Synthetic nebular emission from massive galaxies II: ultraviolet-line diagnostics of dominant ionizing sources

Abstract

We compute synthetic optical and ultraviolet (UV) emission-line properties of galaxies in a full cosmological framework by coupling, in post-processing, new-generation nebular-emission models with high-resolution, cosmological zoom-in simulations of massive galaxies. Our self-consistent modelling accounts for nebular emission from young stars and accreting black holes (BHs). We investigate which optical- and UV-line diagnostic diagrams can best help to discern between the main ionizing sources, as traced by the ratio of BH accretion to star formation rates in model galaxies, over a wide range of redshifts. At low redshift, simulated star-forming galaxies, galaxies dominated by active galactic nuclei and composite galaxies are appropriately differentiated by standard selection criteria in the classical [OIII]$\lambda$5007/H$\beta$ versus [NII]$\lambda$6584/H$\alpha$ diagram. At redshifts $z>1$, however, this optical diagram fails to discriminate between active and inactive galaxies at metallicities below $0.5Z_{\odot }$. To robustly classify the ionizing radiation of such metal-poor galaxies, which dominate in the early Universe, we confirm 3 previous, and propose 11 novel diagnostic diagrams based on equivalent widths and luminosity ratios of UV emission lines, such as EW(OIII]$\lambda$1663) versus OIII]$\lambda$1663/HeII$\lambda$1640, CIII]$\lambda$1908/HeII$\lambda$1640 versus OIII]$\lambda$1663/HeII$\lambda$1640, and CIV$\lambda$1550/CIII]$\lambda$1908 versus CIII]$\lambda$1908/CII$\lambda$2326. We formulate associated UV selection criteria and discuss some caveats of our results (e.g., uncertainties in the modelling of the HeII$\lambda$1640 line). These UV diagnostic diagrams are potentially important for the interpretation of high-quality spectra of very distant galaxies to be gathered by next-generation telescopes, such as the James Webb Space Telescope.

