Narrow-Line Seyfert 1 Galaxies

Abstract

I provide a short review of the properties of Narrow-line Seyfert 1 (NLS1) galaxies across the electromagnetic spectrum and of the models to explain them. Their continuum and emission-line properties manifest one extreme form of Seyfert activity. As such, NLS1 galaxies may hold important clues to the key parameters that drive nuclear activity. Their high accretion rates close to the Eddington rate provide new insight into accretion physics, their low black hole masses and perhaps young ages allow us to address issues of black hole growth, their strong optical FeII emission places strong constraints on FeII and perhaps metal formation models and physical conditions in these emission-line clouds, and their enhanced radio quiteness permits a fresh look at causes of radio loudness and the radio-loud radio-quiet bimodality in AGN.

To appear in the proceedings of "The nuclear region, host galaxy and environment of AGN", E. Benitez, I. Cruz-Gonzalez & Y. Krongold (eds), RevMexAA

Cited by in corpus (16)

• The Sloan Digital Sky Survey Reverberation Mapping Project: Initial CIV Lag Results from Four Years of Data
• Radio jet emission from GeV-emitting narrow-line Seyfert 1 galaxies
• Broad Line Radio Galaxies Observed with Fermi-LAT: The Origin of the GeV Gamma-Ray Emission
• Investigating kpc-scale radio emission properties of narrow-line Seyfert 1 galaxies
• An orientation-based unification of young jetted AGN: the case of 3C 286
• Evidence for an Optical Low-frequency Quasi-Periodic Oscillation in the Kepler Light Curve of an Active Galaxy
• Tracking the year-to-year variation in the spectral energy distribution of the Narrow-line Seyfert 1 Galaxy Mrk335
• SDSS J094635.06+101706.1: a redshift one, very radio-loud, γ-ray emitting narrow-line Seyfert 1 galaxy
• NuSTAR observations of Mrk 766: distinguishing reflection from absorption
• Probing Spectroscopic Variability of Galaxies & Narrow-Line Active Galactic Nuclei in the Sloan Digital Sky Survey
• Spectroscopic classification, variability and SED of the Fermi-detected CSS 3C 286: the radio-loudest NLS1 galaxy?
• GEMINI 3D spectroscopy of BAL+IR+Fe II QSOs: II. IRAS 04505-2958 an explosive QSO with hypershell and a new scenario for galaxy formation and galaxy end
• Intra-night optical variability of $\gamma -$ray detected narrow-line Seyfert 1 galaxies
• The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average
• Central accumulation of magnetic flux in massive Seyfert galaxies as a possible engine to trigger ultrahigh energy cosmic rays
• The Narrow-Line Region of Narrow-Line Seyfert 1 Galaxies