Stellar and Gaseous Disk Structures in Cosmological Galaxy Equilibrium Models

Abstract

We present "radially-resolved-equilibrium-models" for the growth of stellar and gaseous disks in cosmologically accreting massive halos. Our focus is on objects that evolve to redshifts $z\sim 2$. We solve the time-dependent equations that govern the radially dependent star-formation rates, inflows and outflows from and to the inter- and circum-galactic medium, and inward radial gas flows within the disks. The stellar and gaseous disks reach equilibrium configurations on dynamical time scales much shorter than variations in the cosmological dark matter halo growth and baryonic accretions rates. We show analytically that mass and global angular momentum conservation naturally give rise to exponential gas and stellar disks over many radial length scales. As expected, the gaseous disks are more extended as set by the condition Toomre $Q<1$ for star-formation. The disks rapidly become baryon dominated. For massive, $5\times 10^{12}{M}_{\odot }$ halos at redshift $z=2$, we reproduced the typical observed star-formation rates of $\sim 100M_{\odot }{\mathrm{yr}}^{-1}$, stellar masses $\sim 9\times 10^{10}{M}_{\odot }$, gas contents $\sim 10^{11}{M}_{\odot }$, half mass sizes of 4.5 and 5.8 kpc for the stars and gas, and characteristic surface densities of $500$ and $400M_{\odot }{\mathrm{pc}}^{-2}$ for the stars and gas.

arXiv comment13 pages, 28 figures, to appear in MNRAS

References in corpus (41)

• The Structure of Cold Dark Matter Halos
• The physical properties of star forming galaxies in the low redshift universe
• The Formation of Galactic Disks
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• The Star Formation Efficiency in Nearby Galaxies: Measuring Where Gas Forms Stars Effectively
• Cold streams in early massive hot haloes as the main mode of galaxy formation
• The reversal of the star formation-density relation in the distant universe
• Multiwavelength study of massive galaxies at z~2. I. Star formation and galaxy growth
• The SINS survey: SINFONI Integral Field Spectroscopy of z ~ 2 Star-forming Galaxies
• At the heart of the matter: the origin of bulgeless dwarf galaxies and Dark Matter cores
• Nonlinear Outcome of Gravitational Instability in Cooling, Gaseous Disks
• PHIBSS: molecular gas content and scaling relations in z~1-3 normal star forming galaxies
• A universal angular momentum profile for galactic halos
• Gas-regulation of galaxies: the evolution of the cosmic sSFR, the metallicity-mass-SFR relation and the stellar content of haloes
• Halo concentrations in the standard LCDM cosmology
• Combined CO & Dust Scaling Relations of Depletion Time and Molecular Gas Fractions with Cosmic Time, Specific Star Formation Rate and Stellar Mass
• Star formation thresholds and galaxy edges: why and where
• The Impact of cold gas accretion above a mass floor on galaxy scaling relations
• The KMOS^3D Survey: design, first results, and the evolution of galaxy kinematics from 0.7<z<2.7
• The Formation of Disk Galaxies
• An Analytic Model for the Evolution of the Stellar, Gas, and Metal Content of Galaxies
• The galaxy stellar mass-star formation rate relation: Evidence for an evolving stellar initial mass function?
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• High-redshift clumpy discs and bulges in cosmological simulations
• Galaxy Disks
• The Stellar Mass Density and Specific Star Formation Rate of the Universe at z~7
• Hierarchical formation of bulgeless galaxies: Why outflows have low angular momentum
• Short-lived star-forming giant clumps in cosmological simulations of z~2 disks
• An analytic solution for the minimal bathtub toy model: challenges in the star-formation history of high-z galaxies
• The angular momentum distribution and baryon content of star forming galaxies at z~1-3
• High-Redshift Star-Forming Galaxies: Angular Momentum and Baryon Fraction, Turbulent Pressure Effects and the Origin of Turbulence
• Large scale galactic turbulence: can self-gravity drive the observed HI velocity dispersions?
• Towards a Resolution of the Galactic Spin Crisis: Mergers, Feedback, and Spin Segregation
• On the Origin of Exponential Galaxy Disks
• Evolution of violent gravitational disc instability in galaxies: Late stabilization by transition from gas to stellar dominance
• The Evolution of Stellar Exponential Discs
• On the Evolution of the Velocity-Mass-Size Relations of Disk-Dominated Galaxies over the Past 10 Billion Years
• What are little worlds made of? Stellar abundances and the building blocks of planets
• On column density thresholds and the star formation rate
• Measuring the Spin of Spiral Galaxies
• HI Power Spectra and the Turbulent ISM of Dwarf Irregular Galaxies

Cited by in corpus (15)

• PHIBSS: Unified Scaling Relations of Gas Depletion Time and Molecular Gas Fractions
• The Evolution of the Star-forming Interstellar Medium across Cosmic Time
• The Evolution and Origin of Ionized Gas Velocity Dispersion from $z\sim 2.6$ to $z\sim 0.6$ with KMOS${}^{3D}$
• The Evolution of the Baryons Associated with Galaxies Averaged over Cosmic Time and Space
• The ALMA Spectroscopic Survey in the HUDF: The Cosmic Dust and Gas Mass Densities in Galaxies up to $z\sim 3$
• ALMA measures rapidly depleted molecular gas reservoirs in massive quiescent galaxies at z~1.5
• A${}^3$COSMOS: A census on the molecular gas mass and extent of main-sequence galaxies across cosmic time
• The physical drivers of gas turbulence in simulated disc galaxies
• CEERS: MIRI deciphers the spatial distribution of dust-obscured star formation in galaxies at $0.1<z<2.5$
• Exponential Disks from Stellar Scattering: III. Stochastic Models
• Exponential profiles from stellar scattering off interstellar clumps and holes in dwarf galaxy discs
• Gas Accretion and Galactic Chemical Evolution: Theory and Observations
• A${}^3$COSMOS: Measuring the cosmic dust-attenuated star formation rate density at $4<z<5$
• Cold Exponential Disks From Interstellar Fountains
• Unveiling an old disk around a massive young leaking blueberry in SDSS-IV MaNGA