EDGE: What shapes the relationship between HI and stellar observables in faint dwarf galaxies?

Abstract

We show how the interplay between feedback and mass-growth histories introduces scatter in the relationship between stellar and neutral gas properties of field faint dwarf galaxies ($M_{\star }⪅10^6{M}_{\odot }$). Across a suite of cosmological, high-resolution zoomed simulations, we find that dwarf galaxies of stellar masses $10^5\le M_{\star }\le 10^6{M}_{\odot }$ are bimodal in their cold gas content, being either HI-rich or HI-deficient. This bimodality is generated through the coupling between (i) the modulation of HI contents by the background of ultraviolet radiation (UVB) at late times and (ii) the significant scatter in the stellar-mass-halo-mass relationship induced by reionization. Furthermore, our HI-rich dwarfs exhibit disturbed and time-variable neutral gas distributions primarily due to stellar feedback. Over the last four billion years, we observe order-of-magnitude changes around the median $M_{HI}$, factor-of-a-few variations in HI spatial extents, and spatial offsets between HI and stellar components regularly exceeding the galaxies' optical sizes. Time variability introduces further scatter in the $M_{\star }-M_{HI}$ relation and affects a galaxy's detectability in HI at any given time. These effects will need to be accounted for when interpreting observations of the population of faint, HI-bearing dwarfs by the combination of optical and radio wide, deep surveys.

arXiv commentMatching MNRAS-accepted version after minor revisions. Results unchanged

References in corpus (103)

