Models of rotating coronae

Abstract

Fitting equilibrium dynamical models to observational data is an essential step in understanding the structure of the gaseous hot haloes that surround our own and other galaxies. However, the two main categories of models that are used in the literature are poorly suited for this task: (i) simple barotropic models are analytic and can therefore be adjusted to match the observations, but are clearly unrealistic because the rotational velocity $v_{\varphi }(R,z)$ does not depend on the distance $z$ from the galactic plane, while (ii) models obtained as a result of cosmological galaxy formation simulations are more realistic, but are impractical to fit to observations due to high computational cost. Here we bridge this gap by presenting a general method to construct axisymmetric baroclinic equilibrium models of rotating galactic coronae in arbitrary external potentials. We consider in particular a family of models whose equipressure surfaces in the $(R,z)$ plane are ellipses of varying axis ratio. These models are defined by two one-dimensional functions, the axial ratio of pressure $q_{\mathrm{axis}}(z)$ and the value of the pressure $P_{\mathrm{axis}}(z)$ along the galaxy's symmetry axis. These models can have a rotation speed $v_{\varphi }(R,z)$ that realistically decreases as one moves away from the galactic plane, and can reproduce the angular momentum distribution found in cosmological simulations. The models are computationally cheap to construct and can thus be used in fitting algorithms. We provide a python code that given $q_{\mathrm{axis}}(z)$, $P_{\mathrm{axis}}(z)$ and $\Phi (R,z)$ returns $\rho (R,z)$, $T(R,z)$, $P(R,z)$, $v_{\varphi }(R,z)$. We show a few examples of these models using the Milky Way as a case study.

arXiv commentAccepted for publication in MNRAS

References in corpus (70)

