The CHIMERA Survey: The first CO detection in Leo T, the lowest mass known galaxy still hosting cold molecular gas

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dc.article.numberL11
dc.catalogadorvzp
dc.contributor.authorVillanueva, Vicente
dc.contributor.authorBlaña Díaz, Matías
dc.contributor.authorBolatto, Alberto D.
dc.contributor.authorRubio, Mónica
dc.contributor.authorTarantino, Elizabeth
dc.contributor.authorHerrera Camus, Rodrigo Ignacio
dc.contributor.authorBurkert, Andreas
dc.contributor.authorVaz, Daniel
dc.contributor.authorRead, Justin I.
dc.contributor.authorGalaz Lladser, Gaspar
dc.contributor.authorMuñoz, César
dc.contributor.authorCalderón Espinoza, Diego Nicolas
dc.contributor.authorBehrendt, Manuel
dc.contributor.authorCarballo Bello, Julio A.
dc.contributor.authorGray, Emily
dc.contributor.authorFellhauer, Michael
dc.date.accessioned2025-08-26T15:52:54Z
dc.date.available2025-08-26T15:52:54Z
dc.date.issued2025
dc.description.abstractWe report the first CO detection in Leo T, representing the most extreme observation of carbon monoxide molecules in the lowest stellar mass gas-rich dwarf galaxy (M⋆ ∼ 105 M⊙) known to date. We acquired and present new Atacama Compact Array (ACA) 12CO(J = 1–0) data within our CHIMERA Survey project for the central region of Leo T, a metal-poor ([M/H] ∼ ‑1.7) dwarf in the Milky Way (MW) outskirts. We identified three compact molecular clouds (< 13 pc) with estimated upper limit virial masses of Mmol ∼ 5 × 103 M⊙ each and a total of 1.4 ± 0.4 × 104 M⊙, corresponding to ∼3% of the total gas mass. We obtained CO-to-H2 conversion factors (αCO) as high as ∼ 155 M⊙(K km s‑1 pc2)‑1 and mean molecular gas surface densities of Σmol ∼ 9 M⊙ pc‑2 that are consistent with values found in dwarf galaxies with extremely low metal content. All CO clouds are shifted (∼60 pc) from the stellar population centers, and only one cloud appears within the densest HI region. Two clouds have velocity offsets with the HI of Δvlos ∼ + 13 km s‑1 being within twice the velocity dispersion (Δvlos/σHI, los ∼ 2) and probably bound. However, the northern cloud is faster (Δvlos ∼ + 57 km s‑1); our models with low halo masses (Mh ≲ 109 M⊙) result in unbound orbits, suggesting that this material is likely being expelled from the dwarf, providing evidence for molecular gas depletion. These properties reveal a perturbed dynamics intertwined with star formation processes in low-mass dwarf galaxies, supporting a scenario of episodic bursts until they are fully quenched by the MW environment....
dc.fechaingreso.objetodigital2025-08-27
dc.format.extent8 páginas
dc.fuente.origenORCID
dc.identifier.doi10.1051/0004-6361/202555635
dc.identifier.eissn1432-0746
dc.identifier.issn0004-6361
dc.identifier.urihttps://doi.org/10.1051/0004-6361/202555635
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/105282
dc.information.autorucInstituto de Astrofísica; Calderon Espinoza, Diego Nicolas; 0000-0002-9019-9951; 224673
dc.information.autorucInstituto de Astrofísica; Blaña Díaz, Matías; 0000-0003-2139-0944; 1214064
dc.information.autorucInstituto de Astrofísica; Galaz Lladser Gaspar; 0000-0002-8835-0739; 1000955
dc.information.autorucInstituto de Física; Herrera Camus, Rodrigo Ignacio; 0000-0002-2775-0595; 131178
dc.information.autorucInstituto de Astrofísica; Calderón Espinoza, Diego Nicolas; 0000-0002-9019-9951; 224673
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaAstronomy & Astrophysics
dc.rightsacceso abierto
dc.rights.licenseAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGalaxies dwarf
dc.subjectGalaxies evolution
dc.subjectGalaxies ISM
dc.subjectLocal Group
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleThe CHIMERA Survey: The first CO detection in Leo T, the lowest mass known galaxy still hosting cold molecular gas
dc.typeartículo
dc.volumen699
sipa.codpersvinculados224673
sipa.codpersvinculados1214064
sipa.codpersvinculados1000955
sipa.codpersvinculados131178
sipa.trazabilidadORCID;2025-08-22
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