Variability of Optical \ion{Fe}{ii} Complex in Narrow-Line Seyfert 1 Galaxy NGC 4051

Abstract

The variability of optical FeII blends in NGC 4051 is examined from spectra extracted from the AGN Watch program.In our analysis, the FeII complex are subtracted and measured with the following results. Firstly, the FeII variations were detected in NGC 4051 during a 3-year period. The identified FeII variations followed the variations in continuum closely. Secondly, the EW of FeII is reported to increase with the rising continuum flux, which is consistent with previous claims that there is no convincing Baldwin Effect in optical FeII. Thirdly, by comparing the variations of H$\beta$ and FeII, we find that RFe scales with continuum flux as ${\mathrm{R}}_{\mathrm{Fe}}\propto (5.0\pm 0.8)\log (L/M)$, which is significantly different from the theoretical expectations. Finally, in six selected Seyferts, four out of five Narrow-Line Seyfert 1 galaxies present positive correlation between RFe and the continuum flux. The negative correlations are identified in the remaindng two objects that have relatively broad profiles of H$\beta$ ($\mathrm{FWHM}>1500km{\mathrm{s}}^{-1}$).We argue that the difference of electron density of broad line clouds and/or variability behavior of incident high-energy radiation can explain the dichotomy in variability behavior of RFe.

arXiv comment27 pages, 9 figures, accepted by A&A

References in corpus (27)

• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio-Loud and Radio-Quiet QSOs
• Elemental Abundances in QSOs: Star Formation and Galactic Nuclear Evolution at High Redshifts
• Eigenvector 1: An Optimal Correlation Space for Active Galactic Nuclei
• The unusual emission line spectrum of IZw1
• Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
• A spectrophotometric atlas of Narrow-Line Seyfert 1 galaxies
• What the Optical Recombination Lines Can Tell Us About the Broad Line Regions of Active Galactic Nuclei
• X-Ray and Optical Variability in NGC 4051 and the Nature of Narrow-Line Seyfert 1 Galaxies
• An Atlas of Computed Equivalent Widths of Quasar Broad Emission Lines
• Searching for the Physical Drivers of the Eigenvector 1 Correlation Space
• The UV Properties of the Narrow Line Quasar I Zwicky 1
• Searching For the Physical Drivers of Eigenvector 1: Influence of Black Hole Mass and Eddington Ratio
• Kinematic Linkage Between the Broad and Narrow Line Emitting Gas in AGN
• Predicted FeII Emission-Line Strengths from Active Galactic Nuclei
• Evidence for an outflow from the Seyfert galaxy NGC 4051
• The Demise of the Classical BLR in the Luminous Quasar PG1416-129
• Short-term emission line and continuum variations in Mrk110
• Lyman Alpha Fluorescent Excitation of FeII in Active Galactic Nuclei
• On the black-hole mass -- radio luminosity relation for flat-spectrum radio-loud quasars
• An Intrinsic Baldwin Effect in the H-beta Broad Emission Line in the Spectrum of NGC 5548
• Theoretical FeI/II/III Emission-Line Strengths from Active Galactic Nuclei with Broad-Line Regions
• Is the slope of the intrinsic Baldwin effect constant?
• Searching for the Physical Drivers of Eigenvector-1: From Quasars to Nano-Quasars
• An AGN Sample with High X-ray-to-optical Flux Ratio from RASS II.Optical Emission Line Properties of Seyfert 1 Type AGN
• FeII and FeI emission in IRAS 07598+6508 and PHL 1092
• Supersolar metal abundances and the Broad Line Region of Narrow-line Seyfert 1 galaxies

Cited by in corpus (19)

• The Lick AGN Monitoring Project 2011: Fe II Reverberation from the Outer Broad-Line Region
• A Systematic Analysis of Fe II Emission in Quasars: Evidence for Inflow to the Central Black Hole
• Investigating the nature of narrow-line Seyfert 1 galaxies with high-energy spectral complexity
• Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. III. Detection of Fe II Reverberation in Nine Narrow-Line Seyfert 1 Galaxies
• Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564
• What controls the Fe II strength in active galactic nuclei?
• VLT/ISAAC Spectra of the H-beta Region in Intermediate Redshift Quasars
• VLT/ISAAC Spectra of the H-beta Region in Intermediate-Redshift Quasars II. Black Hole Mass and Eddington Ratio
• On the size of the Fe II emitting region in the AGN Akn 120
• A Sample of IRAS Infrared-Selected Seyfert 1.5 Galaxies: Infrared-Color $\alpha (60,25)$ Dominated Eigenvector 1
• Fe II emission in active galactic nuclei
• The variability of optical \feii emission in PG QSO 1700+518
• Fantastic Fits with fantasy of Active Galactic Nuclei Spectra -- Exploring the Fe II emission near the H$\alpha$ line
• Line profile and continuum variability in the very broad-line Seyfert galaxy Mrk 926
• Evolutionary Implications from SDSSJ085338.27+033246.1: A Spectacular N arrow-Line Seyfert 1 Galaxy with Young Post-starburst
• The optical emission line spectrum of Mark 110
• Unveiling the quasar main sequence: illuminating the complexity of active galactic nuclei and their evolution
• Taming the derivative: diagnostics of the continuum and H$\beta$ emission in a prototypical Population B active galaxy
• The CaFe Project: Optical FeII and Near-Infrared Ca II triplet emission in active galaxies. II. The driver(s) of the Ca II and Fe II and its potential use as a chemical clock