Hydrodynamics of Cometary Compact HII Regions

Abstract

We present numerical radiation-hydrodynamic simulations of cometary HII regions for a number of champagne flow and bowshock models. For the champagne flow models we study smooth density distributions with both steep and shallow gradients. We also consider cases where the ionizing star has a strong stellar wind, and cases in which the star additionally has a proper motion within the ambient density gradient. We present simulated emission-measure maps and long-slit spectra of our results. Our numerical models are not tailored to any particular object but comparison with observations from the literature shows that, in particular, the models combining density gradients and stellar winds are able to account for both the morphology and radial velocity behavior of several observed cometary HII regions, such as the well-studied object G29.96-0.02.

Astrophysical Journal Supplement Series in press. 25 pages in emulate ApJ style. Revised to correspond to accepted paper

References in corpus (15)

• A new calibration of stellar parameters of Galactic O stars
• Nonlinear Instabilities in Shock-Bounded Slabs
• Massive stars and the energy balance of the ISM. I. The impact of an isolated 60 Msun star
• Photoevaporation Flows in Blister HII Regions: I. Smooth Ionization Fronts and Application to the Orion Nebula
• From Dusty Filaments to Cores to Stars: An Infrared Extinction Study of Lupus 3
• Dual Cometary HII Regions in DR21: Bow Shocks or Champagne Flows?
• Morphologies of Ultracompact HII Regions in W49A and Sgr B2: Prevalence of Shells and a Modified Classification Scheme
• Molecular Counterparts of Ultracompact HII Regions with Extended Envelopes
• An IR Study of the Velocity Structure of the Cometary Compact HII region G29.96-0.02
• A VLT spectroscopic study of the ultracompact HII region G29.96-0.02
• Mass Flows in Cometary UCHII Regions
• Kinematics of Ultracompact HII Regions Revealed: High Spectral and Spatial Resolution Mapping of the 12.8 micron [NeII] Line in Monoceros R2
• Molecular and Ionised Gas Motions in the Compact HII region G29.96-0.02
• Decreasing Density Gradients in Circumnuclear HII Regions of Barred Galaxies NGC 1022, 1326 & 4314
• Parsec-scale X-ray Flows in High-mass Star-forming Regions

Cited by in corpus (69)

