Demographics and Physical Properties of Gas Out/Inflows at 0.4 < z < 1.4

Abstract

We present Keck/LRIS spectra of over 200 galaxies with well-determined redshifts between 0.4 and 1.4. We combine new measurements of near-ultraviolet, low-ionization absorption lines with previously measured masses, luminosities, colors, and star formation rates to describe the demographics and properties of galactic flows. Among star-forming galaxies with blue colors, we find a net blueshift of the FeII absorption greater than 200 km/s (100 km/s) towards 2.5% (20%) of the galaxies. The fraction of blueshifted spectra does not vary significantly with stellar mass, color, or luminosity but does decline at specific star formation rates less than roughly 0.8 Gyr^{-1}. The insensitivity of the blueshifted fraction to galaxy properties requires collimated outflows at these redshifts, while the decline in outflow fraction with increasing blueshift might reflect the angular dependence of the outflow velocity. The low detection rate of infalling gas, 3 to 6% of the spectra, suggests an origin in (enriched) streams favorably aligned with our sightline. We find 4 of these 9 infalling streams have projected velocities commensurate with the kinematics of an extended disk or satellite galaxy. The strength of the MgII absorption increases with stellar mass, B-band luminosity, and U-B color, trends arising from a combination of more interstellar absorption at the systemic velocity and less emission filling in more massive galaxies. Our results provides a new quantitative understanding of gas flows between galaxies and the circumgalactic medium over a critical period in galaxy evolution.

arXiv commentAccepted version in 2-column format with embedded figures

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• Using Artificial Neural Networks to Constrain the Halo Baryon Fraction during Reionization
• Disentangling the multi-phase circumgalactic medium shared between a dwarf and a massive star-forming galaxy at z~0.4
• MUSE-ALMA Halos XI: Gas flows in the circumgalactic medium
• Inflow of low-metallicity cool gas in the halo of the Andromeda galaxy
• The CGM-GRB Study. I. Uncovering The CircumGalactic Medium around GRB hosts at redshifts 2-6
• Gas Accretion and Star Formation Rates
• The relationship between gas and galaxies at z<1 using the Q0107 quasar triplet
• Rest-frame ultra-violet spectra of massive galaxies at z=3: evidence of high-velocity outflows
• Interpreting the cosmic far-infrared background anisotropies using a gas regulator model
• A Semi-Analytical Line Transfer (SALT) Model III: Galactic Inflows
• No evidence for feedback: Unexceptional Low-ionization winds in Host galaxies of Low Luminosity Active Galactic Nuclei at Redshift z ~1
• The Strong Gravitationally Lensed Herschel Galaxy HLock01: Optical Spectroscopy Reveals a Close Galaxy Merger with Evidence of Inflowing Gas
• Metal content of the circumgalactic medium around star-forming galaxies at z $\sim$ 2.6 as revealed by the VIMOS Ultra-Deep Survey
• MOSFIRE and LDSS3 Spectroscopy for an [OII] Blob at z=1.18: Gas Outflow and Energy Source
• Feedback and dynamical masses in high-$z$ galaxies: the advent of high-resolution NIRSpec spectroscopy
• Nature of the Galaxies On Top Of Quasars producing MgII absorption
• Gas Accretion Traced in Absorption in Galaxy Spectroscopy
• Gas Accretion via Lyman Limit Systems
• Interpreting the Si II and C II line spectra from the COS Legacy Spectroscopic SurveY using a virtual galaxy from a high-resolution radiation-hydrodynamic simulation
• The MOSDEF-LRIS Survey: Detection of Inflowing Gas Towards Three Star-forming Galaxies at z ~ 2
• On the Cosmic Evolution of Fe/Mg in QSO Absorption Line Systems
• The metallicity evolution of blue compact dwarf galaxies from the intermediate redshift to the local Universe
• A VLT/FORS2 Narrowband Imaging Search for MgII Emission Around z ~ 0.7 Galaxies
• Testing SALT Approximations with Numerical Radiation Transfer Code Part 1: Validity and Applicability
• The Baltimore Oriole's Nest: Cool Winds from the Inner and Outer Parts of a Star-Forming Galaxy at z=1.3
• A galactic outflow traced by its extended Mg II emission out to a $\sim 30$ kpc radius in the Hubble Ultra Deep Field with MUSE
• Resolved galactic superwinds reconstructed around their host galaxies at z>3
• Measuring the physical imprints of gas flows in galaxies I: Accretion rate histories
• The SAMI Galaxy Survey: understanding observations of large-scale outflows at low redshift with EAGLE simulations
• MusE GAs FLOw and Wind (MEGAFLOW) XI. Scaling relations between outflows and host galaxy properties
• Multiple MgII Absorption Systems in the Lines of Sight to Quadruply Lensed Quasar H1413+1143
• Stability and Ly$\alpha$ emission of Cold Stream in the Circumgalactic Medium: impact of magnetic fields and thermal conduction
• A Giant Green Pea Identified in the Spectroscopy of Spatially Extended [OIII] Sources
• Probing the circumgalactic medium of active galactic nuclei with background quasars
• Physical Origins of Outflowing Cold Clouds in Local Star-forming Dwarf Galaxies
• Observational Diagnostics of Gas Flows: Insights from Cosmological Simulations
• The Circumgalactic H$\alpha$ Spectrograph (CH$\alpha$S) I. Design, Engineering, and Early Commissioning
• A public grid of radiative transfer simulations for Lyman-alpha and metal lines in idealised galactic outflows
• A young galaxy cluster in the old Universe
• A High Signal-to-Noise HST Spectrum Toward J1009+0713: Precise Absorption Measurements in the CGM of Two Galaxies
• The Cosmic Evolution of Gamma-Ray Burst Host Galaxies
• On the theory of mass loss in dwarf galaxies: I - basic equations and the case of wave/thermal driven winds
• A Simulated Galaxy Laboratory: Exploring the Observational Effects on UV Spectral Absorption Line Measurements
• Fluorescent C II* 1335A emission spectroscopically resolved in a galaxy at z = 5.754
• Ultra-strong MgII absorbers trace both inflowing and outflowing gas: insights from dual down-the-barrel and quasar sightlines
• Revisiting the Galactic Winds in M82 II: Development of Multiphase Outflows in Simulations
• A high-redshift quasar absorber without CIV - a galactic outflow caught in the act?
• The Discovery and Origin of A Very-High Velocity Cloud Toward M33
• Magnetising galaxies with cold inflows
• The large-scale distribution of ionized metals in IllustrisTNG
• The AURORA Survey: Tracing Galactic Outflows at $z\gtrsim 2.5$ with JWST/NIRSpec NUV Absorption Lines
• Hamilton's Object Revisited: A challenging source redshift of a strong lensing configuration
• The Lockman-SpReSO project. Galactic flows in a sample of far-infrared galaxies
• The MUSE Ultra Deep Field (MUDF) VIII. The cool gas distribution surrounding galaxies at redshifts z ~ 0.5-2
• A z$\sim$1 galactic-scale outflow transversally mapped to $\sim$50 kpc through gravitational-arc tomography