Publication: Las relaciones de la formación estelar en galaxias luminosas en el infrarrojo
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2022-11-28
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Universidad Complutense de Madrid
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Abstract
La formación estelar tiene lugar en el interior de densas y frías nubes compuestas principalmente de gas molecular, denominadas nubes moleculares gigantes. Su estudio en galaxias es en la actualidad objeto de gran interés, pues seguimos sin comprender en detalle cuáles son los mecanismos físicos que impulsan la formación de estrellas. Profundizaren este estudio es primordial para entender cómo se forman y evolucionan las galaxias. Los primeros estudios sobre la formación estelar en galaxias encontraron que la relación entre el gas molecular trazado por la molécula de CO y el ritmo al que se forman las estrellas se mantenía constante a lo largo de diferentes poblaciones de galaxias. Estudios más recientes, sin embargo, ponen en duda la existencia de una relación “universal”o “unimodal” válida a todas las escalas espaciales. Sin embargo, el uso de trazadores alternativos del gas molecular, como el HCN y el HCO+, revela relaciones entre el gas y la tasa de formación estelar más fuertes que las que se obtienen usando CO. Por otro lado, observaciones realizadas a escalas espaciales más pequeñas muestran que diferencias en las propiedades del gas dependiendo de la estructura interna de las galaxias(centro, barra, disco) están relacionadas con variaciones en la eficiencia de la formación de estrellas. Estos estudios recientes sugieren que el entorno dinámico de las nubes en las galaxias puede determinar la eficiencia de la formación estelar, resultado que apoya a los modelos turbulentos de formación estelar...
Star formation takes place inside dense and cold clouds composed mainly of molecular gas and known as giant molecular clouds. Its study in galaxies is currently of great interest since we still do not understand the detailed physical mechanisms that drive the formation of stars. Progress in this area is key to understanding how galaxies form and evolve. The first studies of star formation found that the relation between the molecular gas traced by the CO molecule and the rate at which stars form remained constant across different populations of galaxies. More recent studies, however, cast doubt on the existence of a “universal” or “unimodal” relation valid at all spatial scales. In addition, the use of alternative tracers of molecular gas, such as HCN and HCO+, reveals stronger relations between the gas and the star formation rate than those found using CO. Also, observations carried out at smaller spatial scales show that differences in the gas properties depending on the internal structure of the galaxies (center, bar, disk) are correlated with variations in the star-formation efficiency. These recent studies suggest that the dynamical environment of the clouds in galaxies could determine the efficiency of star formation, a result that supports turbulent models...
Star formation takes place inside dense and cold clouds composed mainly of molecular gas and known as giant molecular clouds. Its study in galaxies is currently of great interest since we still do not understand the detailed physical mechanisms that drive the formation of stars. Progress in this area is key to understanding how galaxies form and evolve. The first studies of star formation found that the relation between the molecular gas traced by the CO molecule and the rate at which stars form remained constant across different populations of galaxies. More recent studies, however, cast doubt on the existence of a “universal” or “unimodal” relation valid at all spatial scales. In addition, the use of alternative tracers of molecular gas, such as HCN and HCO+, reveals stronger relations between the gas and the star formation rate than those found using CO. Also, observations carried out at smaller spatial scales show that differences in the gas properties depending on the internal structure of the galaxies (center, bar, disk) are correlated with variations in the star-formation efficiency. These recent studies suggest that the dynamical environment of the clouds in galaxies could determine the efficiency of star formation, a result that supports turbulent models...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Físicas, leída el 08-03-2022