Star-formation driven outflows in local dwarf galaxies as revealed from [CII] observations by Herschel

Abstract

We characterize the physical properties of star-formation driven outflows in a sample of 29 local dwarf galaxies drawn from the Dwarf Galaxy Survey. We make use of Herschel/PACS archival data to search for atomic outflow signatures in the wings of individual [CII] 158 um spectra and in their stacked line profile. We find a clear excess of emission in the high-velocity tails of 11 sources which can be explained with an additional broad component in the modeling of their spectra. The remaining objects are likely hosts of weaker outflows that can still be detected in the average stacked spectrum. In both cases, we estimate the atomic mass outflow rates which result to be comparable with the star-formation rates of the galaxies, implying mass-loading factors of the order of unity. Outflow velocities in all the 11 galaxies with individual detection are larger than (or compatible with) the escape velocities of their dark matter halos, with an average fraction of 40% of gas escaping into the intergalactic medium (IGM). Depletion timescales due to outflows are lower than those due to gas consumption by star formation in most of our sources, ranging from hundred million to a few billion years. Our outflows are mostly consistent with momentum-driven winds generated by the radiation pressure of young stellar populations on dust grains, although the energy-driven scenario is not excluded if considering a coupling efficiency up to 20% between the energy injected by supernova (SN) and the interstellar medium. Our results suggest that galactic outflows can regulate the star formation history of dwarf galaxies as they are able to enrich with metals the circumgalactic medium of these sources, bringing on average a non-negligible amount of gas into the IGM. Our findings are suitable for tuning chemical evolution models attempting to describe the physical processes shaping the evolution of dwarf galaxies.

Accepted for publication in A&A

References in corpus (49)

