The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts

Abstract

A supersonic relative velocity between dark matter (DM) and baryons (the stream velocity) at the time of recombination induces the formation of low mass objects with anomalous properties in the early Universe. We widen the scope of the `Supersonic Project' paper series to include objects we term Dark Matter + Gas Halos Offset by Streaming (DM GHOSts)--diffuse, DM-enriched structures formed because of a physical offset between the centers of mass of DM and baryonic overdensities. We present an updated numerical investigation of DM GHOSts and Supersonically Induced Gas Objects (SIGOs), including the effects of molecular cooling, in high resolution hydrodynamic simulations using the AREPO code. Supplemented by an analytical understanding of their ellipsoidal gravitational potentials, we study the population-level properties of these objects, characterizing their morphology, spin, radial mass, and velocity distributions in comparison to classical structures in non-streaming regions. The stream velocity causes deviations from sphericity in both the gas and DM components and lends greater rotational support to the gas. Low mass ($<\sim 10^{5.5}$ M${}_{\odot }$) objects in regions of streaming demonstrate core-like rotation and mass profiles. Anomalies in the rotation and morphology of DM GHOSts could represent an early Universe analogue to observed ultra-faint dwarf galaxies with variations in DM content and unusual rotation curves.

arXiv comment27 pages, 20 figures. Accepted ApJ

References in corpus (86)

• A Universal Density Profile from Hierarchical Clustering
• The Structure of Cold Dark Matter Halos
• The cosmological simulation code GADGET-2
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• A Line of Sight Approach to Cosmic Microwave Background Anisotropies
• The observed properties of dwarf galaxies in and around the Local Group
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Physical Models of Galaxy Formation in a Cosmological Framework
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• Properties of galaxies reproduced by a hydrodynamic simulation
• From dwarf spheroidals to cDs: Simulating the galaxy population in a LCDM cosmology
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• Challenges for $\Lambda$CDM: An update
• Reionization and the abundance of galactic satellites
• Observational and Theoretical Constraints on Singular Dark Matter Halos
• The Connection between Galaxies and their Dark Matter Halos
• The Cores of Dwarf Galaxy Halos
• The Faintest Dwarf Galaxies
• The unexpected diversity of dwarf galaxy rotation curves
• Relative velocity of dark matter and baryonic fluids and the formation of the first structures
• Galacticus: A Semi-Analytic Model of Galaxy Formation
• Grackle: a Chemistry and Cooling Library for Astrophysics
• Hierarchical galaxy formation and substructure in the Galaxy's stellar halo
• Four phases of angular-momentum buildup in high-z galaxies: from cosmic-web streams through an extended ring to disc and bulge
• The Origin of Disks and Spheroids in Simulated Galaxies
• Cluster Lenses
• Connecting Angular Momentum and Galactic Dynamics: The complex Interplay between Spin, Mass, and Morphology
• The role of mergers and halo spin in shaping galaxy morphology
• Gas kinematics, morphology, and angular momentum in the FIRE simulations
• Impact of the Relative Motion between the Dark Matter and Baryons on the First Stars
• The signature of the first stars in atomic hydrogen at redshift 20
• The Delay of Population III Star Formation by Supersonic Streaming Velocities
• The angular momentum distribution and baryon content of star forming galaxies at z~1-3
• Non-circular motions and the diversity of dwarf galaxy rotation curves
• Effect of Streaming Motion of Baryons Relative to Dark Matter on the Formation of the First Stars
• Suppression and Spatial Variation of Early Galaxies and Minihalos
• Is the dark-matter halo spin a predictor of galaxy spin and size?
• Supersonic Gas Streams Enhance the Formation of Massive Black Holes in the Early Universe
• Towards a Resolution of the Galactic Spin Crisis: Mergers, Feedback, and Spin Segregation
• Angular momentum properties of haloes and their baryon content in the Illustris simulation
• Growth of Linear Perturbations before the Era of the First Galaxies
• Simulations of Early Baryonic Structure Formation with Stream Velocity: II. The Gas Fraction
• The impact of the supersonic baryon-dark matter velocity difference on the z~20 21cm background
• The no-spin zone: rotation vs dispersion support in observed and simulated dwarf galaxies
• The formation of direct collapse black holes under the influence of streaming velocities
• A Catalog of Edge-on Disk Galaxies: From Galaxies with a Bulge to Superthin Galaxies
• Simulations of Early Baryonic Structure Formation with Stream Velocity: I. Halo Abundance
• The formation of the first cosmic structures and the physics of the z~20 Universe
• The formation of massive black holes in z~30 dark matter haloes with large baryonic streaming velocities
• The formation and gas content of high redshift galaxies and minihalos
• Generation of Primordial Magnetic Fields on Linear Over-density Scales
• Robust Velocity-induced Acoustic Oscillations at Cosmic Dawn
• Seeding the Second Star: enrichment from population III, dust evolution, and cloud collapse
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Inner cusps of the first dark matter haloes: Formation and survival in a cosmological context
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
• Galactic angular momentum in the IllustrisTNG simulation -- I. Connection to morphology, halo spin, and black hole mass
• Impact of baryonic streaming velocities on the formation of supermassive black holes via direct collapse
• Gas in Simulations of High Redshift Galaxies and Minihalos
• Low-mass suppression of the satellite luminosity function due to the supersonic baryon--cold-dark-matter relative velocity
• The effect of baryonic streaming motions on the formation of the first supermassive black holes
• The Supersonic Project: Shining Light on SIGOs - a New Formation Channel for Globular Clusters
• Gas rich and gas poor structures through the stream velocity effect
• Hybrid Cosmological Simulations with Stream Velocities
• Still at Odds with Conventional Galaxy Evolution: The Star Formation History of Ultra-Diffuse Galaxy Dragonfly 44
• The galaxy size to halo spin relation of disk galaxies in cosmological hydrodynamical simulations
• The galaxy-halo size relation of low-mass galaxies in FIRE
• The Supersonic Project: rotational effects of supersonic motions on the first structures in the Universe
• Large-scale variation in reionization history caused by Baryon-dark matter streaming velocity
• First Structure Formation under the Influence of Gas-Dark Matter Streaming Velocity and Density: Impact of the Baryons-trace-dark matter Approximation
• Globular Clusters and Streaming Velocities: Testing the new formation channel in high-resolution cosmological simulations
• First estimate of the local value of the baryonic streaming velocity
• Stellar angular momentum can be controlled from cosmological initial conditions
• A Model-Insensitive Baryon Acoustic Oscillation Feature in the 21 cm Signal from Reionization
• The nonlinear evolution of baryonic overdensities in the early universe: Initial conditions of numerical simulations
• Effect of supersonic relative motion between baryons and dark matter on collapsed objects
• ${\mathrm{H}}_2$ cooling and gravitational collapse of supersonically induced gas objects
• The Supersonic Project: To cool or not to cool Supersonically Induced Gas Objects (SIGOs)?
• Uncovering dark matter density profiles in dwarf galaxies with graph neural networks
• HI angular momentum mass relation
• The Supersonic Project: The Early Evolutionary Path of SIGOs
• Gravitational lensing effects of supermassive black holes in cluster environments
• Spin Alignment of Dark Matter Halos: Mad Halos
• Reorientation Rates of Structural and Kinematic Axes in Simulated Massive Galaxies and the Origins of Prolate Rotation

Cited by in corpus (1)

• A self-consistent semi-analytic model for Population III star formation in minihalos