When H II Regions are Complicated: Considering Perturbations from Winds, Radiation Pressure, and Other Effects

Abstract

We explore to what extent simple algebraic models can be used to describe H II regions when winds, radiation pressure, gravity and photon breakout are included. We a) develop algebraic models to describe the expansion of photoionised H II regions under the influence of gravity and accretion in power-law density fields with $\rho \propto r^{-w}$, b) determine when terms describing winds, radiation pressure, gravity and photon breakout become significant enough to affect the dynamics of the H II region where $w=2$, and c) solve these expressions for a set of physically-motivated conditions. We find that photoionisation feedback from massive stars is the principal mode of feedback on molecular cloud scales, driving accelerating outflows from molecular clouds in cases where the peaked density structure around young massive stars is considered at radii between $\sim$0.1 and 10-100 pc. Under a large range of conditions the effect of winds and radiation on the dynamics of H II regions is around 10% of the contribution from photoionisation. The effect of winds and radiation pressure are most important at high densities, either close to the star or in very dense clouds such as those in the Central Molecular Zone of the Milky Way. Out to $\sim$0.1 pc they are the principal drivers of the H II region. Lower metallicities make the relative effect of photoionisation even stronger as the ionised gas temperature is higher.

20 pages, 13 figures, accepted by MNRAS

References in corpus (66)

• Galactic Stellar and Substellar Initial Mass Function
• Binary interaction dominates the evolution of massive stars
• Control of star formation by supersonic turbulence
• Grids of stellar models with rotation - I. Models from 0.8 to 120 Msun at solar metallicity (Z = 0.014)
• On the Star Formation Rates in Molecular Clouds
• Obliquities of Hot Jupiter host stars: Evidence for tidal interactions and primordial misalignments
• The Disruption of Giant Molecular Clouds by Radiation Pressure and the Efficiency of Star Formation in Galaxies
• The Effects of Stellar Rotation. II. A Comprehensive Set of Starburst99 Models
• Turbulent molecular clouds
• The statistical Analysis of Star Clusters
• RAMSES-RT: Radiation hydrodynamics in the cosmological context
• The Dynamics of Radiation Pressure-Dominated HII Regions
• The SPHINX Cosmological Simulations of the First Billion Years: the Impact of Binary Stars on Reionization
• Before the first supernova: combined effects of HII regions and winds on molecular clouds
• The H II Region of the First Star
• The Interplay of Magnetic Fields, Fragmentation and Ionization Feedback in High-Mass Star Formation
• On Radiation Pressure in Static, Dusty HII Regions
• The SILCC project: III. Regulation of star formation and outflows by stellar winds and supernovae
• Ambipolar diffusion in low-mass star formation. I. General comparison with the ideal MHD case
• A scheme for radiation pressure and photon diffusion with the M1 closure in RAMSES-RT
• Direct Numerical Simulation of Radiation Pressure-Driven Turbulence and Winds in Star Clusters and Galactic Disks
• Wind modelling of very massive stars up to 300 solar masses
• The Optical Depth of H II Regions in the Magellanic Clouds
• Dynamical Expansion of Ionization and Dissociation Front around a Massive Star. II. On the Generality of Triggered Star Formation
• The formation of massive stars: accretion, disks and the development of hypercompact HII regions
• The Mass-Size Relation from Clouds to Cores. II. Solar Neighborhood Clouds
• Winds and radiation in unison: a new semi-analytic feedback model for cloud dissolution
• Numerical Simulations of Radiatively-Driven Dusty Winds
• Larson's third law and the universality of molecular cloud structure
• First hydrodynamics simulations of radiation forces and photoionization feedback in massive star formation
• A Detailed Study of Feedback from a Massive Star
• A Magnetically-Supported Photodissociation Region in M17
• Understanding the escape of LyC and Ly$\alpha$ photons from turbulent clouds
• The relative impact of photoionizing radiation and stellar winds on different environments
• One Dimensional Dynamical Models of the Carina Nebula Bubble
• Protostellar birth with ambipolar and ohmic diffusion
• Orion's Bar: Physical Conditions across the Definitive H+ / H0 / H2 Interface
• StarBench: The D-type expansion of an HII region
• Self-similar champagne flows in HII regions
• Stellar feedback efficiencies: supernovae versus stellar winds
• Feedback in Clouds II: UV Photoionisation and the first supernova in a massive cloud
• Photoionisation Feedback in a Self-Gravitating, Magnetised, Turbulent Cloud
• Radiation Feedback in ULIRGS: Are Photons Movers and Shakers?
• WARPFIELD 2.0: Feedback-regulated minimum star formation efficiencies of giant molecular clouds
• Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
• An Off-center Density Peak in the Milky Way's Dark Matter Halo?
• Ionization Parameter as a Diagnostic of Radiation and Wind Pressures in H II Regions and Starburst Galaxies
• Suppression of star formation in dwarf galaxies by grain photoelectric feedback
• On the Indeterministic Nature of Star Formation on the Cloud Scale
• Stellar mass spectrum within massive collapsing clumps I. Influence of the initial conditions
• How Significant is Radiation Pressure in the Dynamics of the Gas Around Young Stellar Clusters?
• Gas expulsion vs gas retention: what process dominates in young massive clusters?
• Comparing Young Massive Clusters and their Progenitor Clouds in the Milky Way
• Diffuse X-Ray Emission from the Quiescent Superbubble M17, the Omega Nebula
• Relativistic Ionization Fronts
• Can the Lyman Continuum leaked out of H II regions explain Diffuse Ionized Gas?
• Forming clusters within clusters: How 30 Doradus recollapsed and gave birth again
• On the relative importance of different microphysics on the D-type expansion of galactic HII regions
• Gas expulsion vs gas retention in young stellar clusters II: effects of cooling and mass segregation
• Spectral shifting strongly constrains molecular cloud disruption by radiation pressure on dust
• From forced collapse to H ii region expansion in Mon R2: Envelope density structure and age determination with Herschel
• Line Emission from Radiation-Pressurized HII Region II: Dynamics and Population Synthesis
• Molecular Cloud Evolution VI. Measuring cloud ages
• Line Emission from Radiation-Pressurized HII Regions I: Internal Structure and Line Ratios
• J plots: a new method for characterizing structures in the interstellar medium
• Antiferromagnetic spin correlations and pseudogap-like behavior in Ca(Fe1-xCox)2As2 studied by 75As nuclear magnetic resonance and anisotropic resistivity

