Molecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon

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dc.article.numberA215
dc.catalogadoraba
dc.contributor.authorCatán Valenzuela, Victoria Sofia
dc.contributor.authorGonzález López, Jorge
dc.contributor.authorSolimano Gambardella, Manuel Antonio
dc.contributor.authorBarrientos, Luis Felipe
dc.contributor.authorAfruni, A.
dc.contributor.authorAravena, M.
dc.contributor.authorBayliss, M.
dc.contributor.authorHernández, J. A.
dc.contributor.authorLedoux, C.
dc.contributor.authorMahler, G.
dc.contributor.authorSharon, K.
dc.contributor.authorTejos, N.
dc.date.accessioned2025-04-01T12:58:51Z
dc.date.available2025-04-01T12:58:51Z
dc.date.issued2024
dc.description.abstractAims. The aim of this study is to investigate the molecular gas content of strongly magnified low-mass star-forming galaxies (SFGs) around the cosmic noon period (z ∼ 2) through observations of carbon monoxide (CO) emission lines and dust continuum emission, both of which serve as tracers of molecular gas (H2). Methods. We observed 12 strongly lensed arcs with the Atacama Compact Array (ACA) to detect CO mid-J rotational transitions and dust continuum. Thanks to the strong lensing, we were able to probe the previously understudied low-mass regime. With a compiled set of observations, we recalibrated empirical relations between star formation rate density (ΣSFR) and the CO line ratios. We derived galaxy properties using spectral energy distribution fitting (SED). We also performed galaxy stacking to combine faint signals. In all cases, molecular gas masses were estimated using both tracers. Results. We detected CO emission in 3 of the 12 arcs and dust continuum emission in another 3. The obtained H2 masses indicate that most of these galaxies (M* < 1010.7 M⊙) have lower molecular gas fractions and shorter depletion times compared to expectations from established scaling relations at these redshifts. We explored several possible explanations for this gas deficit, including uncertainties in mass estimates, effects of low-metallicity environments, larger atomic gas reservoirs in low-mass systems, and the possibility that these represent low-mass analogs of main sequence starburst (MS SBs) galaxies that are undergoing sustained star formation due to gas compaction despite low overall gas fractions. Conclusions. We conclude that these mass and metallicity regimes present a molecular gas deficit. Our results suggest that this deficit is likely due to a significant amount of atomic gas, which our stacking indicates is about 91% of the total gas. However, this estimation might be an upper limit, as the possibility remains that our galaxies contain CO-dark gas.
dc.format.extent15 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1051/0004-6361/202451892
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202451892
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/103057
dc.identifier.wosidWOS:001441922300025
dc.information.autorucInstituto de Astrofísica; Catán Valenzuela Victoria Sofia; S/I; 1086670
dc.information.autorucInstituto de Astrofísica; González López, Jorge; S/I; 154597
dc.information.autorucInstituto de Astrofísica; Barrientos, Luis Felipe; 0000-0003-0151-0718; 102167
dc.information.autorucInstituto de Astrofísica; Solimano Gambardella, Manuel Antonio; S/I; 1025613
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaAstronomy and Astrophysics
dc.rightsacceso abierto
dc.rights.licenseAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGravitational lensing: strong
dc.subjectGalaxies: evolution
dc.subjectGalaxies: high-redshift
dc.subjectGalaxies: star formation
dc.subjectSubmillimeter: galaxies
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleMolecular gas budget of strongly magnified low-mass star-forming galaxies at cosmic noon
dc.typeartículo
sipa.codpersvinculados1086670
sipa.codpersvinculados154597
sipa.codpersvinculados102167
sipa.codpersvinculados1025613
sipa.trazabilidadORCID;2025-03-03
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