First estimate of the local value of the baryonic streaming velocity

Abstract

Several studies have shown the influence of the relative streaming velocity (SV) between baryons and dark matter on the formation of structures. For the first time, we constrain the local value of the SV in which the Milky Way was formed. We use the semi-analytical model A-SLOTH to simulate the formation of Milky Way-like galaxies. The high resolution in mass and time of the dark matter merger trees from the Caterpillar simulation enables to accurately model star formation in the smallest progenitor halos at high redshift. The efficient semi-analytical nature of A-SLOTH allows us to run many simulations with various values of the local SV. Our investigation on the influence of the SV shows that it delays star formation at high redshift. However, at redshift z=0, the SV has no effect on the total stellar mass in the Milky Way nor its Satellites. We find that extremely metal-poor and ultra metal-poor stars are affected by the SV, and can hence be used to constrain its local value. The local optimal value of the SV is $v_{\mathrm{SV}}=1.75_{-0.28}^{+0.13}{\sigma }_{\mathrm{SV}}$, which is based on four independent observables. We further find that the SV decreases the number of luminous Milky Way satellites, but this decrease is not enough to solve the missing satellite problem.

arXiv commentPublished by MNRAS

References in corpus (47)

• The observed properties of dwarf galaxies in and around the Local Group
• The Rockstar Phase-Space Temporal Halo Finder and the Velocity Offsets of Cluster Cores
• In the Beginning: The First Sources of Light and the Reionization of the Universe
• The mass distribution and gravitational potential of the Milky Way
• Tracing Galaxy Formation with Stellar Halos I: Methods
• The Kinematics of the Ultra-Faint Milky Way Satellites: Solving the Missing Satellite Problem
• Gravitationally Consistent Halo Catalogs and Merger Trees for Precision Cosmology
• Relative velocity of dark matter and baryonic fluids and the formation of the first structures
• The accretion origin of the Milky Way's stellar halo
• A MegaCam Survey of Outer Halo Satellites. III. Photometric and Structural Parameters
• Two populations of metal-free stars in the early Universe
• The Formation Rates of Population III Stars and Chemical Enrichment of Halos during the Reionization Era
• The Delay of Population III Star Formation by Supersonic Streaming Velocities
• Effect of Streaming Motion of Baryons Relative to Dark Matter on the Formation of the First Stars
• The Inhomogeneous Background of H2 Dissociating Radiation During Cosmic Reionization
• The Inhomogeneous Background of Hydrogen-Molecule Dissociating Radiation during Cosmic Reionization
• Supersonic Gas Streams Enhance the Formation of Massive Black Holes in the Early Universe
• The Caterpillar Project: A Large Suite of Milky Way Sized Halos
• Simulations of Early Baryonic Structure Formation with Stream Velocity: II. The Gas Fraction
• The impact of primordial supersonic flows on early structure formation, reionization and the lowest-mass dwarf galaxies
• The formation of direct collapse black holes under the influence of streaming velocities
• The Influence of Streaming Velocities on the Formation of the First Stars
• The Source Density and Observability of Pair-Instability Supernovae from the First Stars
• The influence of streaming velocities and Lyman-Werner radiation on the formation of the first stars
• The formation of the first cosmic structures and the physics of the z~20 Universe
• The critical dark matter halo mass for Population III star formation: dependence on Lyman-Werner radiation, baryon-dark matter streaming velocity, and redshift
• The Pristine survey VIII: The metallicity distribution function of the Milky Way halo down to the extremely metal-poor regime
• The First Stars
• Public Release of A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
• Classification of extremely metal-poor stars: absent region in A(C)-[Fe/H] plane and the role of dust cooling
• Globular Clusters and Dark Satellite Galaxies through the Stream Velocity
• Supersonic Relative Velocity between Dark Matter and Baryons: A Review
• Impact of baryonic streaming velocities on the formation of supermassive black holes via direct collapse
• 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
• Implications of inhomogeneous metal mixing for stellar archaeology
• Hybrid Cosmological Simulations with Stream Velocities
• The Metal-Poor Metallicity Distribution of the Ancient Milky Way
• 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
• A-SLOTH: Ancient Stars and Local Observables by Tracing Halos
• ${\mathrm{H}}_2$ cooling and gravitational collapse of supersonically induced gas objects
• The Supersonic Project: To cool or not to cool Supersonically Induced Gas Objects (SIGOs)?
• Effect of supersonic relative motion between baryons and dark matter on collapsed objects
• Formation of First Galaxies inside Density Peaks and Voids under the Influence of Dark Matter-Baryon Streaming Velocity, I: Initial Condition and Simulation Scheme
• Shape and Spin of Minihaloes. II: The Effect of Streaming Velocities
• Where are the extremely metal-poor stars in the Milky Way and Andromeda? Expectations from TNG50

Cited by in corpus (7)

• Binary black hole mergers from Population III stars: uncertainties from star formation and binary star properties
• Starbursts in low-mass haloes at Cosmic Dawn. I. The critical halo mass for star formation
• A-SLOTH reveals the nature of the first stars
• Gravitational waves from mergers of Population III binary black holes: roles played by two evolution channels
• The Impact of Molecular Hydrogen Cooling on the Galaxy Formation Threshold
• The Supersonic Project: The eccentricity and rotational support of SIGOs and DM GHOSts
• Impact of Population III stars on the astrophysical gravitational-wave background