Shaken, but not expelled: Gentle baryonic feedback from nearby starburst dwarf galaxies

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dc.contributor.authorMarasco, A.
dc.contributor.authorBelfiore, F.
dc.contributor.authorCresci, G.
dc.contributor.authorLelli, F.
dc.contributor.authorVenturi, G.
dc.contributor.authorHunt, L. K.
dc.contributor.authorConcas, A.
dc.contributor.authorMarconi, A.
dc.contributor.authorMannucci, F.
dc.contributor.authorMingozzi, M.
dc.contributor.authorMcLeod, A. F.
dc.contributor.authorKumari, N.
dc.contributor.authorCarniani, S.
dc.contributor.authorVanzi, L.
dc.contributor.authorGinolfi, M.
dc.date.accessioned2025-01-20T20:16:55Z
dc.date.available2025-01-20T20:16:55Z
dc.date.issued2023
dc.description.abstractBaryonic feedback is expected to play a key role in regulating the star formation of low-mass galaxies by producing galaxy-scale winds associated with mass-loading factors of beta similar to 1-50. We test this prediction using a sample of 19 nearby systems with stellar masses of 10(7) M-star/M-circle dot < 10(10), mostly lying above the main sequence of star-forming galaxies. We used MUSE at VLT optical integral field spectroscopy to study the warm ionised gas kinematics of these galaxies via a detailed modelling of their H alpha emission line. The ionised gas is characterised by irregular velocity fields, indicating the presence of non-circular motions of a few tens of km s(-1) within galaxy discs, but with intrinsic velocity dispersion of 40-60 km s(-1) that are only marginally larger than those measured in main-sequence galaxies. Galactic winds, defined as gas at velocities larger than the galaxy escape speed, encompass only a few percent of the observed fluxes. Mass outflow rates and loading factors are strongly dependent on M-star, the star formation rate (SFR), SFR surface density, and specific SFR (sSFR). For M-star of 10(8) M-circle dot we find beta similar or equal to 0.02, which is more than two orders of magnitude smaller than the values predicted by theoretical models of galaxy evolution. In our galaxy sample, baryonic feedback stimulates a gentle gas cycle rather than causing a large-scale blow-out.
dc.fuente.origenWOS
dc.identifier.doi10.1051/0004-6361/202244895
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202244895
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/92362
dc.identifier.wosidWOS:000937069300004
dc.language.isoen
dc.revistaAstronomy & astrophysics
dc.rightsacceso restringido
dc.subjectgalaxies: dwarf
dc.subjectgalaxies: irregular
dc.subjectgalaxies: starburst
dc.subjectISM: jets and outflows
dc.subjectISM: kinematics and dynamics
dc.titleShaken, but not expelled: Gentle baryonic feedback from nearby starburst dwarf galaxies
dc.typeartículo
dc.volumen670
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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