A bottom-up search for Lyman-continuum leakage in the Hubble Ultra Deep Field

Abstract

Context: Studies of the production and escape of Lyman Continuum from galaxies often rely on array of indirect observational tracers in preselection of candidate leakers. Aims: Here, we investigate how much ionizing radiation might be missed due to these selection criteria by completely removing them and performing a search selected purely from rest-frame LyC emission; and how that affects our estimates of the ionizing background. Methods: We invert the conventional method and perform a bottom-up search for Lyman-continuum leaking galaxies at redshifts $2<z<3.5$. Using archival data from HST and VLT/MUSE, we run source finding software on UV-filter HST images from the HUDF, and subject all detected sources to a series of tests to eliminate those that are inconsistent with being ionizing sources. Results: We find 6 new and one previously identified candidate leakers with absolute escape fractions ranging from 36% to 100%. Our filtering criteria eliminate one object previously reported as a candidate ionizing emitter in the literature, while we report non-detection in the rest frame Lyman continuum of two other previously reported sources. We find that our candidates make a contribution to the metagalactic ionizing field of ${\log }_{10}({\epsilon }_{\nu })=25.32(+0.25)(-0.21)$ and $25.29(+0.27)(-0.22)$ erg/s/Hz/cMpc${}^3$ for the full set of candidates and for the 4 strongest candidates only; both values are higher than but consistent with other recent figures in the literature. Conclusions: Our findings suggest that galaxies that do not meet the usual selection criteria may make a non-negligible contribution to the cosmic ionizing field. We recommend that similar searches be carried out on a larger scale in well-studied fields with both UV and large ancillary data coverage, for example in the full set of CANDELS fields.

arXiv comment22 pages, 8 tables, 12 figures. This is the version accepted for publication in A&A. Contains only minor edits from v1

References in corpus (99)

