Intense CIII] 1907,1909 emission from a strong Lyman continuum emitting galaxy

Abstract

We have obtained the first complete ultraviolet (UV) spectrum of a strong Lyman continuum(LyC) emitter at low redshift -- the compact, low-metallicity, star-forming galaxy J1154+2443 -- with a Lyman continuum escape fraction of 46% discovered recently. The Space Telescope Imaging Spectrograph spectrum shows strong Lya and CIII] 1909 emission, as well as OIII] 1666. Our observations show that strong LyC emitters can have UV emission lines with a high equivalent width (e.g. EW(CIII])$=11.7\pm 2.9\mathring{A}$ rest-frame), although their equivalent widths should be reduced due to the loss of ionizing photons. The intrinsic ionizing photon production efficiency of J1154+2443 is high, $\log ({\xi }_{\mathrm{ion}}^0)=25.56$ erg${}^{-1}$ Hz, comparable to that of other recently discovered $z\sim 0.3-0.4$ LyC emitters. Combining our measurements and earlier determinations from the literature, we find a trend of increasing ${\xi }_{\mathrm{ion}}^0$ with increasing CIII] 1909 equivalent width, which can be understood by a combination of decreasing stellar population age and metallicity. Simple ionization and density-bounded photoionization models can explain the main observational features including the UV spectrum of J1154+2443.

arXiv comment5 pages, 4 figures. Accepted for publication in A&A Letters

References in corpus (32)

• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• The transition from Population III to normal galaxies: Ly-a and HeII 1640 emission and the ionising properties of high redshift starburst galaxies
• New Constraints on Cosmic Reionization from the 2012 Hubble Ultra Deep Field Campaign
• Heavy element abundances in blue compact galaxies
• The Interstellar Medium In Galaxies Seen A Billion Years After The Big Bang
• Lyman-alpha and CIII] Emission in z=7-9 Galaxies: Accelerated Reionization Around Luminous Star Forming Systems?
• Ionization State of Inter-Stellar Medium in Galaxies: Evolution, SFR-M_star-Z Dependence, and Ionizing Photon Escape
• 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
• Physical Conditions in a Young, Unreddened, Low Metallicity Galaxy at High Redshift
• Lyman continuum leaking from the compact star-forming dwarf galaxy J0925+1403
• J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons
• Ultraviolet Emission Lines in Young Low Mass Galaxies at z~2: Physical Properties and Implications for Studies at z>7
• Predicted UV properties of very metal-poor starburst galaxies
• The spectral evolution of the first galaxies. II. Spectral signatures of Lyman continuum leakage from galaxies in the reionization epoch
• Ultraviolet spectra of extreme nearby star-forming regions --- approaching a local reference sample for JWST
• Carbon and Oxygen Abundances in Low Metallicity Dwarf Galaxies
• The Evolution of C/O in Dwarf Galaxies from HST Fos Observations
• Direct Detection of Lyman Continuum Escape from Local Starburst Galaxies with the Cosmic Origins Spectrograph
• The VIMOS Ultra Deep Survey: Nature, ISM properties, and ionizing spectra of CIII]1909 emitters at z=2-4
• A Window On The Earliest Star Formation: Extreme Photoionization Conditions of a High-Ionization, Low-Metallicity Lensed Galaxy at z~2
• Accurately predicting the escape fraction of ionizing photons using restframe ultraviolet absorption lines
• The IRX-Beta Dust Attenuation Relation in Cosmological Galaxy Formation Simulations
• Photoionization Models for the Semi-Forbidden C III] 1909 Emission in Star-Forming Galaxies
• Neutral gas properties of Lyman continuum emitting galaxies: column densities and covering fractions from UV absorption lines
• Physical properties and H-ionizing-photon production rates of extreme nearby star-forming regions
• Dissecting the IRX - $\beta$ dust attenuation relation: exploring the physical origin of observed variations in galaxies
• The ionizing photon production efficiency of compact z~0.3 Lyman continuum leakers and comparison with high redshift galaxies
• The Mean Ultraviolet Spectrum of a Representative Sample of Faint z~3 Lyman Alpha Emitters
• The MUSE Hubble Ultra Deep Field Survey: IV. Global properties of C III] emitters
• Lyman continuum leakage versus quenching with the James Webb Space Telescope: The spectral signatures of quenched star formation activity in reionization-epoch galaxies

Cited by in corpus (24)

• Constraining the metallicities, ages, star formation histories, and ionizing continua of extragalactic massive star populations
• The COS Legacy Archive Spectroscopy SurveY (CLASSY) Treasury Atlas
• New Insights into the Evolution of Massive Stars and Their Effects on Our Understanding of Early Galaxies
• EMPRESS. V. Metallicity Diagnostics of Galaxies over 12+log(O/H)=~6.9-8.9 Established by a Local Galaxy Census: Preparing for JWST Spectroscopy
• The Lyman Continuum Escape Survey -- II: Ionizing Radiation as a Function of the [OIII]/[OII] Line Ratio
• Intense CIV and HeII Emission in z~0 Galaxies: Probing High-Energy Ionizing Photons
• The Effects of Stellar Population and Gas Covering Fraction on the Emergent Lyman Alpha Emission of High-Redshift Galaxies
• HST Imaging of the Ionizing Radiation from a Star-forming Galaxy at z = 3.794
• Strong Lyman continuum emitting galaxies show intense CIV 1550 emission
• No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $3.1\lesssim \mathbf{z}\lesssim 3.5$
• Ultraviolet spectra of extreme nearby star-forming regions: evidence for an overabundance of very massive stars
• Reconciling escape fractions and observed line emission in Lyman-continuum-leaking galaxies
• The Semi-forbidden CIII]$\lambda$1909Å~ Emission in the Rest-Ultraviolet Spectra of Green Pea Galaxies
• The VANDELS survey: A strong correlation between Ly$\alpha$ equivalent width and stellar metallicity at $3\le \mathbf{z}\le 5$
• Recovery and analysis of rest-frame UV emission lines in 2052 galaxies observed with MUSE at $1.5<z<6.4$
• Abundances of CNO elements in z ~ 0.3-0.4 LyC leaking galaxies
• Photon leaking or very hard ionizing radiation? Unveiling the nature of heII-emitters using the softness diagram
• A double-peaked Lyman-$\alpha$ emitter with a strong blue peak multiply imaged by the galaxy cluster RXC J0018.5+1626
• Early Results from GLASS-JWST. XXV. Electron Density in the Interstellar Medium at $0.7\lesssim z\lesssim 9.3$ with NIRSpec High-resolution Spectroscopy
• Spectroscopy of CASSOWARY gravitationally-lensed galaxies in SDSS: characterisation of an extremely bright reionization-era analog at $z=1.42$
• Linking UV spectral properties of MUSE Ly-alpha emitters at z>3 to Lyman continuum escape
• Spatially resolved CIII]$\lambda$1909 emission in Haro 11
• Ionizing Radiation Escape from Low-Redshift Galaxies and Its Connection to Cosmic Reionization
• Ciii]$\lambda 1909$ emission as an alternative to Ly$\alpha$ in the reionization era: the dependence of Ciii] and Ly$\alpha$ at $3<z<4$ from the VANDELS survey