Properties and redshift evolution of star-forming galaxies with high [OIII]/[OII] ratios with MUSE at 0.28<z<0.85

Abstract

We present a study of the [OIII]5007/[OII]3727 (O32) ratios of star-forming galaxies drawn from MUSE data spanning a redshift range 0.28<z<0.85. Recently discovered Lyman continuum (LyC) emitters have extremely high oxygen line ratios: O32>4. Here we aim to understand the properties and the occurrences of galaxies with such high line ratios. Combining data from several MUSE GTO programmes, we select a population of star-forming galaxies with bright emission lines, from which we draw 406 galaxies for our analysis based on their position in the z-dependent star formation rate (SFR) - stellar mass (M*) plane. Out of this sample 15 are identified as extreme oxygen emitters based on their O32 ratios (3.7%) and 104 galaxies have O32>1 (26%). Our analysis shows no significant correlation between M*, SFR, and the distance from the SFR-M* relation with O32. We find a decrease in the fraction of galaxies with O32>1 with increasing M*, however, this is most likely a result of the relationship between O32 and metallicity, rather than between O32 and M*. We draw a comparison sample of local analogues with <z>~0.03 from SDSS, and find similar incidence rates for this sample. In order to investigate the evolution in the fraction of high O32 emitters with redshift, we bin the sample into three redshift subsamples of equal number, but find no evidence for a dependence on redshift. Furthermore, we compare the observed line ratios with those predicted by nebular models with no LyC escape and find that most of the extreme oxygen emitters can be reproduced by low metallicity models. The remaining galaxies are likely LyC emitter candidates. Finally, based on a comparison between electron temperature estimates from the [OIII4363]/[OIII]5007 ratio of the extreme oxygen emitters and nebular models, we argue that the galaxies with the most extreme O32 ratios have young light-weighted ages.

arXiv comment17 pages, 23 figures, accepted for publication in A&A

References in corpus (73)

