Browsing by Author "Carballo Bello, Julio A."

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    Near-infrared photometry and spectroscopy of the low Galactic latitude globular cluster 2MASS-GC 03
    (2016) Carballo Bello, Julio A.; Ramírez Alegría, S.; Borissova, J.; Smith, L. C.; Kurtev, R.; Lucas, P. W.; Moni Bidin, Ch.; Alonso García, J.; Minniti, D.; Palma, T.; Dekany, Istvan
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    Tails and streams around the galactic globular clusters NGC1851, NGC1904, NGC2298 and NGC2808
    (2018) Carballo Bello, Julio A.; Martínez Delgado, David; Navarrete Silva, Camila Andrea; Catelan, Márcio; Muñoz, Ricardo R.; Antoja, Teresa; Sollima, Antonio
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    The CHIMERA Survey: The first CO detection in Leo T, the lowest mass known galaxy still hosting cold molecular gas
    (2025) Villanueva, Vicente; Blaña Díaz, Matías; Bolatto, Alberto D.; Rubio, Mónica; Tarantino, Elizabeth; Herrera Camus, Rodrigo Ignacio; Burkert, Andreas; Vaz, Daniel; Read, Justin I.; Galaz Lladser, Gaspar; Muñoz, César; Calderón Espinoza, Diego Nicolas; Behrendt, Manuel; Carballo Bello, Julio A.; Gray, Emily; Fellhauer, Michael
    We 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....