Determinación de propiedades físicas en galaxias cercanas usando espectroscopía 2D
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2025
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Abstract
En este trabajo se estudia la galaxia cercana NGC 5394 a partir de datos espectroscópicos de campo integral obtenidos con los instrumentos MEGARA/IFU y PMAS/PPAK. Se han caracterizado tanto la cinemática estelar como la del gas, así como otras propiedades físicas como la extinción, la tasa de formación estelar, la metalicidad y las poblaciones estelares. Se ha identificado una caída central en la dispersión de velocidades estelares (σ-hole), posiblemente asociada a una barra interna o a un núcleo estelar joven. El análisis del doblete de absorción NaID interestelar ha revelado la presencia de un viento galáctico de gas neutro. Además, se detecta el viento a su vez en el gas ionizado, con la medida de un parámetro de simetría h3 negativo localizado en la región del viento de gas neutro. Por otra parte, la emisión de Hα señala regiones de formación estelar activa tanto en el centro como en los brazos espirales. Estos resultados reflejan una dinámica compleja y un proceso evolutivo influido posiblemente por la interacción con su galaxia compañera NGC 5395, y ponen de manifiesto la capacidad de la espectroscopía 2D para estudiar en detalle la estructura y evolución de galaxias cercanas.
In this work, the nearby galaxy NGC 5394 is studied using integral field spectroscopic data obtained with the MEGARA/IFU and PMAS/PPAK instruments. Both stellar and gas kinematics have been characterized, along with other physical properties such as extinction, star formation rate, metallicity, and stellar populations. A central drop in the stellar velocity dispersion (σ-hole) has been identified, possibly associated with an inner bar or a young stellar nucleus. The analysis of the interstellar NaID absorption doublet has revealed the presence of a galactic wind of neutral gas. Furthermore, the wind is also detected in the ionized gas, through the measurement of a negative h3 symmetry parameter located in the region of the neutral gas wind. Additionally, Hα emission traces regions of active star formation both in the center and in the spiral arms. These results reflect a complex dynamical structure and an evolutionary process likely influenced by the interaction with its companion galaxy NGC 5395, highlighting the power of 2D spectroscopy for detailed studies of the structure and evolution of nearby galaxies.
In this work, the nearby galaxy NGC 5394 is studied using integral field spectroscopic data obtained with the MEGARA/IFU and PMAS/PPAK instruments. Both stellar and gas kinematics have been characterized, along with other physical properties such as extinction, star formation rate, metallicity, and stellar populations. A central drop in the stellar velocity dispersion (σ-hole) has been identified, possibly associated with an inner bar or a young stellar nucleus. The analysis of the interstellar NaID absorption doublet has revealed the presence of a galactic wind of neutral gas. Furthermore, the wind is also detected in the ionized gas, through the measurement of a negative h3 symmetry parameter located in the region of the neutral gas wind. Additionally, Hα emission traces regions of active star formation both in the center and in the spiral arms. These results reflect a complex dynamical structure and an evolutionary process likely influenced by the interaction with its companion galaxy NGC 5395, highlighting the power of 2D spectroscopy for detailed studies of the structure and evolution of nearby galaxies.