• Stellar population synthesis at the resolution of 2003
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• The Host Galaxies of AGN
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• The physical properties of star forming galaxies in the low redshift universe
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• The COSMOS2015 Catalog: Exploring the 1<z<6 Universe with half a million galaxies
• An ultra-deep near-infrared spectrum of a compact quiescent galaxy at z=2.2
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The Star-formation Mass Sequence out to z=2.5
• The MUSE second-generation VLT instrument
• Constraining the Low-Mass Slope of the Star Formation Sequence at 0.5<z<2.5
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• The chemical composition of metal-poor emission-line galaxies in the Data Release 3 of the Sloan Digital Sky Survey
• Strong Nebular Line Ratios in the Spectra of z~2-3 Star-forming Galaxies: First Results from KBSS-MOSFIRE
• Galaxy Zoo Green Peas: Discovery of A Class of Compact Extremely Star-Forming Galaxies
• Nebular Emission from Star-Forming Galaxies
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Detection of high Lyman continuum leakage from four low-redshift compact star-forming galaxies
• Modelling the nebular emission from primeval to present-day star-forming galaxies
• Low-redshift Lyman continuum leaking galaxies with high [OIII]/[OII] ratios
• The Universal Relation of Galactic Chemical Evolution: The Origin of the Mass-Metallicity Relation
• The MOSDEF Survey: Electron Density and Ionization Parameter at $z\sim 2.3$
• Ubiquitous giant Ly $\alpha$ nebulae around the brightest quasars at $z\sim 3.5$ revealed with MUSE
• Lyman continuum leaking from the compact star-forming dwarf galaxy J0925+1403
• On the redshift-evolution of the Lyman-alpha escape fraction and the dust content of 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
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• A Turnover in the Galaxy Main Sequence of Star Formation at $M_{\ast }\sim 10^{10}{M}_{\odot }$ for Redshifts $z<1.3$
• Ly$\alpha$ emission from Green Peas: the role of circumgalactic gas density, covering, and kinematics
• J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons
• Green Pea Galaxies and cohorts: Luminous Compact Emission-Line Galaxies in the Sloan Digital Sky Survey
• Galaxies with Wolf-Rayet signatures in the low-redshift Universe - A survey using the Sloan Digital Sky Survey
• Lyman-alpha spectral properties of five newly discovered Lyman continuum emitters
• The Star Formation Main Sequence in the Hubble Space Telescope Frontier Fields
• A Local Clue to the Reionization of the Universe
• Hubble imaging of the ionizing radiation from a star-forming galaxy at z=3.2 with fesc>50%
• An extreme [OIII] emitter at $z=3.2$: a low metallicity Lyman continuum source
• The Optical Depth of H II Regions in the Magellanic Clouds
• Direct Lyman continuum and Lyman-alpha escape observed at redshift 4
• UVUDF: Ultraviolet Through Near-infrared Catalog and Photometric Redshifts of Galaxies in the Hubble Ultra Deep Field
• The MUSE Hubble Ultra Deep Field Survey: II. Spectroscopic redshifts and comparisons to color selections of high-redshift galaxies
• Escape of Lyman continuum radiation from local galaxies - Detection of leakage from the young starburst Tol 1247-232
• Q1549-C25: A Clean Source of Lyman-Continuum Emission at $z=3.15$
• Direct Detection of Lyman Continuum Escape from Local Starburst Galaxies with the Cosmic Origins Spectrograph
• A Deep Hubble and Keck Search for Definitive Identification of Lyman Continuum Emitters at z~3.1
• The zCOSMOS 20k Group Catalog
• Green Pea Galaxies Reveal Secrets of Ly$\alpha$ Escape
• The MUSE-Wide Survey: A first catalogue of 831 emission line galaxies
• A Hard Ionizing Spectrum in z=3-4 Ly-alpha Emitters with Intense [OIII] Emission: Analogs of Galaxies in the Reionization Era?
• The Lyman Continuum escape fraction of galaxies at z=3.3 in the VUDS-LBC/COSMOS field
• Excitation properties of galaxies with the highest [OIII]/[OII] ratios: No evidence for massive escape of ionizing photons
• Synthetic nebular emission from massive galaxies I: origin of the cosmic evolution of optical emission-line ratios
• A High-Resolution Hubble Space Telescope Study of Apparent Lyman Continuum Leakers at $z\sim 3$
• The Field X-ray AGN Fraction to z=0.7 from the Chandra Multiwavelength Project and the Sloan Digital Sky Survey
• Stars were born in significantly denser regions in the early Universe
• Peering through the holes: the far UV color of star-forming galaxies at z~3-4 and the escaping fraction of ionizing radiation
• Do galaxies that leak ionizing photons have extreme outflows?
• The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
• LBT observations of compact star-forming galaxies with extremely high [OIII]/[OII] flux ratios: HeI emission-line ratios as diagnostics of Lyman continuum leakage
• Estimating gas masses and dust-to-gas ratios from optical spectroscopy
• LSDCat: Detection and cataloguing of emission-line sources in integral-field spectroscopy datacubes
• [NeIII]/[OII] as an Ionization Parameter Diagnostic in Star-Forming Galaxies
• The Lyman Continuum escape fraction of emission line-selected $z\sim 2.5$ galaxies is less than 15%
• Mrk 71/NGC 2366: The nearest Green Pea analog
• Ionised gas structure of 100 kpc in an over-dense region of the galaxy group COSMOS-Gr30 at z ~ 0.7
• Dark Galaxy Candidates at Redshift ~3.5 Detected with MUSE
• z~1 Lya Emitters I. The Luminosity Function
• Ly$\alpha$ and UV Sizes of Green Pea Galaxies
• Investigating the relationship between AGN activity and stellar mass in zCOSMOS galaxies at 0<z<1 using emission line diagnostic diagrams

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