The line-emitting gas in active galaxies - A probe of the nuclear engine

Sylvain Veilleux
1993 Publications of the Astronomical Society of the Pacific  
This paper reviews some of the basic questions regarding the structure of the engine powering active galactic nuclei (AGN), the nature of the interaction between the AGN and the host galaxy, and the origin and evolution of AGN. The study of the dynamics and physical characteristics of the line-emitting gas in these objects has proven fruitful in addressing many of these issues. Recent advances in optical and infrared detector technology combined with the development of superior ground-based
more » ... or ground-based instruments have produced efficient new tools for the study of the line-emitting gas on nuclear (R % 1 pc) and galactic {R £ 50 pc) scales. Programs which take advantage of two of these new techniques, Fabry-Perot imaging spectroscopy and infrared spectroscopy, are described in this paper. The origin of nuclear activity in galaxies is also addressed in a third project which aims at determining the nature of luminous infrared galaxies.
doi:10.1086/133279 fatcat:fifl6imdlzbxbdqq447vz5zzma