evolution of Extragalactic Radio Sources

Published online by Cambridge University Press:  25 May 2016

Ashok K. Singal
Ashok K. Singal*
Affiliation:
Physical Research Laboratory Astronomy Astrophysics Division Navrangpura, Ahmedabad - 380 009, India. E-mail: [email protected]

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The study of cosmological evolution of the sizes of extragalactic radio sources started about a quarter century back. From the very first angular size-redshift (θ-z) plots (Miley 1968, 1971; Legg 1970) and angular size-flux density (θ-S) plots (Swarup 1975; Kapahi 1975) it became evident that some sort of cosmic epoch-dependent evolution in the size distribution for the population of extragalactic radio source needs to be proposed; the sources at earlier epochs appeared on the average to have smaller physical sizes. However, a suitable luminosity-linear size (P-l) correlation among the radio source population could also explain the observations, without invoking a size evolution with redshift. The only reliable way to disentangle these two separate effects is to investigate the size distribution in the luminosity-redshift plane, where one could examine not only the l-z relation for a given luminosity class, but could also check for a P-l correlation in a given redshift bin.

Type
Cosmological Implications
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 563 - 566
Copyright
Copyright © Kluwer 1996 

References

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