• The Structure of Cold Dark Matter Halos
• The ATNF Pulsar Catalogue
• The Galaxy in Context: Structural, Kinematic and Integrated Properties
• The ATNF Pulsar Catalogue
• The mass distribution and gravitational potential of the Milky Way
• Giant Gamma-ray Bubbles from Fermi-LAT: AGN Activity or Bipolar Galactic Wind?
• Big Bang Nucleosynthesis: 2015
• A universal angular momentum profile for galactic halos
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• Gaseous Galaxy Halos
• Highly-Ionized High-Velocity Gas in the Vicinity of the Galaxy
• HI in Local Group Dwarf Galaxies and Stripping by the Galactic Halo
• The Hubble Constant
• The Vertical Structure of Warm Ionised Gas in the Milky Way
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• The Large-scale Bipolar Wind in the Galactic Center
• A huge reservoir of ionized gas around the Milky Way: Accounting for the Missing Mass?
• Connecting Angular Momentum and Galactic Dynamics: The complex Interplay between Spin, Mass, and Morphology
• The Angular Momentum of Gas in Proto-Galaxies I. Implications for the Formation of Disk Galaxies
• Constraining the Milky Way's Hot Gas Halo with OVII and OVII Emission Lines
• The Structure of the Milky Way's Hot Gas Halo
• The circumgalactic medium of massive galaxies at z~3: a test for stellar feedback, galactic outflows, and cold streams
• Multi-phase High-Velocity Clouds toward HE 0226-4110 and PG 0953+414
• The Magellanic Stream: Circumnavigating the Galaxy
• Energy Spectra of the Soft X-ray Diffuse Emission in Fourteen Fields Observed with Suzaku
• Detection of a Hot Gaseous Halo Around the Giant Spiral Galaxy NGC 1961
• Properties of gas in and around galaxy haloes
• Cosmological Galaxy Formation Simulations Using SPH
• Gas Rich Dwarf Spheroidals
• X-ray coronae in simulations of disc galaxy formation
• Ram Pressure Stripping of the Large Magellanic Cloud's Disk as a Probe of the Milky Way's Circumgalactic Medium
• MAGICC haloes: confronting simulations with observations of the circumgalactic medium at z=0
• X-Ray Absorption from the Milky Way Halo and the Local Group
• The alignment and shape of dark matter, stellar, and hot gas distributions in the EAGLE and cosmo-OWLS simulations
• Unveiling the corona of the Milky Way via ram-pressure stripping of dwarf satellites
• Supernova-driven gas accretion in the Milky Way
• MaGICC Thick Disk I: Comparing a Simulated Disk Formed with Stellar Feedback to the Milky Way
• Hot X-ray coronae around massive spiral galaxies: a unique probe of structure formation models
• Do high-velocity clouds form by thermal instability?
• Galactic fountains and the rotation of disc-galaxy coronae
• Hydrogen and Metal Line Absorption Around Low-Redshift Galaxies in Cosmological Hydrodynamic Simulations
• Suzaku observations of the diffuse x-ray emission across the fermi bubbles' edges
• On the Hot Gas Content of the Milky Way Halo
• A Deep XMM-Newton Study of the Hot Gaseous Halo Around NGC 1961
• The Angular Momentum Distribution of Gas and Dark Matter in Galactic Halos
• The Structure of the Local Hot Bubble
• The Rotation of the Hot Gas Around the Milky Way
• The Interaction of the Fermi Bubbles with the Milky Way's Hot Gas Halo
• Deviations from hydrostatic equilibrium in the circumgalactic medium: spinning hot haloes and accelerating flows
• Hot Gaseous Coronae around Spiral Galaxies: Probing the Illustris Simulation
• Accretion, radial flows and abundance gradients in spiral galaxies
• Gas Loss by Ram Pressure Stripping and Internal Feedback From Low Mass Milky Way Satellites
• The small-scale structure of the Magellanic Stream
• Gas depletion in Local Group dwarfs on ~250 kpc scales: Ram pressure stripping assisted by internal heating at early times
• A Method for Deriving Accurate Gas-Phase Abundances for the Multiphase Interstellar Galactic Halo
• The formation of hot gaseous haloes around galaxies
• Modelling the HI halo of the Milky Way
• The impact of stellar feedback on hot gas in galaxy haloes: the Sunyaev-Zel'dovich effect and soft X-ray emission
• Head-Tail Clouds: Drops to Probe the Diffuse Galactic Halo
• The Sagittarius dwarf galaxy: Where did all the gas go?
• On the origin of the angular momentum properties of gas and dark matter in galactic halos and its implications
• The Properties of the Galactic Hot Gaseous Halo from X-ray Emission
• The Mass and Absorption Columns of Galactic Gaseous Halos
• Physical Properties of Complex C Halo Clouds
• The angular momentum of cosmological coronae and the inside-out growth of spiral galaxies
• The Magellanic Stream: break up and accretion onto the hot Galactic corona
• The dark haloes of early-type galaxies in low-density environments: XMM-Newton and Chandra observations of NGC 57, NGC 7796 and IC 1531
• The Magellanic Stream and Debris Clouds
• Thermal instability in rotating galactic coronae
• A deep Chandra observation of the hot gaseous halo around a rare, extremely massive and relativistic jet launching spiral galaxy

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• HALOGAS: the properties of extraplanar HI in disc galaxies
• The Angular Momentum of the Circumgalactic Medium in the TNG100 Simulation
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• Most of the cool CGM of star-forming galaxies is not produced by supernova feedback
• The effect of rotation on the thermal instability of stratified galactic atmospheres - I. Local analysis
• The effect of rotation on the thermal instability of stratified galactic atmospheres - II. The formation of High Velocity Clouds
• The role of the halo magnetic field on accretion through High-Velocity Clouds
• Probing gaseous galactic halos through the rotational kSZ effect
• Inflow of low-metallicity cool gas in the halo of the Andromeda galaxy
• Probing the Halo Gas Distribution in the Inner Galaxy with Fermi Bubble Observations
• Introducing the Descriptive Parametric Model: Gaseous Profiles for Galaxies, Groups, and Clusters
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