Faint Gigahertz Peaked Spectrum sources and the evolution of young radio sources |
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| Institution: | 1. Department of Mathematics, Pondicherry Engineering College, Puducherry 605014, India;2. Department of Mathematics, Bharathidasan Government College for Women, Puducherry 605003, India;3. Department of Physics, Pondicherry University, Puducherry 605014, India;4. School of Basic Sciences, Indian Institute of Technology Bhubaneswar, Bhubaneswar 751007, India;1. Center for Data and Computing in Natural Sciences (CDCS), Notkestrasse 9-11, D-22607 Hamburg, Germany;2. Institute for Biomedical Imaging, Hamburg University of Technology, D-21073 Hamburg, Germany;3. Section for Biomedical Imaging, University Medical Center Hamburg-Eppendorf, D-20246 Hamburg, Germany;4. Universität Hamburg, Hamburger Sternwarte, Gojenbergsweg 112, D-21029 Hamburg, Germany;5. Institut für Experimentalphysik, University of Hamburg, Luruper Chaussee 149, D-22761 Germany;6. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, Hamburg D-22607, Germany |
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| Abstract: | GPS sources are the objects of choice to study the initial evolution of extragalactic radio sources, since it is most likely that they are the young counterparts of large scale radio sources. Correlations found between their peak frequency, peak flux density and angular size provide strong evidence that synchrotron self absorption is the cause of the spectral turnovers, and indicate that young radio sources evolve in a self-similar way. The difference in redshift distribution between young and old radio sources must be due to a difference in slope of their luminosity functions, and we argue that this slope is strongly affected by the luminosity evolution of the individual sources. A luminosity evolution scenario is proposed in which GPS sources increase in luminosity and large scale radio sources decrease in luminosity with time. It is shown that such a scenario agrees with the local luminosity function of GPS galaxies. |
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