Narrow-line Seyfert 1 galaxies - rebels of the AGN family

TL;DR

This paper investigates the unique properties of Narrow-line Seyfert 1 galaxies through extensive statistical analysis, exploring their emission mechanisms, intrinsic properties, and large-scale environments to better understand their role in AGN evolution.

Contribution

It provides a comprehensive multiwavelength analysis of NLS1s, introduces the Mets"ahovi Radio Observatory survey, and presents early findings on their environments and individual sources.

Findings

Multiwavelength correlations reveal emission connections in NLS1s.

Principal component analysis uncovers key intrinsic properties.

Initial results suggest diverse large-scale environments for NLS1s.

Abstract

Narrow-line Seyfert 1 galaxies, with their extreme properties, defy our current knowledge of active galactic nuclei and relativistic jet systems. They excite, and might help us answer, many questions concerning the evolution and unification of AGN, but still remain a poorly studied class of AGN as such. We did an extensive study of a large sample of NLS1s using various statistical methods, for example, multiwavelength correlations and principal component analysis. We wanted to examine how and where in NLS1s different kinds of radiation are produced, and how the emission properties are connected to other intrinsic AGN properties. In addition we present the early results of our ongoing research about the large-scale environments of NLS1s. We also introduce the Mets\"ahovi Radio Observatory NLS1 survey and its first results, and show some early results for individual sources.