Properties of the interstellar medium in star-forming galaxies at redshifts 2 < z < 5 from the VANDELS survey

Abstract

Gaseous flows inside and outside galaxies are key to understanding galaxy evolution, as they regulate their star formation activity across cosmic time. We study the ISM kinematics of 330 CIII or HeII emitters, using far-UV ISM absorption lines detected in the VANDELS spectra. These galaxies span a broad range of stellar masses M${}_{\ast }$ from $10^8$ to $10^{11}$ M${}_{\odot }$, and SFRs from 1 to 500 M${}_{\odot }$/yr, in the redshift range between 2 and 5. We find that the bulk ISM velocity v${}_{ism}$ is globally in outflow, with v${}_{ism}$ of -60 $\pm$ 10 km/s for low ionization gas traced by SiII 1260 Angstrom, CII 1334, SiII 1526, and AlII 1670, and v${}_{ism}$ of -160 $\pm$ 30 and -170 $\pm$ 30 km/s for higher ionization gas traced respectively by AlIII 1854-1862 and SiIV 1393-1402. Interestingly, BPASS models are able to better reproduce the stellar continuum around the SiIV doublet than other stellar population templates. For individual galaxies, $34\%$ of the sample has a positive ISM velocity shift, almost double the fraction reported at lower redshifts. Comparing v${}_{ism}$ to the host galaxies properties, we find no significant correlations with M${}_{\ast }$ or SFR, and only a marginally significant dependence (at $\sim 2\sigma$) on morphology-related parameters, with slightly higher velocities in galaxies of smaller size (probed by the equivalent radius), higher concentration, and higher SFR surface density. The outflows are consistent with models of accelerating, momentum-driven winds, with densities decreasing towards the outskirts. Our moderately lower ISM velocities compared to those found in similar studies at lower redshifts suggest that inflows and internal turbulence might play an increased role at $z>2$. We estimate mass outflow rates comparable to the SFRs of the galaxies, and an average escape velocity of 625 km/s, suggesting that most of the ISM will remain bound to the galaxy halo.

24 pages, 2 tables and 20 figures, accepted for publication in A&A. This replaces the submitted version posted before. Fig. A.2 replaced, Fig. A.1 updated, typos corrected. Language editing by A&A has been performed

References in corpus (25)

• Cold streams in early massive hot haloes as the main mode of galaxy formation
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since $z=3$
• Binary Population and Spectral Synthesis Version 2.1: construction, observational verification and new results
• Ubiquitous outflows in DEEP2 spectra of star-forming galaxies at z=1.4
• The Chandra Deep Field-South Survey: 7 Ms Source Catalogs
• Star formation efficiency in galaxy interactions and mergers: a statistical study
• Modelling the nebular emission from primeval to present-day star-forming galaxies
• The Current Status of Galaxy Formation
• Quasar Quartet Embedded in Giant Nebula Reveals Rare Massive Structure in Distant Universe
• Radio imaging of the Subaru/XMM-Newton Deep Field - I. The 100-microJy catalogue, optical identifications, and the nature of the faint radio source population
• The Physical Nature of Rest-UV Galaxy Morphology During the Peak Epoch of Galaxy Formation
• MusE GAs FLOw and Wind (MEGAFLOW) II. A study of gas accretion around $z\approx 1$ star-forming galaxies with background quasars
• Far-infrared and dust properties of present-day galaxies in the EAGLE simulations
• The VANDELS survey: the stellar metallicities of star-forming galaxies at 2.5 < z < 5.0
• The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
• Three Lyman-alpha emitting filaments converging to a massive galaxy group at z=2.91: discussing the case for cold gas infall
• The NIRVANDELS Survey: a robust detection of $\alpha$-enhancement in star-forming galaxies at $z\simeq 3.4$
• The Advanced Camera for Surveys General Catalog: Structural Parameters for Approximately Half a Million Galaxies
• Being KLEVER at cosmic noon: ionised gas outflows are inconspicuous in low-mass star-forming galaxies but prominent in massive AGN hosts
• The VANDELS survey: the relation between UV continuum slope and stellar metallicity in star-forming galaxies at z~3
• Outflows in Star-forming Galaxies: Stacking Analyses of Resolved Winds and the Relation to Their Hosts' Properties
• The Strength of the 2175Å Feature in the Attenuation Curves of Galaxies at 0.1<z<3
• The evolution of the mass-metallicity relations from the VANDELS survey and the GAEA Semi-Analytic model
• Deciphering an evolutionary sequence of merger stages in infrared-luminous starburst galaxies at z ~ 0.7

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• The MOSDEF-LRIS Survey: Detection of Inflowing Gas Towards Three Star-forming Galaxies at z ~ 2
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