Semi-empirical metallicity calibrations based on ultraviolet emission lines of type-2 AGNs

Abstract

We derived two semi-empirical calibrations between the metallicity of the Narrow Line Region (NLR) of type-2 Active Galactic Nuclei and the rest-frame of the N V$\lambda$1240/He II$\lambda 1640$, C43=log[(C IV$\lambda 1549$+C III]$\lambda 1909$)/HeII$\lambda 1640$] and C III]$\lambda 1909$/C IV$\lambda 1549$ emission-line intensity ratios. A metallicity-independent calibration between the ionization parameter and the C III]$\lambda 1909$/C IV$\lambda 1549$ emission-lines ratio was also derived. These calibrations were obtained comparing ratios of measured UV emission-line intensities, compiled from the literature, for a sample of 77 objects (redshift $0<z<3.8$) with those predicted by a grid of photoionization models built with the Cloudy code. Using the derived calibrations, it was possible to show that the metallicity estimations for NLRs are lower by a factor of about 2-3 than those for Broad Line Regions (BLRs). Besides we confirmed the recent result of the existence of a relation between the stellar mass of the host galaxy and its NLR metallicity. We also derived a $M-Z$ relation for the objects in our sample at $1.6<z<3.8$. This relation seems to follow the same trend as the ones estimated for Star Forming galaxies of similar high redshifts but for higher masses.

arXiv comment15 pages, MNRAS accepted

References in corpus (65)

• The Sloan Digital Sky Survey: Technical Summary
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• The 'Forbidden' Abundance of Oxygen in the Sun
• AMAZE. I. The evolution of the mass-metallicity relation at z>3
• De Re Metallica: The cosmic chemical evolution of galaxies
• The Stellar, Gas and Dynamical Masses of Star-Forming Galaxies at z~2
• The Gemini Deep Deep Survey. VII. The Redshift Evolution of the Mass-Metallicity Relation
• Reverberation Measurements of the Inner Radius of the Dust Torus in Nearby Seyfert 1 Galaxies
• A Reappraisal of the Solar Photospheric C/O Ratio
• The Composition Gradient in M101 Revisited. II. Electron Temperatures and Implications for the Nebular Abundance Scale
• Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths
• New calibrations for abundance determinations in HII regions
• Emission-line Diagnostics of Low Metallicity AGN
• On the oxygen abundance determination in HII regions: High - metallicity regions
• Deriving model-based T${}_e$-consistent chemical abundances in ionised gaseous nebulae
• Modelling the Pan-Spectral Energy Distribution of Starburst Galaxies: III. Emission Line Diagnostics of Ensembles of Evolving HII Regions
• Keck HIRES Spectroscopy of Extragalactic HII Regions: C and O Abundances from Recombination Lines
• Integral field spectroscopy of a sample of nearby galaxies: II. Properties of the H ii regions
• Metallicities and Abundance Ratios from Quasar Broad Emission Lines
• On the abundance discrepancy problem in HII regions
• Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
• The localized chemical pollution in NGC 5253 revisited: Results from deep echelle spectrophotometry
• Gas Metallicity in the Narrow-Line Regions of High-Redshift Active Galactic Nuclei
• The ionizing stars of extragalactic H II regions
• IZI: Inferring the Gas Phase Metallicity (Z) and Ionization Parameter (q) of Ionized Nebulae using Bayesian Statistics
• A grid of chemical evolution models as a tool to interpret spiral and irregular galaxies data
• Chemical Abundance Calibrations for the Narrow-Line-Region of Active Galaxies
• Quasar Elemental Abundances at High Redshifts
• X-ray Emission from Optically Selected Radio-Intermediate and Radio-Loud Quasars
• "Counterpart" method for abundance determinations in HII regions
• Carbon and oxygen abundances from recombination lines in low-metallicity star-forming galaxies. Implications for chemical evolution
• Optical Recombination Lines of Heavy-elements in Giant Extragalactic HII Regions
• Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. I. Spatially Resolved Mass Outflow Rates for the Seyfert 2 Galaxy Markarian 573
• The mass-metallicity relation at z~1.4 revealed with Subaru/FMOS
• The Metal Abundances across Cosmic Time ($\mathcal{M}\mathcal{A}\mathcal{C}\mathcal{T}$) Survey. II. Evolution of the Mass-Metallicity Relation over 8 Billion Years, using [OIII]$\lambda$4363Å-based Metallicities
• Chemical Evolution of High-Redshift Radio Galaxies
• [ArIII]/[OIII] and [SIII]/[OIII]: well-behaved oxygen abundance indicators for HII regions and star forming galaxies
• Analyzing derived metallicities and ionization parameters from model-based determinations in ionized gaseous nebulae
• Metallicity evolution of AGNs from UV emission-lines based on a new index
• Metallicity calibrations for diffuse ionised gas and low ionisation emission regions
• Photoionization models of the CALIFA HII regions. I. Hybrid models
• Massive star formation in Wolf-Rayet galaxies: II. Optical spectroscopy results
• Is There a Metallicity--Luminosity Relationship in AGN? The Case of Narrow-Line Seyfert 1 Galaxies
• Interrogating Seyferts with NebulaBayes: Spatially probing the narrow-line region radiation fields and chemical abundances
• Physical Conditions in the Narrow-Line Region of M51
• Quantifying Feedback from Narrow Line Region Outflows in Nearby Active Galaxies. II. Spatially Resolved Mass Outflow Rates for the QSO2 Markarian 34
• A Recalibration of Strong Line Oxygen Abundance Diagnostics via the Direct Method and Implications for the High Redshift Universe
• On the central abundances of Active Galactic Nuclei and Star-forming Galaxies
• The mass-metallicity relation of local active galaxies
• The chemical properties of low-redshift QSOs
• New quantitative nitrogen abundance estimations in a sample of Seyfert 2 Active Galactic Nuclei
• New metallicity calibration for Seyfert 2 galaxies based on the N2O2 index
• The mass-metallicity relation of high-z type-2 active galactic nuclei
• Modelling narrow-line regions of active galaxies in the Sloan Digital Sky Survey - I.Sample selection and physical conditions
• Carbon and Nitrogen Abundance Ratio In the Broad Line Region of Tidal Disruption Events
• Re-examining High Abundance SDSS Mass-Metallicity Outliers: High N/O, Evolved Wolf-Rayet Galaxies?
• Imaging and Spectroscopy of Ultra Steep Spectrum Radio Sources
• Chemical evolution of the Universe at 0.7 < z < 1.6 derived from abundance diagnostics of the broad-line region of quasars
• Using photo-ionisation models to derive carbon and oxygen gas-phase abundances in the rest UV
• Quasars with Super Metal Rich Emission Line Regions
• Nature and chemical abundances of a sample of Lyman-$\alpha$ emitter objects at high redshift
• N/O abundance ratios in gamma-ray burst and supernova host galaxies at z<4. Comparison with AGN, starburst and HII regions
• When Photoionization Is Not Enough