• Stellar population synthesis at the resolution of 2003
• The Dust Content and Opacity of Actively Star-Forming Galaxies
• Cosmic Star Formation History
• EAZY: A Fast, Public Photometric Redshift Code
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies
• Radiative transfer in a clumpy universe: IV. New synthesis models of the cosmic UV/X-ray background
• Bayesian photometric redshift estimation
• Importance Nested Sampling and the MultiNest Algorithm
• Cosmic Reionization and Early Star-Forming Galaxies: A Joint Analysis of New Constraints from Planck and Hubble Space Telescope
• The Hubble Ultra Deep Field
• Inferring the star-formation histories of massive quiescent galaxies with BAGPIPES: Evidence for multiple quenching mechanisms
• Observational constraints on Cosmic Reionization
• UV Luminosity Functions from 132 z~7 and z~8 Lyman-Break Galaxies in the ultra-deep HUDF09 and wide-area ERS WFC3/IR Observations
• The Abundance of Star-Forming Galaxies in the Redshift Range 8.5 to 12: New Results from the 2012 Hubble Ultra Deep Field Campaign
• An updated analytic model for the attenuation by the intergalactic medium
• Galaxies in the Hubble Ultra Deep Field: I. Detection, Multiband Photometry, Photometric Redshifts, and Morphology
• Keck Spectroscopy of Faint 3<z<7 Lyman Break Galaxies: - I. New constraints on cosmic reionisation from the luminosity and redshift-dependent fraction of Lyman-alpha emission
• Lyman Continuum Emission from Galaxies at z~3.4
• Cosmic Reionization after Planck: Could Quasars Do It All?
• Cosmic Variance and Its Effect on the Luminosity Function Determination in Deep High z Surveys
• 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
• Conditions for Reionizing the Universe with A Low Galaxy Ionizing Photon Escape Fraction
• Low-redshift Lyman continuum leaking galaxies with high [OIII]/[OII] ratios
• New Measurements of the Ionizing Ultraviolet Background over 2 < z < 5 and Implications for Hydrogen Reionization
• The Keck Lyman Continuum Spectroscopic Survey (KLCS): The Emergent Ionizing Spectrum of Galaxies at $z\sim 3$
• Hydrogen reionisation ends by $z=5.3$: Lyman-$\alpha$ optical depth measured by the XQR-30 sample
• A Cosmic Variance Cookbook
• Using Lyman-alpha to detect galaxies that leak Lyman continuum
• Rapid Reionization by the Oligarchs: The Case for Massive, UV-Bright, Star-Forming Galaxies with High Escape Fractions
• 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
• The Origin and Optical Depth of Ionizing Radiation in the "Green Pea" Galaxies
• J1154+2443: a low-redshift compact star-forming galaxy with a 46 per cent leakage of Lyman continuum photons
• Structure and Morphologies of z~7-8 Galaxies from ultra-deep WFC3/IR Imaging of the HUDF
• A Cosmic UV/X-ray Background Model Update
• The MUSE 3D view of the Hubble Deep Field South
• Faint Galaxies in deep ACS observations
• 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 Lyman Continuum Escape Survey: Ionizing Radiation from [O III]-Strong Sources at a Redshift of 3.1
• 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
• The Low-Redshift Lyman Continuum Survey I: New, Diverse Local Lyman-Continuum Emitters
• Escape of Lyman continuum radiation from local galaxies - Detection of leakage from the young starburst Tol 1247-232
• The 2012 Hubble Ultra Deep Field (UDF12): Observational Overview
• New Constraints on the Lyman Continuum Escape Fraction at z~1.3
• A Refined Estimate of the Ionizing Emissivity from Galaxies at z~3: Spectroscopic Follow-up in the SSA22a Field
• Q1549-C25: A Clean Source of Lyman-Continuum Emission at $z=3.15$
• A Deep HST Search for Escaping Lyman Continuum Flux at z~1.3: Evidence for an Evolving Ionizing Emissivity
• The mean free path of ionizing photons at 5 < z < 6: evidence for rapid evolution near reionization
• The VLT-FLAMES Tarantula Survey - XI. A census of the hot luminous stars and their feedback in 30 Doradus
• Direct Detection of Lyman Continuum Escape from Local Starburst Galaxies with the Cosmic Origins Spectrograph
• On The Detection Of Ionizing Radiation Arising From Star-Forming Galaxies At Redshift z ~ 3-4 : Looking For Analogs Of "Stellar Reionizers"
• Gravitational lensing reveals ionizing ultraviolet photons escaping from a distant galaxy
• Accurately predicting the escape fraction of ionizing photons using restframe ultraviolet absorption lines
• Measuring the Sources of the Intergalactic Ionizing Flux
• New Insights on Ly-alpha and Lyman Continuum Radiative Transfer in the Greenest Peas
• Reionization with galaxies and active galactic nuclei
• Testing massive star evolution, star-formation history and feedback at low metallicity : Spectroscopic analysis of OB stars in the SMC Wing
• Spectroscopic Measurements of the Far-Ultraviolet Dust Attenuation Curve at z~3
• Lyman Radiation Hydrodynamics of Turbulent H II Regions in Molecular Clouds: A Physical Origin of LyC Leakage and the Associated Ly$\alpha$ Spectra
• The Lyman Continuum escape fraction of galaxies at z=3.3 in the VUDS-LBC/COSMOS field
• Beamed Lyman Alpha Emission through Outflow-Driven Cavities
• A High-Resolution Hubble Space Telescope Study of Apparent Lyman Continuum Leakers at $z\sim 3$
• The Lyman Continuum escape fraction of faint galaxies at z~3.3 in the CANDELS/GOODS-North, EGS, and COSMOS fields with LBC
• Reducing low signal-to-noise FUSE spectra: confirmation of Lyman continuum escape from Haro 11
• The Lyman Continuum Escape Survey -- II: Ionizing Radiation as a Function of the [OIII]/[OII] Line Ratio
• UVUDF: Ultraviolet Imaging of the Hubble Ultradeep Field with Wide-field Camera 3
• Peering through the holes: the far UV color of star-forming galaxies at z~3-4 and the escaping fraction of ionizing radiation
• The Lyman Continuum Escape Fraction of Low-Mass Star-Forming Galaxies at z~1
• A new technique for finding galaxies leaking Lyman-continuum radiation: [SII]-deficiency
• (Re)Solving Reionization with Lyα: How Bright Lyα Emitters account for the $z\approx 2-8$ Cosmic Ionizing Background
• Haro 11: Where is the Lyman continuum source?
• Stellar population of the superbubble N206 in the LMC II. Parameters of the OB and WR stars, and the total massive star feedback
• The Lyman Continuum Escape Fraction of The Cosmic Horseshoe: A Test of Indirect Estimates
• The Lyman Continuum escape fraction of emission line-selected $z\sim 2.5$ galaxies is less than 15%
• HST Imaging of the Ionizing Radiation from a Star-forming Galaxy at z = 3.794
• On the Lack of Correlation Between [OIII]/[OII] and Lyman-Continuum Escape Fraction
• No strong dependence of Lyman continuum leakage on physical properties of star-forming galaxies at $3.1\lesssim \mathbf{z}\lesssim 3.5$
• Lyman continuum galaxies and the escape fraction of Lyman break galaxies
• The UV-brightest Lyman continuum emitting star-forming galaxy
• The Lyman Continuum Escape and ISM properties in Tololo 1247-232 - New Insights from HST and VLA
• AstroSat detection of Lyman continuum emission from a z=1.42 galaxy
• Kinematics of Haro11 - the miniature Antennae
• The impact of Stellar feedback from velocity-dependent ionised gas maps. -- A MUSE view of Haro 11
• The Predicament of Absorption-Dominated Reionization: Increased Demands on Ionizing Sources
• The source of leaking ionizing photons from Haro11 -- Clues from HST/COS spectroscopy of knots A, B and C
• Stellar population of the superbubble N206 in the LMC I. Analysis of the Of-type stars
• Lyman Continuum Escape Fraction from Low-mass Starbursts at z=1.3
• IGM Transmission Bias for $z$ $\ge$ 2.9 Lyman Continuum Detected Galaxies
• Lyman Continuum Emission Escaping from Luminous Green Pea Galaxies at z=0.5
• Ionized gas properties of the extreme starburst galaxy Haro 11. Temperature and metal abundance discrepancies
• Candidate z ~ 2.5 Lyman Continuum Sources in the GOODS Fields
• A Cautionary Tale of LyC Escape Fraction Estimates from High Redshift Galaxies
• Discovery of O stars in the tidal Magellanic Bridge: Stellar parameters, abundances, and feedback of the nearest metal-poor massive stars and their implication for the Magellanic System ecology

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• The Low-Redshift Lyman Continuum Survey: Optically Thin and Thick Mg II Lines as Probes of Lyman Continuum Escape
• Detections of [C II] 158 $\mu$m and [O III] 88 $\mu$m in a Local Lyman Continuum Emitter, Mrk 54, and its Implications to High-redshift ALMA Studies
• The Lyman-alpha and Continuum Origins Survey II: the connection between the escape of ionizing radiation and Lyman-alpha halos in star-forming galaxies
• Photometric IGM tomography with Subaru/HSC: the large-scale structure of Ly$\alpha$ emitters and IGM transmission in the COSMOS field at $z\sim 5$
• A Lyman continuum analysis for $\sim 100$ galaxies at $z_{\text{spec}}\sim 3$ in the Abell 2744 Cluster Field
• Lyman Continuum escaping from in-situ formed stars in a tidal bridge at z = 3