arXiv comment23 pages, 10 figures, submitted to MNRAS

References in corpus (87)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• Stellar population synthesis at the resolution of 2003
• Galactic Stellar and Substellar Initial Mass Function
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Host Galaxies of AGN
• Theoretical Modeling of Starburst Galaxies
• Modeling feedback from stars and black holes in galaxy mergers
• [O III]/[N II] as an Abundance Indicator at High Redshift
• A Simple Model for the Absorption of Starlight by Dust in Galaxies
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• Physical Models of Galaxy Formation in a Cosmological Framework
• Constraining the Evolution of the Ionizing Background and the Epoch of Reionization with z ~ 6 Quasars II: A Sample of 19 Quasars
• Constraints on the relationship between stellar mass and halo mass at low and high redshift
• The Structure and Kinematics of the Circum-Galactic Medium from Far-UV Spectra of z~2-3 Galaxies
• AMAZE. I. The evolution of the mass-metallicity relation at z>3
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• The MAPPINGS III Library of Fast Radiative Shock Models
• Solar Chemical Abundances Determined with a CO5BOLD 3D Model Atmosphere
• The Two Phases of Galaxy Formation
• Theoretical Challenges in Galaxy Formation
• The SINS survey of z~2 galaxy kinematics: properties of the giant star forming clumps
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• The transition from Population III to normal galaxies: Ly-a and HeII 1640 emission and the ionising properties of high redshift starburst galaxies
• Heavy element abundances in blue compact galaxies
• Nebular Emission from Star-Forming Galaxies
• Theoretical Evolution of Optical Strong Lines across Cosmic Time
• Cosmological simulations of black hole growth: AGN luminosities and downsizing
• Reconciling the Stellar and Nebular Spectra of High Redshift Galaxies
• The cosmological size and velocity dispersion evolution of massive early-type galaxies
• Gas metallicity diagnostics in star-forming galaxies
• SDSS IV MaNGA - Spatially resolved diagnostic diagrams: A proof that many galaxies are LIERs
• On Measuring Chemical Abundances in Distant Galaxies Using Global Emission Line Spectra
• Modelling the nebular emission from primeval to present-day star-forming galaxies
• Nuclear activity versus star formation: emission-line diagnostics at ultraviolet and optical wavelengths
• Dust in the reionization era: ALMA observations of a $z$=8.38 Galaxy
• UV to Mid-IR Observations of Star-forming Galaxies at z~2: Stellar Masses and Stellar Populations
• SDSS IV MaNGA - Metallicity and nitrogen abundance gradients in local galaxies
• Physical Conditions in a Young, Unreddened, Low Metallicity Galaxy at High Redshift
• Momentum Driving: which physical processes dominate AGN feedback?
• Towards a more realistic population of bright spiral galaxies in cosmological simulations
• Galaxy-Wide Shocks in Late-Merger Stage Luminous Infrared Galaxies
• Nebular Emission Line Ratios in z~2-3 Star-Forming Galaxies with KBSS-MOSFIRE: Exploring the Impact of Ionization, Excitation, and Nitrogen-to-Oxygen Ratio
• Spectroscopic detection of CIV in a galaxy at z=7.045: Implications for the ionizing spectra of reionization-era galaxies
• Strongly star forming galaxies in the local Universe with nebular He II 4686 emission
• The SINS/zC-SINF survey of z~2 galaxy kinematics: Outflow properties
• The MOSDEF Survey: Excitation Properties of $z\sim 2.3$ Star-forming Galaxies
• Planck intermediate results. XLVII. Planck constraints on reionization history
• Ultraviolet Emission Lines in Young Low Mass Galaxies at z~2: Physical Properties and Implications for Studies at z>7
• Radiative and Momentum Based Mechanical AGN Feedback in a 3-Dimensional Galaxy Evolution Code
• AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
• Ultraviolet spectra of extreme nearby star-forming regions --- approaching a local reference sample for JWST
• Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
• Rest-Frame Optical Spectra of Three Strongly Lensed Galaxies at z~2
• The MOSDEF Survey: Optical AGN Diagnostics at z~2.3
• Physical conditions in the ISM of intensely star-forming galaxies at redshift~2
• The sub-mJy radio sky in the Extended Chandra Deep Field South: source population
• The Properties and Prevalence of Galactic Outflows at z = 1 in the Extended Groth Strip
• The VIMOS Ultra Deep Survey: Nature, ISM properties, and ionizing spectra of CIII]1909 emitters at z=2-4
• SPHGal: Smoothed Particle Hydrodynamics with improved accuracy for Galaxy simulations
• The evolution of metallicity and metallicity gradients from z=2.7-0.6 with KMOS3D
• A Window On The Earliest Star Formation: Extreme Photoionization Conditions of a High-Ionization, Low-Metallicity Lensed Galaxy at z~2
• NGC 839: Shocks in an M82-like Superwind
• X-ray binaries as the origin of nebular HeII emission in low-metallicity star-forming galaxies
• High-resolution spectroscopy of a young, low-metallicity optically-thin L=0.02L* star-forming galaxy at z=3.12
• NIR Spectroscopy of Star-Forming Galaxies at z~1.4 with Subaru/FMOS: The Mass-Metallicity Relation
• Photoionization Models for the Semi-Forbidden C III] 1909 Emission in Star-Forming Galaxies
• The Role of Black Hole Feedback on Size and Structural Evolution in Massive Galaxies
• A young star-forming galaxy at z = 3.5 with an extended Ly\,$\alpha$ halo seen with MUSE
• Ultraviolet Diagnostics for the Emission Line Gas in Active Galaxies
• The Rest Frame Ultraviolet Spectra of UV-Selected Active Galactic Nuclei at z ~ 2-3
• Synthetic nebular emission from massive galaxies I: origin of the cosmic evolution of optical emission-line ratios
• Physical properties and H-ionizing-photon production rates of extreme nearby star-forming regions
• The effect of metal enrichment and galactic winds on galaxy formation in cosmological zoom simulations
• Magnifying the early episodes of star formation: super star clusters at cosmological distances
• Galaxy formation in semi-analytic models and cosmological hydrodynamic zoom simulations
• Modelling ultraviolet-line diagnostics of stars, the ionized and the neutral interstellar medium in star-forming galaxies
• The nebular emission of star-forming galaxies in a hierarchical universe
• Metallicity evolution of AGNs from UV emission-lines based on a new index
• Photoionization models of the CALIFA HII regions. I. Hybrid models
• Physics of Galactic Metals: Evolutionary Effects due to Production, Distribution, Feedback & Interaction with Black Holes
• Stellar and nebular diagnostics in the UV for star-forming galaxies
• Momentum-driven Winds from Radiatively Efficient Black Hole Accretion and Their Impact on Galaxies
• AGN-enhanced outflows of low-ionization gas in star-forming galaxies at 1.7<z<4.6
• Modeling for Stellar Feedback in Galaxy Formation Simulations
• Photometric identification and MMT spectroscopy of new extremely metal-poor galaxies: towards a better understanding of young stellar populations at low metallicity
• Nebular line emission from z > 7 galaxies in cosmological simulations: rest-frame UV to Optical lines
• The XMM Deep Survey in the CDF-S VII. UV catalogue of the Optical Monitor observations

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