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• CLASSY IV: Exploring UV diagnostics of the interstellar medium in local high-$z$ analogs at the dawn of the JWST era
• Which feedback mechanisms dominate in the high-pressure environment of the Central Molecular Zone?
• Zooming in on Individual Star Formation: Low- and High-mass Stars
• Evolution of Stellar Feedback in HII Regions
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• Momentum feedback from marginally-resolved HII regions in isolated disc galaxies
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• WARPFIELD-EMP: The Self-Consistent Prediction of Emission Lines from Evolving HII Regions in Dense Molecular Clouds
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• Outflows from Super Star Clusters in the Central Starburst of NGC253
• The role of Galactic HII regions in the formation of filaments. High-resolution submilimeter imaging of RCW 120 with ArTéMiS
• The formation of massive stellar clusters in converging galactic flows with photoionisation
• A Massive Star is Born: How Feedback from Stellar Winds, Radiation Pressure, and Collimated Outflows Limits Accretion onto Massive Stars
• Correlation between the gas-phase metallicity and ionization parameter in extragalactic HII regions
• The SOFIA FEEDBACK Legacy Survey: Dynamics and mass ejection in the bipolar HII region RCW 36
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• Simulating ionization feedback from young massive stars: impact of numerical resolution
• Bottling the Champagne: Dynamics and Radiation Trapping of Wind-Driven Bubbles around Massive Stars
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• Factories of CO-dark gas: molecular clouds with limited star formation efficiencies by FUV feedback
• APEX CO observations towards the photodissociation region of RCW120
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• New Massive Contact Twin Binary in a Radio-quiet HII Region Associated with the M17 Complex
• SOFIA FIFI-LS spectroscopy of DR21 Main: energetics of the spatially-resolved outflow from a high-mass protostar
• Influence of protostellar jets and HII regions on the formation and evolution of stellar clusters