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Título : | Molecular gas properties of Q1700-MD94: a massive, main-sequence galaxy at z ≈ 2 = Propiedades del gas molecular de Q1700-MD94: Una galaxia masiva y de sequencia principal a z ≈ 2 |
Otros títulos : | Propiedades del gas molecular de Q1700-MD94: Una galaxia masiva y de sequencia principal a z ≈ 2. |
Autor : | Herrera Camus, Rodrigo; supervisor de grado Henríquez Brocal, Katherine |
Palabras clave : | Estrellas Supergigantes;Formación;Líneas Espectrales;Estrellas Supergigantes;Formación;Líneas Espectrales |
Fecha de publicación : | 2021 |
Editorial : | Universidad de Concepción. |
Resumen : | We use a combination of new NOrthern Extended Millimeter Array (NOEMA) observations of the pair of [CI] transitions, the CO(7-6) line, and the dust continuum, in addition to ancillary CO(1-0) and CO(3-2) data, to study the molecular gas properties of Q1700-MD94, a massive, main-sequence galaxy at z ≈ 2. We find that for a reasonable set of assumptions for a typical massive star-forming galaxy, the CO(1-0), the [CI](1-0) and the dust continuum yield molecular gas masses that are consistent within a factor of ∼ 2. The global excitation properties of the molecular gas as traced by the [CI] and CO transitions are similar to those observed in other massive, star-forming galaxies at z ∼ 2. Our large velocity gradient (LVG) modeling using RADEX of the CO and [CI] spectral line energy distributions (SLEDs) suggests the presence of low-excitation (Tkin = 34 K, nH2 = 3.1 × 103 cm−3 ) and high-excitation (Tkin = 137 K, nH2 = 1.6 × 104 cm−3 ) molecular gas components. While the former is re sponsible for the bulk of the [CI](1-0) and [CI](2-1) line emission, the later dominates the CO line emission at J & 4. The galaxy size in the CO(1-0) and CO(7-6) line emission are comparable, which suggests that the highly-excited molecular gas is distributed throughout the disk powered by intense star formation activity. To confirm this scenario will require spatially resolved observations of the CO and [CI] lines which can now be obtained with NOEMA upgraded capabilities. |
Descripción : | Tesis para optar al grado académico de Magíster en Astronomía. |
URI : | http://repositorio.udec.cl/jspui/handle/11594/9204 |
Aparece en las colecciones: | Astronomía - Tesis de Magister |
Ficheros en este ítem:
Fichero | Descripción | Tamaño | Formato | |
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Tesis Molecular gas properties.Image.Marked.pdf | 1,43 MB | Adobe PDF | Visualizar/Abrir |
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