Speaker
Description
From sources with presumably no significant radio emission to sources capable of forming and maintaining relativistic jets, narrow-line Seyfert 1 galaxies (NLS1s) have challenged paradigms. These sources are identified by their distinct spectral line features: the full width at half maximum being a maximum of 2000 km/s for the broad Hb component and S[O III]/S(Hb) < 3. However, due to the spectral profile of NLS1s being very similar to other sources when using low- to moderate-quality spectra, i.e., the majority of data currently available, the true characteristics of these sources as well as their parent population remain mostly unknown. Prior studies have suggested a possible connection between peaked sources (PS) and NLS1s. I am here to report on the preliminary results of a 5 GHz Very Long Baseline Array (VLBA) study on six NLS1s that have been identified as potential PS candidates in earlier studies. These results are the first radio maps of these sources at such a scale and resolution as obtained with 5 GHz VLBA. With the results obtained in this study, it is possible to take another step in understanding the NLS1 parent population and, in general, the unification of kinematically young jetted AGN.