• Cosmic Star Formation History
• The EAGLE project: Simulating the evolution and assembly of galaxies and their environments
• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• Star Formation in AEGIS Field Galaxies since z=1.1 : The Dominance of Gradually Declining Star Formation, and the Main Sequence of Star-Forming Galaxies
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• A Semi-Analytic Model for the Co-evolution of Galaxies, Black Holes, and Active Galactic Nuclei
• The Circumgalactic Medium
• Kiloparsec-scale outflows are prevalent among luminous AGN: outflows and feedback in the context of the overall AGN population
• Wind from the black-hole accretion disk driving a molecular outflow in an active galaxy
• The Mass-Metallicity and the Fundamental Metallicity Relation revisited on a fully Te-based abundance scale for galaxies
• The Cosmic Baryon and Metal Cycles
• A z=0 Multi-wavelength Galaxy Synthesis I: A WISE and GALEX Atlas of Local Galaxies
• The Current Status of Galaxy Formation
• The Herschel Dwarf Galaxy Survey: I. Properties of the low-metallicity ISM from PACS spectroscopy
• Ionized gas outflows and global kinematics of low-z luminous star forming galaxies
• Very extended cold gas, star formation and outflows in the halo of a bright QSO at z>6
• Dynamics of Dusty Radiation Pressure Driven Shells and Clouds: Fast Outflows from Galaxies, Star Clusters, Massive Stars, and AGN
• The ALPINE-ALMA [CII] survey: Star-formation-driven outflows and circumgalactic enrichment in the early Universe
• Superbubbles in the Multiphase ISM and the Loading of Galactic Winds
• Molecular outflows in local ULIRGs: energetics from multi-transition OH analysis
• Quasar-Mode Feedback in Nearby Type 1 Quasars: Ubiquitous Kiloparsec-Scale Outflows and Correlations with Black Hole Properties
• Molecular outflows in local galaxies: Method comparison and a role of intermittent AGN driving
• High star formation rates as the origin of turbulence in early and modern disk galaxies
• A Herschel [CII] Galactic plane survey III: [CII] as a tracer of star formation
• The Herschel Dwarf Galaxy Survey: II. Physical conditions, origin of [CII] emission, and porosity of the multiphase low-metallicity ISM
• Pressure-Regulated, Feedback-Modulated Star Formation In Disk Galaxies
• Large turbulent reservoirs of cold molecular gas around high-redshift starburst galaxies
• The VANDELS ESO public spectroscopic survey: final Data Release of 2087 spectra and spectroscopic measurements
• Relations Between the Sizes of Galaxies and their Dark Matter Halos at Redshifts $0<z<3$
• CLASSY III: The Properties of Starburst-Driven Warm Ionized Outflows
• Feedback in low-mass galaxies in the early Universe
• Shaken, not blown: the gentle baryonic feedback of nearby starburst dwarf galaxies
• Being KLEVER at cosmic noon: ionised gas outflows are inconspicuous in low-mass star-forming galaxies but prominent in massive AGN hosts
• Low-redshift compact star-forming galaxies as analogues of high-redshift star-forming galaxies
• The ALPINE-ALMA [CII] survey: The contribution of major mergers to the galaxy mass assembly at z~5
• The gas, metal and dust evolution in low-metallicity local and high-redshift galaxies
• INFERNO: Galactic winds in dwarf galaxies with star-by-star simulations including runaway stars
• The Production of Cold Gas Within Galaxy Outflows
• AGN feedback in a galaxy merger: Multi-phase, galaxy-scale outflows including a fast molecular gas blob ~6 kpc away from IRAS F08572+3915
• The impact of Stellar feedback from velocity-dependent ionised gas maps. -- A MUSE view of Haro 11
• Quantifying the energetics of molecular superbubbles in PHANGS galaxies
• A near-infrared study of the multi-phase outflow in the type-2 quasar J1509+0434
• Spectrophotometric investigations of Blue Compact Dwarf Galaxies: Markarian 35
• Osaka Feedback Model II: Modeling Supernova Feedback Based on High-Resolution Simulations
• The SAMI Galaxy Survey: the drivers of gas and stellar metallicity differences in galaxies
• An extended [CII] halo around a massive star-forming galaxy at z = 5.3
• IR SED and Dust Masses of Sub-solar Metallicity Galaxies at z~2.3
• The ALPINE-ALMA [CII] Survey: the population of [CII]-undetected galaxies and their role in the ${\mathrm{L}}_{[\mathrm{CII}]}$-SFR relation
• Properties of the interstellar medium in star-forming galaxies at redshifts 2 < z < 5 from the VANDELS survey

Cited by in corpus (14)

• Exploring the nature of dark matter with the extreme galaxy AGC 114905
• The ALMA-CRISTAL Survey: Spatial extent of [CII] line emission in star-forming galaxies at $z=4-6$
• Evidence of extended [CII] and dust emission in local dwarf galaxies
• The ALMA-ALPINE [CII] survey: sub-kpc morphology of 3 main-sequence galaxy systems at z~4.5 revealed by ALMA
• Carbon envelopes around merging galaxies at z ~ 4.5
• Tracing the evolutionary pathways of dust and cold gas in high-z quiescent galaxies with SIMBA
• MaNGA AGN dwarf galaxies (MAD) -- II. AGN outflows in dwarf galaxies
• The ALPINE-ALMA [CII] Survey: Unveiling the baryon evolution in the ISM of $z\sim 5$ star-forming galaxies
• IFUM Integrated Field Spectroscopy of Ten M104 Satellite Galaxy Candidates
• MIGHTEE-HI: The star-forming properties of HI selected galaxies
• The ionization structure and chemical history in isolated H II regions of dwarf galaxies with IFU I. The Sagittarius Dwarf Irregular Galaxy
• Nearby dwarf galaxies with extreme star formation rates: a window into dwarf-galaxy evolution in the early Universe
• On the Origins of "Hostless'' Supernovae: Testing the Faint-end Galaxy Luminosity Function and Supernova Progenitors with Events in Dwarf Galaxies
• Higher resolution optical spectra of $M_{\ast }<10^{10}{M}_{\odot }$ galaxies reveal outflow signatures unresolved by the SDSS