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Zajacek, Michal
Masaryk University
in Cooperation with on an Cooperation-Score of 37%
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document
Galaxy evolution across optical emission-line diagnostic diagrams: towards lower radio flux densities
Abstract
In a previous study to understand the role of AGN feedback in galaxy evolution we performed a spectral index study of a sample of 119 intermediate redshift SDSS-FIRST sources with the Effelsberg 100-m telescope at 4.85 and 10.45 GHz (see Vitale et al., 2015). The sample included star-forming galaxies, composite galaxies, Seyferts and LINER galaxies obeying a flux density limit of ≥ 100 mJy at 1.4 GHz. While searching for possible spectral evolution and a link between the radio/optical emission we found indications for radio spectral index flattening in high-metallicity star-forming galaxies, composite galaxies and Seyferts. Galaxies of this "flattening sequence" along the [NII]-based emission line diagnostic diagrams are likely transitioning from the active star-forming galaxies (blue cloud) to the passive elliptical galaxies (red sequence) suggesting that AGN play a key role in quenching star formation as well as galaxy evolution as a whole. Currently, we are extending our previous findings on the grounds of a much larger sample with lower radio flux densities of ≥ 10 mJy. Here, we present first results of this follow-up Effelsberg observations for a sample of about 400 additional sources....