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Multifrequency study of Narrow-Line Seyfert 1 galaxies

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Title: Multifrequency study of Narrow-Line Seyfert 1 galaxies
Author(s): Järvelä, Emilia
Contributor: University of Helsinki, Faculty of Science, Department of Physics
Discipline: Astronomy
Language: English
Acceptance year: 2014
High-energy γ-rays produced by powerful relativistic jets are usually associated with blazars and radio galaxies. Recently Fermi/LAT detected γ-rays from a few Narrow-Line Seyfert 1 galaxies and thus confirmed the presence of relativistic jets in those sources. In the current AGN paradigm powerful relativistic jets are almost exclusively launched from massive elliptical galaxies. Since NLSy1s are young evolving AGN they offer a unique opportunity to study the production of relativistic jets in late-type galaxies. In this study our aim is to determine via which processes and where different kinds of radiation are produced in NLSy1s. We compiled the so far largest multiwavelength database of NLSy1s which allowed us to explore correlations between different wavebands. We did this separately for radio loud and radio quiet sources. Multiwavelength correlations indicate that radio loud sources host a jet whereas radio quiet sources do not or the jet is very weak. Kolmogorov-Smirnov test suggests also that radio quiet and radio loud sources have different parent populations in redshift, luminosity and black hole mass. Open questions aroused also by this study are e.g. the origin of the infrared emission in NLSy1s and the differences between radio quiet and radio loud sources. In the future the large multiwavelength database of NLSy1s will permit us to easily identify and compare properties of new γ-ray NLSy1s to be detected by Fermi or other facilities.

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