• Planck 2013 results. XVI. Cosmological parameters
• LSST: from Science Drivers to Reference Design and Anticipated Data Products
• Cosmological Hydrodynamics with Adaptive Mesh Refinement: a new high resolution code called RAMSES
• The observed properties of dwarf galaxies in and around the Local Group
• The Star Formation Law in Nearby Galaxies on Sub-Kpc Scales
• Radiative Transfer in a Clumpy Universe: II. The Utraviolet Extragalactic Background
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Physical Models of Galaxy Formation in a Cosmological Framework
• The Inner Structure of LambdaCDM Halos I: A Numerical Convergence Study
• How supernova feedback turns dark matter cusps into cores
• Theoretical Challenges in Galaxy Formation
• The Arecibo Legacy Fast ALFA Survey: The alpha.40 HI Source Catalog, its Characteristics and their Impact on the Derivation of the HI Mass Function
• The Faintest Dwarf Galaxies
• Massloss of galaxies due to a UV-background
• xCOLD GASS: the complete IRAM-30m legacy survey of molecular gas for galaxy evolution studies
• COLD GASS, an IRAM legacy survey of molecular gas in massive galaxies: I. Relations between H2, HI, stellar content and structural properties
• The dependence of dark matter profiles on the stellar to halo mass ratio: a prediction for cusps vs cores
• Towards a complete accounting of energy and momentum from stellar feedback in galaxy formation simulations
• HOP: A New Group-Finding Algorithm for N-body Simulations
• The GALEX Arecibo SDSS Survey. I. Gas Fraction Scaling Relations of Massive Galaxies and First Data Release
• Momentum Injection by Supernovae in the Interstellar Medium
• Forged in FIRE: cusps, cores, and baryons in low-mass dwarf galaxies
• The Evolution of the Intergalactic Medium
• RAMSES-RT: Radiation hydrodynamics in the cosmological context
• Milky Way Satellite Census. III. Constraints on Dark Matter Properties from Observations of Milky Way Satellite Galaxies
• Cold dark matter heats up
• Discovery of an Unusual Dwarf Galaxy in the Outskirts of the Milky Way
• Dwarf galaxies in voids: Suppressing star formation with photo-heating
• The formation of disc galaxies in a LCDM universe
• Supernova Feedback in an Inhomogeneous Interstellar Medium
• New Lessons from the HI Size-Mass Relation of Galaxies
• The History of the Baryon Budget: Cosmic Logistics in a Hierarchical Universe
• FIRE in the Field: Simulating the Threshold of Galaxy Formation
• Formation Histories of Dwarf Galaxies in the Local Group
• WALLABY -- An SKA Pathfinder HI Survey
• The GALFA-HI Survey: Data Release 1
• The stellar mass-halo mass relation of isolated field dwarfs: a critical test of $\Lambda$CDM at the edge of galaxy formation
• Extended Lyman-alpha emission from cold accretion streams
• Understanding the shape and diversity of dwarf galaxy rotation curves in LCDM
• Milky Way Satellite Census. II. Galaxy--Halo Connection Constraints Including the Impact of the Large Magellanic Cloud
• Be it therefore resolved: Cosmological Simulations of Dwarf Galaxies with Extreme Resolution
• In-N-Out: the gas cycle from dwarfs to spiral galaxies
• Gas kinematics, morphology, and angular momentum in the FIRE simulations
• Implementing Molecular Hydrogen in Hydrodynamic Simulations of Galaxy Formation
• The upper bound on the lowest mass halo
• The velocity width function of galaxies from the 40% ALFALFA survey: shedding light on the cold dark matter overabundance problem
• EDGE: the mass-metallicity relation as a critical test of galaxy formation physics
• Following the flow: tracer particles in astrophysical fluid simulations
• Ultra-faint dwarfs in a Milky Way context: Introducing the Mint Condition DC Justice League Simulations
• A Physical Model for the Luminosity Function of High-Redshift Quasars
• ALFALFA Discovery of the Nearby Gas-Rich Dwarf Galaxy Leo P. I. HI Observations
• Leo P: An Unquenched Very Low-Mass Galaxy
• How to quench a galaxy
• Pushing back the limits: detailed properties of dwarf galaxies in a LCDM universe
• The detailed structure and the onset of galaxy formation in low-mass gaseous dark matter haloes
• Modeling the atomic-to-molecular transition in cosmological simulations of galaxy formation
• Reionization simulations powered by GPUs I: the structure of the Ultraviolet radiation field
• Galactic Winds in Low-Mass Galaxies
• A Simple Model for Quasar Demographics
• Efficient early stellar feedback can suppress galactic outflows by reducing supernova clustering
• Models of the Thermal Evolution of the Intergalactic Medium After Reionization
• MIGHTEE-HI: The HI emission project of the MeerKAT MIGHTEE survey
• How to Quench a Dwarf Galaxy: The Impact of Inhomogeneous Reionization on Dwarf Galaxies and Cosmic Filaments
• A Catalog of Ultra-compact High Velocity Clouds from the ALFALFA Survey: Local Group Galaxy Candidates?
• A physical understanding of how reionization suppresses accretion onto dwarf halos
• The Imprint of Reionization on the Star Formation Histories of Dwarf Galaxies
• Abundance matching with the mean star formation rate: there is no missing satellites problem in the Milky Way above ${\mathbf{M}}_{200}\sim 10^9{\mathbf{M}}_{\odot }$
• Delayed Star Formation in Isolated Dwarf Galaxies: HST Star Formation History of the Aquarius Dwarf Irregular
• EDGE: From quiescent to gas-rich to star-forming low-mass dwarf galaxies
• The properties of "dark" ΛCDM halos in the Local Group
• EDGE: The origin of scatter in ultra-faint dwarf stellar masses and surface brightnesses
• Tangos: the agile numerical galaxy organization system
• Dancing in the Dark: Uncertainty in ultra-faint dwarf galaxy predictions from cosmological simulations
• ALFALFA Discovery of the Nearby Gas-rich Dwarf Galaxy Leo P. V. Neutral Gas Dynamics and Kinematics
• Reignition of Star Formation in Dwarf Galaxies
• Genetically modified halos: towards controlled experiments in $\Lambda$CDM galaxy formation
• EDGE: Two routes to dark matter core formation in ultra-faint dwarfs
• Antlia B: A faint dwarf galaxy member of the NGC 3109 association
• VoIgt profile Parameter Estimation Routine (VIPER): H I photoionization rate at z<0.5
• The edge of galaxy formation I: formation and evolution of MW-satellites analogues before accretion
• Late Gas accretion onto Primordial Minihalos: a Model for Leo T, Dark Galaxies and Extragalactic High-Velocity Clouds
• Deep neutral hydrogen observations of Leo T with the Westerbork Synthesis Radio Telescope
• Cosmological simulations of dwarfs: the need for ISM physics beyond SN feedback alone
• Eridanus II: A Fossil from Reionization with an Off-Center Star Cluster
• GenetIC -- a new initial conditions generator to support genetically modified zoom simulations
• The Power Spectrum of the Lyman-$\alpha$ Forest at z < 0.5
• The Leoncino Dwarf Galaxy: Exploring the Low-Metallicity End of the Luminosity-Metallicity and Mass-Metallcity Relations
• Quadratic genetic modifications: a streamlined route to cosmological simulations with controlled merger history
• A simple model for molecular hydrogen chemistry coupled to radiation hydrodynamics
• Thermodynamic evolution of cosmological baryonic gas: I. Influence of non-equipartition processes
• Accurate tracer particles of baryon dynamics in the adaptive mesh refinement code Ramses
• Where are All the Gas-Bearing Local Dwarf Galaxies? Quantifying Possible Impacts of Reionization
• The evolving AGN duty cycle in galaxies since z$\sim$3 as encoded in the X-ray luminosity function
• Sensitivity of dark matter haloes to their accretion histories
• The Enigmatic (Almost) Dark Galaxy Coma P: Distance Measurement and Stellar Populations from HST Imaging
• Five Gas-rich Ultra-faint Dwarf Galaxy Candidates Discovered in WIYN Imaging of ALFALFA Sources
• Reignited star formation in dwarf galaxies quenched during reionization
• Characterizing the Circumgalactic Medium of the Lowest-Mass Galaxies: A Case Study of IC 1613
• Predictions for the FAST telescope's CRAFTS Extra-Galactic HI Survey
• Hubble Space Telescope Imaging of Isolated Local Volume Dwarfs GALFA-Dw3 and Dw4
• The Tail of Late-forming Dwarf Galaxies in $\Lambda$CDM
• Modelling H${}_2$ and its effects on star formation using a joint implementation of GADGET-3 and KROME
• Galaxy Properties at the Faint End of the HI Mass Function

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• The Ly$\alpha$ and Continuum Origins Survey. III. Investigating the Link between Galaxy Morphology, Merger Properties and LyC Escape
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