• The Co-ordinated Radio and Infrared Survey for High Mass Star Formation (The CORNISH Survey) - I. Survey Design
• Radiation-magnetohydrodynamic simulations of HII regions and their associated PDRs in turbulent molecular clouds
• The RMS Survey: Critical Tests of Accretion Models for the Formation of Massive Stars
• Magnetohydronamic Evolution of HII Regions in Molecular Clouds: Simulation Methodology, Tests, and Uniform Media
• Understanding Spatial and Spectral Morphologies of Ultracompact H II Regions
• Dynamical HII Region Evolution in Turbulent Molecular Clouds
• The modelling of feedback in star formation simulations
• Radiation-Hydrodynamic Models of the evolving Circumstellar Medium around Massive Stars
• How Very Massive Metal Free Stars Start Cosmological Reionization
• A MUSE map of the central Orion Nebula (M 42)
• Radiation hydrodynamics of triggered star formation: the effect of the diffuse radiation field
• Wind bubbles within H II regions around slowly moving stars
• Interstellar Weather Vanes: GLIMPSE Mid-Infrared Stellar-Wind Bowshocks in M17 and RCW49
• The three dimensional dynamic structure of the inner Orion Nebula
• Evolution of Stellar Feedback in HII Regions
• Comparing the pre-SNe feedback and environmental pressures for 6000 HII regions across 19 nearby spiral galaxies
• Bow shock nebulae of hot massive stars in a magnetized medium
• Detecting stellar-wind bubbles through infrared arcs in HII regions
• The circumstellar medium around a rapidly rotating, chemically homogeneously evolving, possible gamma-ray burst progenitor
• Synthetic observations of star formation and the interstellar medium
• Structure and Expansion Law of HII Regions in structured Molecular Clouds
• On the X-ray temperature of hot gas in diffuse nebulae
• Thermal emission from bow shocks I: 2D Hydrodynamic Models of the Bubble Nebula
• Dynamical Expansion of H II Regions from Ultracompact to Compact Sizes in Turbulent, Self-Gravitating Molecular Clouds
• Properties of the Compact HII Region Complex G-0.02-0.07
• [Ne II] Observations of Gas Motions in Compact and Ultracompact H II Regions
• Turbulence in the Ionized Gas of the Orion Nebula
• Massive Star Formation of the Sgr A East HII Regions Near the Galactic Center
• Dynamics of H II regions around exiled O stars
• X-ray Observations of Bow Shocks around Runaway O Stars. The case of $\zeta$ Oph and BD+43${}^{\circ }$3654
• Bow shocks, bow waves, and dust waves. I. Strong coupling limit
• Star formation towards the southern Cometary HII region IRAS 17256-3631
• Hot gas in the Wolf-Rayet nebula NGC3199
• Colliding Winds in and around the Stellar Group IRS 13E at the Galactic Center
• Rings and arcs around evolved stars. II. The Carbon Star AFGL 3068 and the Planetary Nebulae NGC 6543, NGC 7009 and NGC 7027
• Hydrodynamical models of cometary HII regions
• New detections of (sub)millimeter hydrogen radio recombination lines towards high-mass star-forming clumps
• Self-Similar Polytropic Champagne Flows in H II Regions
• FOREST Unbiased Galactic Plane Imaging Survey with the Nobeyama 45-m Telescope (FUGIN) IV: Galactic Shock Wave and Molecular Bow Shock in the 4-kpc Arm of the Galaxy
• The cometary HII regions of DR 21: Bow shocks or champagne flows or both?
• Bow shocks, bow waves, and dust waves. III. Diagnostics
• Probing the massive star forming environment - a multiwavelength investigation of the filamentary IRDC G333.73+0.37
• From Ultracompact to Extended HII Regions. II: Cloud Gravity and Stellar Motion
• Mixing of materials in magnetised core-collapse supernova remnants
• A wind-blown bubble in the Central Molecular Zone cloud G0.253+0.016
• Thermal emission from bow shocks II: 3D magnetohydrodynamic models of Zeta Ophiuchi
• Diagnostic line ratios in the IC 1805 optical gas complex
• A Herschel and BIMA study of the sequential star formation near the W48A HII region
• Inverted level populations of hydrogen atoms in ionized gas
• The hydrodynamical models of the cometary compact H II region
• Determining electron temperature and density in a H II region by using the relative strengths of hydrogen radio recombination lines
• Gas Kinematics in the HII regions G351.69-1.15 and G351.63-1.25
• The Dynamics of Ultracompact HII Regions
• Gas kinematics in massive star-forming regions from the Perseus spiral arm
• Galatic HII region IRAS 17149$-$3916 -- A multiwavelength study
• Spatial distributions and kinematics of shocked and ionized gas in M17
• Numerical models for the dust in RCW 120
• A Massive Young Runaway Star in W49 North
• Off-center HII regions in power-law density distributions
• Giant Cometary HII Regions and Molecular Bow Shocks in Spiral Arms of Galaxies: M83
• Molecular gas properties in young stellar clusters with a suppressed star cluster wind
• 3D structure of HII regions in the star-forming complex S254-S258
• SDSS-V LVM: Resolving Physical Conditions in the Trifid Nebula
• GSH 91.5+2-114: A large HI shell in the outer part of the Galaxy
• Adjusting the bow-tie: A morpho-kinematic study of NGC40
• Line Profile studies of Hydrodynamical Models of Cometary Compact H II Regions
• GTC/CanariCam Mid-IR Polarimetry of Magnetic Fields in Star-Forming Region W51 IRS2
• Stellar feedback and triggered star formation in the prototypical bubble RCW 120
• An nl-model with a full radiative transfer treatment for level populations of hydrogen atoms in a spherically symmetric H II region