Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-11-04
New Astron.Rev. 46 (2002) 61-65
Astronomy and Astrophysics
Astrophysics
LaTeX, 7 pages & 2 figs. Invited talk at `Lifecycles of Radio Galaxies' workshop, ed J. Biretta et al., New Astronomy Reviews.
Scientific paper
10.1016/S1387-6473(01)00157-9
In this paper we discuss the early phase of radio source evolution as represented by Gigahertz Peaked Spectrum (GPS) and Compact Steep Spectrum (CSS) radio sources. Correlations between their spectral peak and angular size strongly suggest that the spectral turnovers are caused by synchrotron self absorption, and indicate that young radio sources evolve in a self similar way. We argue that the evolution of a radio source during its first 10^5 years is qualitatively very different from that during the rest of its life-time. This may be caused by the difference in the density gradient of the intra-galactic medium inside and outside the core-radius of the host galaxy.
Schilizzi Richard
Snellen Ignas
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