Subvenciones relacionadas:
General
El objetivo básico del proyecto es investigar la evolución de las galaxias mediante el entendimiento de la interacción del medio interestelar y las estrellas. La técnica principal que utilizamos es la cinemática bidimensional de galaxias enteras observada por nuestro instrumento GHaFaS, un interferometro Fabry Perot en el telescopio William Herschel del ORM. Combinamos los datos de GHaFaS con imágenes fotométricas propias, con ACAM en el mismo telescopio, con una variedad de fuentesde imágenes en el infrarrojo y el ultravioleta, y con mapas de líneas de emisión en los rangos de radio y milimétrico para explorar los efectos, y los parámetros físicos que determinen el ritmo de formación y la función de masas de las estrellas según la localización de su formación en las galaxias.
En la fase actual del proyecto, los aspectos dinámicos que estamos explorando son básicamente dos: la estructura resonante de los discos y las barras, y los efectos de las zonas de formación de estrellas masivas en su entorno mediante los vientos estelares y las supernovas. Además, en preparación para la exploración de la formación de las galaxias en épocas anteriores, estamos estudiando como las interacciones entre galaxias estimulan y condicionan la formación estelar en ellas antes de su fusión. En el futuro los trabajos se extenderán, lógicamente, en dos direcciones: hacia fuera a galaxias con z creciente, y “hacia dentro” al aplicar nuestra metodología al estudio de los procesos interestelares en las zonas de formación de estrellas masivas en la galaxia M33 del grupo local.
Acoplado al estudio cinemático, estamos trabajando en aspectos de la evolución de los discos de las galaxias en la base de observaciones con precisión de sus perfiles de brillo superficial, tanto en el universo local como en redshift intermedio. Con la finalidad de avanzar el proyecto en esta dirección estamos colaborando con colegas en el Instituto de Astronomía de la UNAM (México) y del Laboratoire d'Astrophysique de Marseille (Francia) en la implementación de un nuevo instrumento, NEFER, que será un módulo Fabry-Perot de alta resolución incorporado en OSIRIS en el GTC. Hicimos pruebas iniciales exitosas en diciembre de 2017. En Marzo 2018 comisionamos el instrumento para su uso en el telescopio.
Miembros
Resultados
- Se comprobó que el método "Font-Beckman" de analizar las resonancias en galaxias da resultados muy precisos, comparándolos con el método "Tremaine-Weinberg" con datos de GHaFAS (WHT) y MUSE (VLT)
- Los perfiles de galaxias S0 de tipo III (antitruncadas) se midieron por primera vez a z = 0.6 (hace 5 mil millones de años). El radio de la "rotura" resulta igual que en las galaxias locales, aun con un brillo superficial 1.5 magnitudes mayor
- Un nuevo, y muy mejorado analisis del "Campo Ultraprofundo del Hubble" produjo una imagen con fotometría válida hasta 33 magnitudes por segundo de arco cuadrado, revelando las afueras de muchas galaxias
- Comparando galaxias en pares interactivas con galaxias aisladas, se comprobó que el ritmo de formación estelar es mayor en las primeras, y que este aumento is común a los discos y las colas de marea.
- La galaxia NGC 864, (CIG 96) aparentemente aislada, muestra una asimetría en la distribución del HI. Se mostró que la galaxia es aislada de verdad, y que acrecimiento de HI puede explicar la asimetría además de la formación estelar reciente en su pseudo-anillo estelar
Actividad científica
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Interlocking Resonance Patterns in Galaxy DisksWe have developed a method for finding dynamical resonances in disk galaxies using the change in sense of the radial component of the in-plane velocity at a resonance radius. Using simulations we show that we would expect to find these changes at corotation radii with a weaker effect at the Lindblad resonances. The method works well withQuerejeta, M. et al.
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Hα kinematics of 11 starburst galaxies selected from the Sloan Digital Sky SurveyWe present analysis of Fabry-Perot interferometric observations for a sample of 11 starburst galaxies with redshift z ≲ 0.03 selected from the Sloan Digital Sky Survey. We have targeted the Hα λ 6562.78 emission line at spatial sampling of 0.2arcsec-0.4 arcsec and at spectral resolution of R ˜ 16 000. Studying two-dimensional maps for the velocityBlasco-Herrera, J. et al.
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112013 -
Electron densities of HII regions throughout the NGC 6946 diskWe have used the tuneable filter system of OSIRIS to observe the [SII] doublet lines at λλ617.7 and 673.1 nm in emission across the full face of NGC 6946, and estimated the in situ electron densities for 387 HII regions, so far. The values decline steadily from over 350 cm^-3 at 1/3 R_{25} to around 175 cm^-3 at 2/3 R_{25}.Beckman, J. E. et al.
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Kinematics of Arp 270: gas flows, nuclear activity and two regimes of star formationWe have observed the Arp 270 system (NGC 3395 and NGC 3396) in Hα emission using the Galaxy Hα Fabry-Perot spectrometer on the 4.2 m William Herschel Telescope (La Palma). In NGC 3396, which is edge-on to us, we detect gas inflow towards the centre, and also axially confined opposed outflows, characteristic of galactic superwinds, and we go on toZaragoza-Cardiel, J. et al.
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Statistical studies of HII regions in nearby galaxies. I. Spitzer near-IR luminosities and temperatures, compared with Hα luminosities, from selected HII regions in M100Aims: We systematically study the relations between the Hα luminosity and the near-IR luminosity and temperature of a set of selected HII regions in the disc of M100. Methods: By using the technique of cross-reference between the optical Hα image (the catalogue of HII regions in M100) and the Spitzer IRAC images, we locate the selected HII regionsChan, S. J. et al.
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