Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003arep...47...81t&link_type=abstract
Astronomy Reports, vol. 47, Issue 2, p.81-87
Astronomy and Astrophysics
Astronomy
Scientific paper
The possibility of estimating the redshifts of radio sources based on radio continuum observations is demonstrated. Since the pressure exerted on the intergalactic medium by radio lobes is associated only with their total energy, while the pressure exerted on the radio lobes by the intergalactic medium depends on the redshift, the redshift can be estimated. The proposed method does not require the use of standard candles or standard sizes for any features. Consequently, it is free of the influence of cosmological evolution of the radio sources. Our insufficient knowledge of the density and temperature of the intergalactic medium prevents us from applying the method to obtain direct estimates of the distances to extragalactic radio sources. Therefore, a method designed to enable indirect estimation of the source distances has also been developed.
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