VALES VIII: Weak ionized gas outflows in star-forming galaxies at $z\sim 0.15$ traced with VLT/MUSE

Abstract

We characterize the ionized gas outflows in 15 low-redshift star-forming galaxies, a Valparaíso ALMA Line Emission Survey (VALES) subsample, using MUSE integral field spectroscopy and GAMA photometric broadband data. We measure the emission-line spectra by fitting a double-component profile, with the second and broader component being related to the outflowing gas. This interpretation is in agreement with the correlation between the observed star-formation rate surface density (${\Sigma }_{\mathrm{SFR}}$) and the second-component velocity dispersion (${\sigma }_{2nd}$), expected when tracing the feedback component. By modelling the broadband spectra with spectra energy distribution (SED) fitting and obtaining the star-formation histories of the sample, we observe a small decrease in SFR between 100 and 10 Myr in galaxies when the outflow H$\alpha$ luminosity contribution is increased, indicating that the feedback somewhat inhibits the star formation within these timescales. The observed emission-line ratios are best reproduced by photoionization models when compared to shock-ionization, indicating that radiation from young stellar population is dominant, and seems to be a consequence of a continuous star-formation activity instead of a bursty event. The outflow properties such as mass outflow rate ($\sim 0.1$M${}_{\odot }$ yr${}^{-1}$), outflow kinetic power ($\sim 5.2\times 10^{-4}\%L_{\mathrm{bol}}$) and mass loading factor ($\sim 0.12$) point towards a scenario where the measured feedback is not strong and has a low impact on the evolution of galaxies in general.

33 pages, 31 figures, 2 tables, accepted for publication by A&A. Comments are welcome

References in corpus (26)

• Cosmic Star Formation History
• Mass and environment as drivers of galaxy evolution in SDSS and zCOSMOS and the origin of the Schechter function
• Overview of the SDSS-IV MaNGA Survey: Mapping Nearby Galaxies at Apache Point Observatory
• A simple model to interpret the ultraviolet, optical and infrared emission from galaxies
• PyNeb: a new tool for analyzing emission lines. I. Code description and validation of results
• The 2013 Release of Cloudy
• The MUSE Hubble Ultra Deep Field Survey: I. Survey description, data reduction and source detection
• Ionized gas outflows and global kinematics of low-z luminous star forming galaxies
• The SAMI Galaxy Survey: Shocks and Outflows in a normal star-forming galaxy
• The ALPINE-ALMA [CII] survey: Star-formation-driven outflows and circumgalactic enrichment in the early Universe
• SDSS-IV MaNGA: Effects of Morphology in the global and local Star Formation Main Sequences
• The Herschel-ATLAS Data Release 1 Paper II: Multi-wavelength counterparts to submillimetre sources
• A kiloparsec view of a typical star-forming galaxy when the Universe was ~1 Gyr old. Part I. Outflow, halo, and interstellar medium properties
• Physical Processes in Star Formation
• Spatially resolved kinematics, galactic wind, and quenching of star formation in the luminous infrared galaxy IRAS F11506-3851
• Properties of ionized outflows in MaNGA DR2 galaxies
• The PyCASSO database: Spatially resolved stellar population properties for CALIFA galaxies
• Separating Line Emission from Star Formation, Shocks, and AGN Ionisation in NGC 1068
• Incidence, scaling relations and physical conditions of ionised gas outflows in MaNGA
• Simple Yet Powerful: Hot Galactic Outflows Driven by Supernovae
• Outflows in Star-forming Galaxies: Stacking Analyses of Resolved Winds and the Relation to Their Hosts' Properties
• VALES: I. The molecular gas content in star-forming dusty H-ATLAS galaxies up to z=0.35
• A multi-wavelength exploration of the [CII]/IR ratio in H-ATLAS/GAMA galaxies out to z=0.2
• Star formation driven galactic winds in UGC 10043
• The initial mass function of stars and the star-formation rates of galaxies
• A quantitative demonstration that stellar feedback locally regulates galaxy growth

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