Cited by in corpus (20)

• MUSE Analysis of Gas around Galaxies (MAGG) -- III: The gas and galaxy environment of z = 3-4.5 quasars
• A bayesian-like approach to derive chemical abundances in Type-2 Active Galactic Nuclei based on photoionization models
• Metal enrichment in the circumgalactic medium and Lyα haloes around quasars at z $\sim$3
• Chemical abundances of Seyfert 2 AGNs I. Comparing oxygen abundances from distinct methods using SDSS
• Chemical abundances in Seyfert galaxies -- V. The discovery of shocked emission outside the AGN ionization axis
• Metallicity in Quasar Broad Line Regions at Redshift $\sim$ 6
• Optical and mid-infrared line emission in nearby Seyfert galaxies
• Chemical Abundance of z~6 Quasar Broad-Line Regions in the XQR-30 Sample
• Chemical abundances of Seyfert 2 AGNs IV. Composite models calculated by photoionization + shocks
• Gas phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA: evidence of metal poor accretion
• Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity-luminosity relation
• Measuring chemical abundances in AGN from infrared nebular lines: HII-CHI-Mistry-IR for AGN
• The mass-metallicity and fundamental metallicity relations in non-AGN and AGN-host galaxies
• Chemical abundances in Seyfert galaxies X. Sulphur abundance estimates
• Chemical Abundance of the LINER galaxy UGC 4805 with SDSS-IV MaNGA
• Cosmic Ray Ionization of Low-Excitation Lines in Active Galactic Nuclei and Starburst Galaxies
• Polycyclic aromatic hydrocarbons and the ionized gas
• Assessing model-based carbon and oxygen abundance derivation from ultraviolet emission lines in AGNs
• Exploring the hardness of the ionizing radiation with the infrared softness diagram. II. Bimodal distributions in both the ionizing continuum slope and the excitation in active galactic nuclei
• Chemical abundances in Seyfert galaxies -- VII. Direct abundance determination of neon based on optical and infrared emission lines