Open AccessNarrow‐line Seyfert 1 galaxies and the evolution of galaxies and active galaxies
Author(s) -
Mathur Smita
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03530.x
Subject(s) - physics , astrophysics , active galactic nucleus , galaxy , quasar , luminous infrared galaxy , astronomy , redshift , accretion (finance) , luminosity , galaxy formation and evolution , radio galaxy
Narrow Line Seyfert 1 galaxies (NLS1s) are intriguing owing to their continuum as well as emission‐line properties. The observed peculiar properties of the NLS1s are believed to be as a result of an accretion rate close to the Eddington limit. As a consequence of this, for a given luminosity, NLS1s have smaller black hole (BH) masses compared with normal Seyfert galaxies. Here we argue that NLS1s might be Seyfert galaxies in their early stage of evolution and as such may be low‐redshift, low‐luminosity analogues of high‐redshift quasars. We propose that NLS1s may reside in rejuvenated, gas‐rich galaxies. We also argue in favour of collisional ionization for production of Fe ii in active galactic nuclei.